Intellectual PropertyPatent Litigation
Finding Evidence of Inequitable Conduct in Patent Prosecution: A Comprehensive Guide for Attorneys and Inventors
This litigator's companion guide explains how to find, plead, and prove (or defend against) inequitable conduct in patent prosecution. It walks through the heightened pleading requirements of Exergen Corp. v. Wal-Mart Stores under Federal Rule of Civil Procedure 9(b), the demanding Therasense standard of but-for materiality and specific intent to deceive, and the duty of candor codified at 37 C.F.R. Section 1.56. It maps the practical sources of evidence a litigator mines -- file histories, Information Disclosure Statements, foreign counterparts, inventor declarations, and assignment records -- and lays out discovery strategy, crime-fraud and prosecution-bar issues, the use of technical and patent-practice experts, and the clear-and-convincing burden at trial. Worked hypotheticals illustrate how the pieces fit together, and a closing FAQ answers the questions clients ask most. The article is written so a judge, a practicing lawyer, and an inventor can all follow it.