Uyte, LLC and SEG Hockey, LLC v. Mammoth Hockey, LLC — 10th Cir. (Sep 16, 2026)

No. 25-4166 Argued September 16, 2026 Published September 30, 2026

A small Oregon company called Mammoth Hockey, which has sold hockey bags under that name since 2014, is in a trademark fight with Utah's National Hockey League team. After a fan-voting process, the club unveiled the name Utah Mammoth in May 2025 and began selling branded merchandise, including hockey bags. The bag maker says the much bigger team's reach could bury its older brand and confuse buyers; the team says the two marks can coexist. Mammoth Hockey asked a Utah district court to temporarily stop the team from using the name while the trademark case continues. The judge refused, and this appeal asks whether the court used the right test for so-called reverse confusion.

Uyte, LLC and SEG Hockey, LLC v. Mammoth Hockey, LLC (No. 25-4166) — U.S. Court of Appeals for the Tenth Circuit, argued September 16, 2026.

Sources

Argument audio — Tenth Circuit (public domain, 17 U.S.C. § 105):https://www.ca10.uscourts.gov/sites/ca10/files/oralarguments/25-4166.mp3

Argument date and docket — Tenth Circuit:https://www.ca10.uscourts.gov/oralargument/search-results?field_oa_hearing_date_value%5Bmin%5D%5Bdate%5D=08%2F01%2F2026&field_oa_hearing_date_value%5Bmax%5D%5Bdate%5D=09%2F30%2F2026

Signed preliminary-injunction order — U.S. District Court (in USPTO record):https://ttabvue.uspto.gov/ttabvue/ttabvue-91306393-OPP-4.pdf

Case and counsel — Tenth Circuit docket:https://dockets.justia.com/docket/circuit-courts/ca10/25-4166

Gerald W. Griffin — Carter Ledyard & Milburn:https://www.clm.com/practice/litigation-and-disputes/internal-investigations-and-white-collar-defense/

Bruce R. Ewing — Dorsey & Whitney:https://www.dorsey.com/people/e/ewing-bruce-r

0:00Introduction
1:16Advocate — Gerald Griffin
18:03Advocate — Bruce Ewing