Waiting Too Long: Laches, Acquiescence, and Estoppel in Trademark Law
By Casey Scott McKay ·
The Lanham Act contains no statute of limitations, which sounds like good news for trademark owners until you understand what replaced it. In its place sit three equitable doctrines - laches, acquiescence, and estoppel - that ask not how long you waited but what your waiting did to the other side. This article explains how courts set the clock from the date a diligent owner should have known, how they borrow a state limitations period to build a presumption in either direction, and why the two kinds of prejudice that matter are almost never the ones clients describe. It covers progressive encroachment, the doctrine that excuses delay when a small nuisance becomes a real competitor, and the ceiling that inevitable confusion places on every equitable defense. It closes with the Board's very different clock, which starts at publication rather than knowledge, and with what an enforcement program has to look like to survive all of it.
IP and Technology > Trademarks | Article | Published 30 March 2024 - Updated 6 February 2025 | Casey Scott McKay - marksy.us
Summary. The Lanham Act contains no statute of limitations, which sounds like good news for trademark owners until you understand what replaced it. In its place sit three equitable doctrines — laches, acquiescence, and estoppel — that ask not how long you waited but what your waiting did to the other side. This article explains how courts set the clock from the date a diligent owner should have known, how they borrow a state limitations period to build a presumption in either direction, and why the two kinds of prejudice that matter are almost never the ones clients describe. It covers progressive encroachment, the doctrine that excuses delay when a small nuisance becomes a real competitor, and the ceiling that inevitable confusion places on every equitable defense. It closes with the Board's very different clock, which starts at publication rather than knowledge, and with what an enforcement program has to look like to survive all of it.
Keywords: laches trademark · acquiescence defense · equitable estoppel trademark · progressive encroachment · unreasonable delay · evidentiary prejudice · expectations-based prejudice · analogous statute of limitations · knew or should have known · inevitable confusion · unclean hands · petrella laches · sca hygiene · ttab laches publication date · morehouse defense · section 1069 · section 1115(b)(9) · demand letter tolling · e-systems factors · delay bars injunction
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