Trade Dress and the Functionality Doctrine: Why Good Design Sometimes Cannot Be Owned
By Casey Scott McKay ·
Trade dress protects the look and feel of a product, its packaging, or a place of business, but two doctrines decide almost every case before anyone reaches likelihood of confusion. The first is the packaging/configuration divide drawn by Two Pesos and Wal-Mart Stores v. Samara Bros., which makes product design permanently dependent on proof of secondary meaning; the second is functionality, an absolute bar that no amount of fame or investment can overcome. This article traces functionality from footnote 10 of Inwood Laboratories through Qualitex and TrafFix Devices, explains the expired-utility-patent inference and the Morton-Norwich factors, and maps the deep circuit disagreement over aesthetic functionality after Christian Louboutin. It also covers the burden of proof under 15 U.S.C. 1125(a)(3), the advantage a registration buys, and how courts treat combinations of individually functional elements. It is written for practitioners clearing, registering, or defending product and packaging designs, and it closes on the places the law remains genuinely unsettled.
IP and Technology > Trademarks | Article | Published 23 November 2024 - Updated 8 October 2025 | Casey Scott McKay - marksy.us
Summary. Trade dress protects the look and feel of a product, its packaging, or a place of business — but two doctrines decide almost every case long before anyone argues about confusion. The first is the packaging/configuration divide drawn by Two Pesos v. Taco Cabana and Wal-Mart Stores v. Samara Bros., which makes product design permanently dependent on proof of secondary meaning. The second is functionality, an absolute bar that no amount of fame, investment, or consumer recognition can cure. This article traces the doctrine from footnote 10 of Inwood Laboratories through Qualitex and TrafFix Devices, explains the expired-utility-patent inference and the Morton-Norwich factors, and maps the deep circuit disagreement over aesthetic functionality after Christian Louboutin v. Yves Saint Laurent. It also covers who bears the burden of proof under 15 U.S.C. § 1125(a)(3), what a registration actually buys, how courts treat combinations of individually functional elements, and the questions that remain genuinely open.
Keywords: trade dress · functionality doctrine · product configuration · product packaging · utilitarian functionality · aesthetic functionality · secondary meaning · inherent distinctiveness · traffix devices · two pesos · wal-mart v samara · inwood footnote 10 · morton-norwich factors · expired utility patent · competitive necessity · section 43(a)(3) · louboutin red sole · section 2(e)(5) · alternative designs · trade dress registration
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