US Trade mark: TTAB clarifies allegation time period for dilution claims

Managing IP is part of Legal Benchmarking Limited, 1-2 Paris Gardens, London, SE1 8ND

Copyright © Legal Benchmarking Limited and its affiliated companies 2026

Accessibility | Terms of Use | Privacy Policy | Modern Slavery Statement

US Trade mark: TTAB clarifies allegation time period for dilution claims

Recently, in Omega SA v Alpha Phi Omega, the Trademark Trial and Appeal Board (TTAB) issued a precedential decision which provided clarification concerning at what point in time a plaintiff must establish fame of its mark in order to support a claim of dilution by blurring in a TTAB proceeding. The case is significant because it may affect the ability of a prospective plaintiff to succeed on a claim of dilution by blurring in an opposition or cancellation proceeding.

In Omega SA, the plaintiff pleaded ownership of several registrations consisting of the term Omega in support of an opposition against two use-based trade mark applications filed by Alpha Phi Omega for marks which included either the word Omega or the Omega letter of the Greek alphabet, one covering jewellery and one covering apparel. Omega SA asserted two bases for its opposition, namely, a likelihood of confusion and likelihood of dilution by blurring.

In responding to a motion for summary judgment filed by the applicant, Omega SA contended that it was required only to establish that its mark became famous prior to the filing date of the applicant's application. However, since the application was based on use of the mark, the TTAB determined that plaintiff was required to establish that its mark was famous prior to the date of first use by the applicant (rather than the filing date). The TTAB noted, however, that in those circumstances where an applicant is unable to establish a date of first use for the applied-for marks, then an opposer need only demonstrate that fame existed prior to the filing date of the application.

The TTAB further clarified that a plaintiff asserting a claim of dilution by blurring must "establish that its mark became famous prior to any established, continuing use of the defendant's involved mark as a trademark or trade name, and not merely prior to use in association with the specific identified goods or services set forth in a defendant's subject application or registration". The TTAB noted that, unlike in other sections of the Lanham Act, applicable language of the Trademark Dilution Revision Act of 2006 does not limit use of a mark to any specific goods or services such that, for purposes of a dilution claim, the focus should be on any use of the mark at issue.

The result was that, for purposes of defending against a claim of dilution, the applicant could rely on its historical use of the applied-for mark in connection with goods or services other than those identified in the application. In the case at hand, the effect of the decision was to require Omega SA to claim fame over 80 years earlier, all but extinguishing the opposer's ability to sustain such a claim. Since the opposer had failed to state in its initial pleadings the date on which it alleged its mark became famous, the TTAB gave the opposer 20 days to properly plead dilution, albeit with the difficult evidentiary task of proving fame before the applicant's early first use date.

ash.jpg
Danow_Bret

Karen Artz Ash

Bret J Danow


Katten Muchin Rosenman LLP 575 Madison AvenueNew York, NY 10022-2585United StatesTel: +1 212 940 8554Fax: +1 212 940 8671karen.ash@kattenlaw.comwww.kattenlaw.com

more from across site and SHARED ros bottom lb

More from across our site

News of Health Hoglund joining Sisvel and the Delhi High Court staying a $2.2 million decree in favour of Philips were also among the top talking points
The firm is continuing its aggressive IP hiring streak with the addition of partner Matthew Rizzolo
Pantech counsel Shogo Matsunaga speaks exclusively to Managing IP about how his team proved Google’s unwillingness, and ultimately secured a landmark SEP settlement
New partners, including the firm’s first female head of a department, are eyeing a deeper focus on client understanding
Chunguang Hu of China PAT explains why his ‘insider’ experience as a patent examiner benefits clients and why he wants to debunk the myth that IP has limited value in China
Essenese Obhan shares his expansion plans and vision of creating a ‘one-stop shop’ for clients after Indian firms Obhan & Associates and Mason & Associates joined forces
From AI and the UPC to troublesome trademarks in China, experts name the IP trends likely to dominate 2026
Colm Murphy says he is keen to help clients navigate cross-border IP challenges in Europe
With 2025 behind us, US practitioners sit down with Managing IP to discuss the major IP moments from the year and what to expect in 2026
Large-scale transatlantic mergers will give US entities a strong foothold at the UPC, and could spark further fragmentation of European patent practices
Gift this article