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Intellectual PropertyTrademark

Navigating the Maze of Trademark Confusion: Key Considerations for Brand Owners

Likelihood of confusion is the central question in nearly every trademark infringement dispute, but the doctrine is far richer and more circuit-dependent than a simple "are the marks similar" inquiry suggests. This article explains the multifactor tests applied by the federal courts and the Trademark Trial and Appeal Board -- including the Second Circuit's Polaroid factors, the Federal Circuit's DuPont factors, and the Ninth Circuit's Sleekcraft factors -- and walks through each factor with worked examples. It examines the recognized variants of confusion (direct, reverse, sponsorship, initial-interest, and post-sale), the role of consumer sophistication, secondary liability for those who enable infringers, and how survey evidence in the Eveready and Squirt formats is built and attacked. It addresses dilution of famous marks under the Trademark Dilution Revision Act, the special problems of keyword advertising and the digital marketplace, the impact of artificial intelligence on brand selection and clearance, a comparative look at how the European Union and China analyze confusion, the Supreme Court's 2023 decision in Jack Daniel's v. VIP Products narrowing the Rogers test, and the remedies and defenses that decide what a confusion finding is actually worth. It closes with a practical brand-protection program that brand owners can implement before a dispute ever arises.

Casey Scott McKaySeptember 18, 202361 min read