Tsan Abrahamson
Tsan Abrahamson is a USPTO correspondent of record based in Berkeley, CALIFORNIA, listed on 2,233 trademark filings (1,213 currently live). The correspondent has worked across 525 distinct trademark owners — a mid-breadth client roster at roughly 4.3 marks per client. In TTAB matters, Tsan Abrahamson is attorney of record on 106 contested oppositions and cancellations, more often as plaintiff (73) than defendant (33). The correspondent is associated with COBALT LLP.
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Explore the Trademark Intelligence Library
Editorial deep dives on prosecution strategy, TTAB, and brand portfolios
Four Ways to Lose a Trademark Fight You Thought You'd Cleared
xAI, a champagne widow, an Italian wine label, and a matcha bar — what the four prongs of du Pont Factor 1 (appearance, sound, meaning, commercial impression) look like in real refusals and TTAB cases.
Trump, Palm Beach, and the Airport Naming Story the Trademark Register Doesn't Support
Forbes floated whether renaming Palm Beach International Airport could enrich Donald Trump through licensing. We checked the trademark register. The marks that would make that possible don't exist.
Why the USPTO Told MLB It Can't Own 'Play Ball' — And What the Record Teaches Founders
MLB waited four years for the USPTO to reject PLAY BALL for clothing. The trademark register explains why — and hands founders a filing lesson worth real money.