Preparing and Filing a Provisional Patent Application: A Practical Guide

Summary. This guide walks an inventor, a startup, or the lawyer advising them through a provisional patent application from the first conversation to the conversion deadline twelve months later. It begins with the decisions to make before drafting: whether to patent at all, whether a provisional is the right vehicle, and what event sets the real deadline. The numbered steps cover controlling disclosures, securing ownership and identifying inventors, running an invention capture session, drafting a specification and figures that will support later claims, optional claims, entity status and fees, the cover sheet, filing through Patent Center, the foreign filing license, and the year of follow-up work that ends in a nonprovisional, PCT, or deliberate lapse. A separate step shows a challenger how to audit a provisional priority claim. A timeline and cost table, an extended worked example involving a marine robotics startup, common mistakes, an FAQ, and takeaways close the guide.

Marisol Vance runs a nine-person company in Portland, Maine, called Tidewell Robotics. Its robot crawls along the nets of offshore salmon pens and blasts off algae and mussels with low-pressure cavitation jets, so farmers do not have to haul the nets out of the water. On a Monday in early spring she learns three things. A Norwegian aquaculture fair has offered Tidewell a speaking slot in five weeks. A seed investor wants to see the robot working in a test tank. And her lead software engineer, Ken Abernathy, has just figured out how to make the robot map a net's tears from the vibration of its own treads, which no one else seems to do.

She asks counsel the obvious question: can we file something before the fair? The answer is yes. A provisional application can be on file within days. The better answer is that the five weeks should be used to write a provisional that will still be worth something in three years, when someone with a reason to attack it reads it line by line. This guide shows how.

The doctrine behind each step is explained in Provisional Patent Applications: What They Protect, What They Do Not, and How to Keep the Priority Date. This guide is the procedure.

The short answer

• Find the real deadline first. It is the earliest public disclosure, commercial offer, or foreign event, not the date someone suggests. File before it.
• Paper ownership before you file. Get present-tense assignments from every contributor and identify inventors claim by claim, or at least feature by feature.
• Capture before you draft. A structured interview with the inventors produces the alternatives, ranges, and failure modes that make a provisional support broad claims.
• Write a complete specification. Describe structure and operation, not benefits; give alternatives for every element; draw every feature you may claim; include draft claims.
• File through Patent Center with a correct cover sheet and entity status. Check the filing receipt for the foreign filing license and the right date.
• Use the year, and calendar it. Decide by month nine, file follow-up provisionals for improvements, and file the nonprovisional and any PCT application by month eleven. The twelve-month deadline cannot be extended.

Before you start: five decisions

1. Patent, trade secret, or both?

A patent requires public disclosure in exchange for twenty years of exclusivity. A trade secret lasts as long as the secret holds and reasonable measures protect it, under 18 U.S.C. § 1839(3). Features a competitor can see by buying the product (a robot's tread geometry) are poor trade secrets. Features hidden inside a server (Ken's vibration-mapping model weights) may be better kept secret. The Supreme Court has recognized for decades that the two regimes coexist, Kewanee Oil Co. v. Bicron Corp., 416 U.S. 470 (1974), and a provisional preserves the choice for a year because it is never published on its own. For the trade secret side, see Building a Trade Secret Protection Program from Scratch.

2. Provisional or nonprovisional?

A provisional is not a cheaper version of a nonprovisional; it is a different tool. A provisional prepared to nonprovisional quality, minus formal claims, costs less than a nonprovisional but more than a placeholder, and it is the version this guide describes.

3. Who will draft and file?

Inventors may file their own applications. Only registered practitioners may represent others before the Office, under 37 C.F.R. part 11. A company that has its in-house engineer file for it, without a registered practitioner, should name the company as applicant and have the engineer sign only as an officer, or have a practitioner file. A self-filed provisional before a disclosure beats no filing at all, but it is not a substitute for a careful one.

4. Does the government have an interest?

If federal funds supported the work (an SBIR or STTR grant, a university lab, a government contract), Bayh-Dole obligations apply. 35 U.S.C. § 202(c) requires disclosure to the funding agency, election of title, and filing within set periods, and the application must contain a government interest statement. Missing these deadlines can forfeit title to the government. See University Technology Transfer and Bayh-Dole: Who Owns Federally Funded Inventions.

5. Where will you want patents?

If foreign protection is possible, the provisional must be filed before any public disclosure, because most countries have no grace period comparable to 35 U.S.C. § 102(b)(1). The foreign deadline (twelve months for Paris Convention and PCT priority) also cannot be extended by the domestic restoration rule. See International Patent Filing: The PCT, Paris Priority, National Phase, and Foreign Prosecution.

Step 1: Fix the deadline and control disclosures

What to do. List every event that might disclose the invention or offer it for sale: conference talks, trade shows, investor pitches, demo days, customer pilots, quotes, website updates, social media, academic papers, theses, grant reports, open-source releases, and product shipments. Pick the earliest. That is the filing deadline. Then adopt a short pre-filing disclosure rule: nothing about the invention leaves the company except under a signed nondisclosure agreement, and nothing goes to a public audience until counsel confirms the provisional is on file and covers what will be shown.

Why. Under 35 U.S.C. § 102(a)(1), a public disclosure before the effective filing date is prior art unless an exception applies. The inventor's own disclosure is excepted for one year in the United States, but not in Europe, China, or most other jurisdictions. A commercial offer for sale of an invention that is ready for patenting triggers the on-sale bar, Pfaff v. Wells Electronics, Inc., 525 U.S. 55 (1998), and a confidential sale still counts, Helsinn Healthcare S.A. v. Teva Pharmaceuticals USA, Inc., 586 U.S. 123 (2019).

Pitfalls. Investor decks and demo videos posted online. Conference abstracts, which are often published weeks before the talk. Posters, which can be printed publications even without handouts, In re Klopfenstein, 380 F.3d 1345 (Fed. Cir. 2004). Theses deposited in a library, In re Hall, 781 F.2d 897 (Fed. Cir. 1986). Pasting technical details into consumer AI tools whose terms permit training or human review; see Building a Generative AI Use Policy That Protects Trade Secrets: A Practical Guide.

Timing. Day one of the engagement. If the disclosure is less than a week away, consider postponing it or narrowing what will be shown.

Cost. Negligible. A one-page disclosure rule and a standard NDA are enough. For NDA drafting, see Drafting Enforceable Non-Disclosure Agreements for Technology Transactions.

Step 2: Secure ownership and identify inventors

What to do. Identify everyone who may have contributed to the conception of any feature that may be claimed: founders, employees, contractors, university collaborators, customers who suggested features, and advisors. For each, confirm a signed agreement that presently assigns inventions ("hereby assigns"), or obtain a specific assignment of the invention now. Record, feature by feature, who conceived what.

Why. Rights start with the inventor. An employer or startup owns an invention only through a valid assignment, Board of Trustees of Leland Stanford Junior University v. Roche Molecular Systems, Inc., 563 U.S. 776 (2011). A present assignment of future inventions transfers legal title automatically when the invention is made, FilmTec Corp. v. Allied-Signal Inc., 939 F.2d 1568 (Fed. Cir. 1991); a promise to assign does not, and even policy language stating that inventions "shall be the property" of an institution may not be a present assignment, Omni MedSci, Inc. v. Apple Inc., 7 F.4th 1148 (Fed. Cir. 2021). Recording assignments with the Office protects against later purchasers under 35 U.S.C. § 261.

Inventorship is a legal question about conception. Conception is "the formation in the mind of the inventor, of a definite and permanent idea of the complete and operative invention," Burroughs Wellcome Co. v. Barr Laboratories, Inc., 40 F.3d 1223 (Fed. Cir. 1994). Joint inventors need not contribute equally or to every claim, 35 U.S.C. § 116(a); a contribution to the conception of one claim is enough, Ethicon, Inc. v. United States Surgical Corp., 135 F.3d 1456 (Fed. Cir. 1998), provided it is not insignificant measured against the full invention and is more than explaining well-known concepts, Pannu v. Iolab Corp., 155 F.3d 1344 (Fed. Cir. 1998). Only natural persons can be inventors, Thaler v. Vidal, 43 F.4th 1207 (Fed. Cir. 2022).

Pitfalls. Contractors without IP clauses. University collaborators bound by the university's policy. Founders who worked on the idea at a prior employer, which may claim it under that employer's agreement. A cofounder who has left on bad terms. The provisional's inventor list matters because 35 U.S.C. § 119(e)(1) requires at least one inventor in common between the provisional and the nonprovisional. Errors can be corrected under 37 C.F.R. § 1.48 (and, after issuance, 35 U.S.C. § 256), but a missing assignment cannot be corrected without the inventor's cooperation.

Timing. Before filing. An assignment signed after a dispute begins is expensive or unavailable.

Cost. Low for current employees with good agreements; potentially significant for departed contributors or prior-employer claims. Assignment drafting is covered in Employee Invention Assignment Agreements: Drafting for Enforceability Across Jurisdictions, and ownership disputes in Patent Ownership, Assignments, and Standing: Chain-of-Title Problems That Sink Cases.

Step 3: Run an invention capture session

What to do. Collect what exists (sketches, CAD files, code, test data, lab notebooks, prior decks, internal emails), then interview the inventors for sixty to ninety minutes per major feature. The interview should answer, for each feature:

1. What problem does it solve, and how did people solve it before?
2. What are the parts, how are they connected, and how do they move or interact?
3. What are the steps, in order, and which order matters?
4. What alternatives did you consider, build, or reject, and why?
5. What ranges work (dimensions, frequencies, temperatures, concentrations, thresholds), and what is the preferred value?
6. What fails, and what happens at the edges of the ranges?
7. What could a competitor change to get the same result without copying exactly?
8. What will the next version look like?
9. Who thought of each piece, and when?

Why. The provisional must show possession of everything the company will later claim, and must enable it. Question 7 is the most important. It produces the alternatives that let a later claim cover a design-around. A provisional that describes only the prototype supports claims only to the prototype. See Ariad Pharmaceuticals, Inc. v. Eli Lilly & Co., 598 F.3d 1336 (Fed. Cir. 2010) (written description requires possession shown in the disclosure).

Pitfalls. Interviewing only the CEO. Accepting "it's proprietary" as an answer about how something works. Skipping failed experiments, which often define the boundaries of claimable ranges. Recording no dates of conception.

Timing. Week one. The inventor's preparation guide in How to Prepare an Invention Disclosure for Your Patent Attorney and the task list in Preparing an Invention Disclosure: A Practical Checklist make the session faster. A capture template is in the Provisional Application Toolkit: Invention Capture Templates, Written Description Audits, and Conversion Calendars.

Cost. Mostly inventor time, plus counsel's time for the interview.

Step 4: Draft the specification

What to do. Write a document organized like a nonprovisional application:

• Title that names the invention plainly.
• Field in one or two sentences.
• Background that is short and factual. Do not characterize prior art as "the closest" or admit that a feature is "well known" unless you are sure; statements in the background can be used against you as admissions.
• Summary that states the invention at several levels of generality, from broadest to narrowest, in sentences that read like claims.
• Brief description of the drawings, one sentence per figure.
• Detailed description that walks through each embodiment, element by element, with reference numerals keyed to the figures, then describes alternatives for each element ("the actuator may be a piezoelectric transducer, a magnetostrictive transducer, or an eccentric-mass motor"), ranges with preferred values ("between 20 and 60 kHz, preferably 35 to 45 kHz, and in one example 40 kHz"), and the method of operation step by step.
• Examples and data, if available, including results that did not work.
• Definitions for terms that matter, especially any term you coined.
• Best mode. Describe the preferred way of carrying out the invention. Since the AIA, its absence does not defeat priority or invalidate claims, but 35 U.S.C. § 112(a) still requires it.

Why. For a nonprovisional claim to get the provisional's date, the provisional must describe and enable that claimed invention. That is what New Railhead Manufacturing, L.L.C. v. Vermeer Manufacturing Co., 298 F.3d 1290 (Fed. Cir. 2002) held, invalidating a patent whose provisional did not describe a claimed angle between a drill bit and its housing. Obvious variants of what is described are not themselves described, Lockwood v. American Airlines, Inc., 107 F.3d 1565 (Fed. Cir. 1997). A claim to a whole class must be enabled across the class, Amgen Inc. v. Sanofi, 598 U.S. 594 (2023), though routine experimentation is acceptable under the factors of In re Wands, 858 F.2d 731 (Fed. Cir. 1988). Describing a desired result without the means to achieve it fails, University of Rochester v. G.D. Searle & Co., 358 F.3d 916 (Fed. Cir. 2004).

Software and AI inventions. Describe the system architecture, data flows, the specific processing steps, the model type and structure, training data characteristics and preprocessing, how outputs are used to change something in the physical or technical world, and the specific technical improvement. Pseudocode and flowcharts help. A functional box labeled "AI engine" supports almost nothing, and eligibility under 35 U.S.C. § 101 will depend on the technical detail you include now. See Patent Subject-Matter Eligibility After Alice: A Practical Checklist.

Attachments. It is acceptable to attach papers, slides, and internal reports, and they become part of the disclosure. But an attachment is not a substitute for a description. Integrate the important material into the body, and remove anything confidential that is not needed (customer names, pricing).

Pitfalls. Words like "critical," "essential," "must," and "the invention is" narrow later claims. Prefer "in some embodiments." Inconsistent terminology invites claim construction fights; pick one term per thing. Do not describe only the best embodiment.

Timing. Weeks one through three for a typical mechanical or software invention.

Cost. The largest part of the professional fee. See the table below.

Step 5: Prepare figures

What to do. Draw every structural feature you may claim, from several views, with reference numerals. Include flowcharts for methods, block diagrams for systems, and data plots for results. Show alternatives in separate figures where practical.

Why. 35 U.S.C. § 113 requires drawings where necessary for understanding, and drawings alone can supply written description support (as the Federal Circuit held in Vas-Cath Inc. v. Mahurkar, 935 F.2d 1555 (Fed. Cir. 1991)). In New Railhead, the provisional's two drawings did not clearly show the claimed angle; that was the end of the priority claim.

Pitfalls. Photographs of prototypes alone; screenshots of user interfaces without any depiction of the underlying system; figures that show a feature without any text explaining it. Formal drawing rules in 37 C.F.R. § 1.84 are not strictly enforced for provisionals, but clean line drawings will carry into the nonprovisional and foreign filings without redrafting.

Timing and cost. Professional drafting typically costs a few hundred dollars per sheet, more for complex views; CAD exports can reduce the cost.

Step 6: Add draft claims (optional, recommended)

What to do. Write a claim set: one or two broad independent claims, a method claim, a system claim if relevant, and dependent claims that add each important feature and preferred range. Ten to twenty claims is typical.

Why. Claims are not required, 35 U.S.C. § 111(b)(2), but writing them is the best audit of the specification. Every claim term must find support in the description; if you cannot point to the paragraph that supports a limitation, the provisional does not support it. Claims also help foreign offices, which compare later claims to the priority document strictly. And a provisional with claims can be the basis of a request to treat it as a nonprovisional under § 111(b)(5), though that is rarely advisable because term would then run from the provisional's date.

Pitfalls. Treating draft claims as the definition of the invention and narrowing the description to match. The description should be broader than any single claim.

Timing and cost. A few hours to a day of drafting time.

Step 7: Determine entity status and fees

What to do. Decide whether the applicant qualifies as a small entity or micro entity, and pay the matching provisional filing fee under 37 C.F.R. § 1.16(d).

• Small entity (37 C.F.R. § 1.27): an individual inventor, a nonprofit or university, or a business with no more than 500 employees including affiliates, that has not assigned, licensed, or agreed to convey rights to a party that does not qualify. Small entities receive a 60 percent fee reduction under 35 U.S.C. § 41(h)(1).
• Micro entity (35 U.S.C. § 123 and 37 C.F.R. § 1.29): a small entity whose inventors and applicant each have gross income below three times the median household income for the prior year (the Office publishes the figure), whose inventors are named on no more than four previously filed nonprovisional applications (with exclusions, including for applications assigned to a former employer), and that has not conveyed rights to an entity over the income limit. An alternative basis covers applicants employed by or assigning to institutions of higher education. Micro entities receive an 80 percent reduction. A written certification is required.

Why. Paying the wrong fee can be corrected, but a deliberately false assertion is a different matter. An erroneous claim to small entity status must be corrected under 37 C.F.R. § 1.28(c) by paying the deficiency, and the Unleashing American Innovators Act of 2022, which increased the discounts, added 35 U.S.C. § 41(j): an entity found to have falsely asserted entitlement to a fee reduction faces a fine of at least three times the amount it failed to pay, unless it shows the assertion was made in good faith. Status is determined fee by fee, so a license to a large company signed in month six changes the fees owed on the nonprovisional.

Fees. The USPTO adjusted patent fees effective January 19, 2025. Under that schedule the provisional filing fee is $325 for an undiscounted filer, $130 for a small entity, and $65 for a micro entity, and an application size fee under 37 C.F.R. § 1.16(s) applies for each additional 50 sheets once the specification and drawings exceed 100 sheets.

Pitfalls. Treating venture funding as disqualifying (it is not, by itself); overlooking a license or option granted to a large company; counting the inventors' prior applications incorrectly for micro status.

Timing. Decide before filing; status can be asserted by paying the small entity fee, but micro status requires the certification form.

Step 8: Prepare the cover sheet

What to do. Prepare the cover sheet required by 37 C.F.R. § 1.51(c)(1), using the Office's provisional cover sheet form or an application data sheet. It must identify the application as a provisional and state:

• the name, city, and state or country of residence of each inventor;
• the title of the invention;
• the name and registration number of the practitioner, if any, and the docket number;
• the correspondence address;
• the applicant (for example, the assignee company); and
• whether the invention was made by or under a contract with a U.S. government agency, and if so, the agency and contract number.

Why. Without a cover sheet the application may be treated as a nonprovisional missing claims and fees. The inventor list on the cover sheet is the list that § 119(e) checks for the common-inventor requirement. An applicant other than the inventors may file if it is an assignee or obligated assignee, under 35 U.S.C. § 118.

Pitfalls. Typographical errors in names; omitting a contributor because the inventorship analysis is unfinished (name everyone plausibly an inventor of something described, and correct later if needed); omitting the government interest statement.

Timing. The cover sheet and fee can be filed after the specification with a surcharge, but there is no reason to do that if you can avoid it.

Step 9: File through Patent Center and check the receipt

What to do. Upload the specification, drawings, cover sheet, and any certification through Patent Center, the Office's electronic filing system, and pay the fee. Save the electronic acknowledgment receipt. When the official filing receipt arrives (usually within days to a few weeks), check:

• the filing date, which should be the day the specification and drawings were received under 37 C.F.R. § 1.53(c);
• inventor names and residences;
• the title and applicant;
• the entity status; and
• whether a foreign filing license was granted.

Why. The filing date is the asset you just bought. The Office does not review substance, so the receipt is the only confirmation you will get until much later. If the electronic system fails, 37 C.F.R. part 1 also permits Priority Mail Express filing under § 1.10, with the date of deposit as the filing date.

Foreign filing license. For an invention made in the United States, no application may be filed abroad, and no technical data sent abroad for that purpose, until six months after U.S. filing unless a license is granted, 35 U.S.C. § 184 and 37 C.F.R. part 5. The filing receipt typically grants one, but the Office can withhold it if the invention is referred for security review. Filing abroad without a required license can bar a U.S. patent under 35 U.S.C. § 185 unless a retroactive license is obtained. This matters most for companies with foreign co-inventors or foreign subsidiaries that may want to file locally first.

Pitfalls. Uploading the wrong version of the specification (keep a hash or copy of exactly what was filed); scanned images of text that become hard to search; forgetting to upload drawings; filing at 11:55 p.m. Eastern time and assuming the date. The Office dates electronic submissions by Eastern time.

Timing. Allow at least one business day before the disclosure deadline.

Step 10: Manage the twelve months

What to do.

1. Docket the dates. Month 9 decision meeting; month 11 target filing date; month 12 deadline (adjusted to the next business day if it falls on a weekend or federal holiday, under 35 U.S.C. § 21(b)); month 14 last day for restoration; the foreign twelve-month deadline separately.
2. Mark accurately. "Patent pending" is accurate while the provisional is pending. Remove it if the provisional lapses without a replacement, to avoid exposure under 35 U.S.C. § 292. Note that marking with an application gives no constructive notice for damages; that comes only from marking with an issued patent under 35 U.S.C. § 287. See Patent Marking Compliance: A Practical Checklist.
3. File follow-up provisionals. Each improvement gets its own provisional before it is disclosed. The nonprovisional can claim several provisionals, as long as it is filed within twelve months of the earliest one whose benefit is claimed.
4. Search and assess. Run a patentability search and decide which features are worth claiming. See Finding, Qualifying, and Using Prior Art: A Practical Guide.
5. Decide on foreign filing. By month nine, decide between a PCT application, direct Paris Convention filings, or U.S.-only protection.
6. Preserve the trade secret option. If the company decides not to patent, let the provisional lapse and do not file anything that would publish it.

Why. The provisional is abandoned at twelve months by operation of § 111(b)(5) and cannot be revived. The year is useful only if it is used.

Step 11: Convert, file abroad, or let it lapse

What to do. By month eleven, file one or more of:

• A nonprovisional application under 35 U.S.C. § 111(a) with a full specification (incorporating and expanding on the provisional), claims, drawings, and an application data sheet that claims the benefit of each provisional by application number, as 37 C.F.R. § 1.78 requires. The benefit claim must be made within the later of four months from the nonprovisional's filing date or sixteen months from the provisional's filing date.
• A PCT international application claiming the provisional's priority, which preserves the right to enter national phases, generally at thirty months from the priority date, including the U.S. national stage under 35 U.S.C. § 371.
• Direct foreign applications under the Paris Convention.

Also prepare:

• Inventor declarations under 35 U.S.C. § 115 and 37 C.F.R. § 1.63. They may be filed later, but collect them while the inventors are available. A substitute statement under § 1.64 is available when an inventor refuses or cannot be found.
• An information disclosure statement listing known material prior art. The duty of candor in 37 C.F.R. § 1.56 attaches to the nonprovisional, and inequitable conduct requires but-for materiality and specific intent to deceive, Therasense, Inc. v. Becton, Dickinson & Co., 649 F.3d 1276 (Fed. Cir. 2011).
• A nonpublication request, if the company will never file abroad and wants to keep the application secret until issuance. It must be filed with the application and certifies that the invention has not been and will not be the subject of a foreign or international filing that requires eighteen-month publication, under 35 U.S.C. § 122(b)(2)(B). A later foreign filing requires notice to the Office within forty-five days.
• A priority map. A chart showing, for each claim, the paragraphs and figures of each provisional that support it. That chart is the patentee's answer to a future priority challenge.

Why. Under § 119(e)(1), claims supported by the provisional get its date; new matter gets the nonprovisional's date. Term runs twenty years from the nonprovisional's filing date, 35 U.S.C. § 154(a)(2), because § 154(a)(3) excludes the provisional from the calculation.

If you miss month twelve. A nonprovisional filed within fourteen months can claim the benefit if the delay was unintentional, by petition under 37 C.F.R. § 1.78(b) with a fee. Foreign rights may not be recoverable; PCT restoration of priority is available in some receiving and designated offices on standards that vary. After fourteen months, the provisional's date is gone, and anything disclosed in the interim is prior art.

Timing and cost. See the table below. The nonprovisional is the largest single cost in the first two years.

Step 12 (for the other side): Auditing a provisional priority claim

Accused infringers, patent challengers, and acquirers in diligence need the reverse of this procedure.

1. Get the provisional. It becomes available in the patent's file history once a published application or patent claims its benefit.
2. Build a claim chart against the provisional. For each limitation of each asserted claim, identify the supporting text and figure in the provisional, or note its absence. Apply the same standard the patentee must meet: possession of the claimed invention (not obvious variants) and enablement of its full scope.
3. Find the intervening art. Look for publications, products, offers for sale, and patent filings between the provisional's date and the nonprovisional's, especially the patentee's own launch materials.
4. Shift the burden. Once intervening art is shown, the patentee must come forward with evidence of entitlement to the earlier date, PowerOasis, Inc. v. T-Mobile USA, Inc., 522 F.3d 1299 (Fed. Cir. 2008). The challenger keeps the ultimate burden of persuasion; in an inter partes review, the petitioner relying on a reference's provisional must show that the provisional supports the reference's claims, Dynamic Drinkware, LLC v. National Graphics, Inc., 800 F.3d 1375 (Fed. Cir. 2015).
5. Check the formalities. Was the nonprovisional filed within twelve months (or restored)? Is there a timely specific reference in the application data sheet? Is at least one inventor common to both?
6. Check ownership and inventorship. Compare the provisional's inventors with the patent's, and look for missing assignments.

The charts for this work are in the Prior Art Toolkit: Search Protocols, Invalidity Charts, and On-Sale Bar Investigations, and the PTAB route in Patent Post-Grant Proceedings: IPR, PGR, and Reexamination at the PTAB.

Timeline and cost table

Professional fees vary widely by technology, region, and how complete the inventor's materials are. The ranges below are typical market ranges reported by practitioners, not quotations, and government fees should be confirmed on the USPTO fee schedule.

Worked example: Tidewell Robotics, from the fair invitation to the nonprovisional

The example uses invented facts. Dates are counted from the Monday Marisol Vance received the fair invitation ("Day 1"). The fair is on Day 36.

Before you start

Counsel's first call covers the five decisions. Tidewell wants patents on the robot's mechanics (visible to any farmer who buys one) and is unsure about Ken's vibration-mapping method, which runs on Tidewell's cloud servers. Foreign protection matters: Norway, Scotland, Chile, and Canada are the major salmon-farming markets. Tidewell received a federal SBIR Phase I grant last year for an earlier version of the cleaning head. The deadline is not Day 36: the fair publishes speaker abstracts on Day 22, and the seed investor's test-tank demonstration is on Day 15, attended by two investors and a farm operator who has not signed anything.

Step 1: Deadline and disclosure control

Counsel sets Day 13 as the filing date for a first provisional covering the robot and Day 20 for a second covering anything not ready by Day 13. The investor demo on Day 15 goes ahead only after the farm operator signs a two-page NDA. The fair abstract is rewritten to describe the problem and results without the mechanism. Tidewell's marketing lead agrees to post nothing about the robot until counsel clears it.

Step 2: Ownership and inventorship

Marisol and Ken signed founder agreements with present assignment language. The mechanical design was refined by Lucía Ferro, a contract engineer in Halifax, Nova Scotia, whose consulting agreement says she "will assign" inventions on request. Counsel obtains a present assignment from Lucía of all inventions relating to the robot, signed on Day 4. Because Lucía worked in Canada, counsel also asks where each piece of the invention was made. Her contribution, a tread-clamping mechanism, was conceived while she was in Halifax. That raises a question under the foreign filing license rules, which apply to inventions made in the United States; counsel notes it for Step 9 and for any Canadian filing.

The SBIR grant covered an earlier cleaning head, not the cavitation jets or the mapping method. Counsel confirms with Tidewell's grant administrator which features arose under the grant, files the required invention disclosure with the funding agency for the earlier head, and includes a government interest statement in the provisional that covers the head.

Step 3: Invention capture

Counsel spends two sessions with Marisol, Ken, and Lucía. The questions about alternatives produce material the team had not thought to mention:

• The cavitation nozzles were tested at three standoff distances; one damaged the net coating, which defines an upper limit.
• The treads were tried with magnetic, suction, and mechanical clamping; mechanical clamping (Lucía's design) works on nylon and polyethylene nets, and suction works only on rigid panels.
• Ken's mapping method detects tears from a change in the frequency spectrum of tread vibration as the robot crosses a missing mesh cell. He tested two signal-processing approaches (a short-time Fourier transform with thresholding and a small convolutional network trained on labeled runs). He also realized the same signal detects biofouling thickness, which nobody had planned to claim.

The capture log records who conceived each feature and when.

Steps 4 to 6: Drafting, figures, and claims

Provisional A (robot mechanics). Thirty-one pages and twelve figures: the robot body, tread modules in three clamping variants, the nozzle array, standoff ranges (with the damaging distance identified as an upper limit), pump pressures, the cleaning pattern, the tether, and the control loop. Eighteen draft claims, including a broad claim to a net-crawling robot with a tread that clamps the mesh and a cavitation nozzle held at a standoff distance within a stated range.

Provisional B (mapping method). Twenty pages, seven figures, including flowcharts for both signal-processing approaches, plots of the vibration spectrum over intact and torn mesh, the training data and labeling scheme for the network, the thresholds, and the biofouling-thickness variant. The description explains that the output is used to stop the cleaning head before it reaches a tear (to avoid widening it) and to generate a repair work order with the tear's location. Twelve draft claims, including a method claim that ties the signal processing to the robot's control.

Counsel and Ken argue about whether the mapping method should be a trade secret. They agree to file Provisional B to preserve the option, with the final decision at month nine.

Step 7: Entity status

Tidewell has nine employees and no licenses. It qualifies as a small entity. It does not qualify as a micro entity: Tidewell itself is the assignee, and its prior-year gross income from pilot contracts exceeds the micro-entity income limit, which disqualifies the application under § 123(a)(4) regardless of the inventors' own incomes. (Marisol's five earlier applications, assigned to a former employer, would not have counted against the filing limit because of the employer-assignment exclusion.)

Steps 8 and 9: Cover sheets and filing

Provisional A is filed on Day 12 through Patent Center, naming Marisol and Lucía (with Lucía's residence as Halifax, Nova Scotia) and with Tidewell as applicant. Provisional B is filed on Day 19, naming Ken. Both filing receipts arrive within two weeks and grant foreign filing licenses. Counsel saves a copy of each filed document with its electronic acknowledgment.

Step 10: The twelve months

• Day 15. The investor demo goes ahead under NDA.
• Day 36. Marisol speaks at the fair. Everything she shows is in Provisional A. Tidewell starts marking its brochure "patent pending."
• Month 4. Ken improves the network so it identifies tear size. Provisional C is filed before Tidewell tells customers.
• Month 7. A patentability search finds a Japanese publication describing a hull-cleaning robot with cavitation nozzles but nothing on net-gripping treads or mesh-tear detection.
• Month 9. The decision meeting. Tidewell will patent the robot mechanics and the mapping method. Ken's argument for secrecy loses because the stop-before-tear behavior is visible to any customer and a competitor could infer the method from it.

Step 11: Conversion

In month eleven, Tidewell files one nonprovisional claiming Provisionals A, B, and C, and a PCT application claiming all three. The application data sheet lists each provisional by number. Inventor declarations from Marisol, Ken, and Lucía are filed with the application. Counsel's priority map shows: robot claims supported by A; mapping claims supported by B; tear-size claims supported by C; and two new claims combining mapping with the robot's cleaning schedule, which take the nonprovisional's date. Counsel checks that nothing disclosed between the provisionals and the nonprovisional describes those combined claims; nothing does. No nonpublication request is filed because of the PCT application. An IDS cites the Japanese publication.

What changed because of the process

A thin provisional filed on Day 21 from Marisol's fair slides would have described a "net cleaning robot with cavitation" and nothing about clamping, standoff limits, or mapping. Its claims would have taken month eleven's date for almost everything, and the fair presentation would have destroyed novelty in Norway, Chile, and Europe.

Common mistakes

1. Using the disclosure date as the filing date. Abstracts publish early; demos happen before talks. Find the earliest event.
2. Drafting from a pitch deck. Decks describe benefits. Provisionals need structure, steps, alternatives, and ranges.
3. Leaving out what failed. Failed experiments define limits and support range claims.
4. One embodiment. If you will want to claim the category, describe several members of it.
5. Skipping figures for software. Architecture diagrams and flowcharts are how software claims find support.
6. Promises to assign. "Will assign" and "agrees to assign" may not pass title. Get present assignments before filing.
7. Guessing entity status. Check employees, affiliates, licenses, and (for micro status) income and prior applications.
8. Not reading the filing receipt. Wrong names, wrong dates, and missing foreign filing licenses are easiest to fix early.
9. Forgetting follow-up provisionals. Improvements disclosed before filing are prior art against claims to them abroad and, after a year, in the United States.
10. Treating month twelve as the target. Plan to file by month eleven. Restoration is a petition, not a right, and does not protect foreign priority.
11. Dropping the benefit claim. The nonprovisional must refer to each provisional by number in the application data sheet within the time the rules allow.
12. Leaving "patent pending" on after a lapse. Remove it, or file something that keeps it true.

Frequently asked questions

How long should a provisional be? As long as it needs to be to describe every feature you might claim, with alternatives and figures. For a simple mechanical invention, fifteen to thirty pages is common; complex software, chemistry, or biology often requires more. Length is not the measure; completeness is.

Can I file the same provisional in other countries? No. A provisional is a United States filing. Within twelve months you can file a PCT application or national applications abroad claiming its date, provided you have a foreign filing license (or six months have passed) and the foreign application describes the same invention.

Can I file more than one provisional and combine them? Yes. A nonprovisional can claim the benefit of several provisionals if it is filed within twelve months of each one whose benefit it claims. The earliest provisional sets the outside deadline for itself; later ones set their own.

What if I discover after filing that I left out an important feature? File another provisional immediately, before any disclosure of that feature. It gets its own date. The first provisional cannot be amended to add it.

Do I need a prior art search before filing a provisional? Not legally. A search can help you describe what is different and avoid wasted effort, but when a disclosure is days away, file first and search during the year.

Should the provisional include data? If you have it, yes. Data supports enablement and helps show that the invention works across claimed ranges. Do not delay filing to generate data unless the claims will depend on it.

What happens if the provisional lapses? It is abandoned and is never published. You lose the date, but you have not disclosed anything through the filing itself. Anything you disclosed elsewhere remains prior art.

Can a provisional be used for a design? No. Design applications cannot claim the benefit of a provisional. See Design Patent Toolkit: A Roadmap for Protecting How a Product Looks.

Takeaways

• The deadline is set by the earliest disclosure or offer, not by the event everyone is focused on.
• Paper ownership and record inventorship before filing; fixing them later depends on people you may no longer control.
• Capture the alternatives and ranges, and write them down. The provisional supports only what it describes.
• Draw what you will claim and write draft claims to test support.
• Check entity status, file through Patent Center, and read the filing receipt.
• Calendar month nine for decisions, month eleven for filing, and the foreign twelve-month deadline separately.
• At conversion, build a priority map: it is the answer to every future priority challenge.

For the task-by-task version, use the Provisional Patent Application Checklist: A Practical Checklist. For forms, including the capture template, written description audit worksheet, and conversion calendar, use the Provisional Application Toolkit: Invention Capture Templates, Written Description Audits, and Conversion Calendars.

This document is general information, not legal advice for any particular situation. Fees, forms, and Patent Office procedures change; confirm current requirements and consult a registered patent practitioner before filing.

Related Documents

Related Articles

• Provisional Patent Applications: What They Protect, What They Do Not, and How to Keep the Priority Date: the doctrine and cases behind each step.
• Prior Art Under the America Invents Act: Section 102, the On-Sale Bar, Public Use, and the One-Year Grace Period: which disclosures count and when.
• International Patent Filing: The PCT, Paris Priority, National Phase, and Foreign Prosecution: the foreign sequence that starts with the provisional.
• Patent Ownership, Assignments, and Standing: Chain-of-Title Problems That Sink Cases: ownership failures that surface in litigation.
• University Technology Transfer and Bayh-Dole: Who Owns Federally Funded Inventions: government-funded inventions and their filing deadlines.
• Trade Secrets and Generative AI: Reasonable Measures, Prompt Leakage, and Vendor Terms: confidentiality when using AI tools to draft.

Related Guides

• How to Prepare an Invention Disclosure for Your Patent Attorney: inventor preparation for the capture session.
• Finding, Qualifying, and Using Prior Art: A Practical Guide: searching during the provisional year.
• Building a Generative AI Use Policy That Protects Trade Secrets: A Practical Guide: rules for AI-assisted drafting.
• Managing Willfulness Risk After a Patent Notice Letter: A Practical Guide: what a competitor's "patent pending" notice does and does not trigger.

Related Checklists

• Provisional Patent Application Checklist: A Practical Checklist: every step of this guide as a task list.
• Preparing an Invention Disclosure: A Practical Checklist: what to gather before drafting.
• Patent Marking Compliance: A Practical Checklist: accurate "patent pending" and patent marking.
• International Patent Filing Checklist: A Practical Checklist: the month-twelve foreign filing tasks.

Related Toolkits

• Provisional Application Toolkit: Invention Capture Templates, Written Description Audits, and Conversion Calendars: templates for each step.
• Prior Art Toolkit: Search Protocols, Invalidity Charts, and On-Sale Bar Investigations: charts for auditing priority claims.
• Global Patent Portfolio Toolkit: Filing Calendars, National Phase Instructions, and Cost Models: calendars and budgets for the foreign stage.
• Trade Secret Protection Toolkit: Building and Defending a Confidentiality Program: the alternative when you let the provisional lapse.