Issue No. 068 · Story 04 · October 24, 2026

USPTO Refuses Anthropic's CLAUDE MYTHOS Registration for Now

The USPTO issued a nonfinal refusal of Anthropic's application to register CLAUDE MYTHOS for AI software services on October 20. The examiner found a likelihood of confusion with a MYTHOS registration for software services involving searchable databases and customizable surveys. Anthropic has three months to respond.

§No final determination on registration has been made, and the USPTO record showed no response as of October 24.
§The examiner said CLAUDE MYTHOS contains the whole registered MYTHOS mark and Anthropic's registered CLAUDE house mark does not considerably change the overall impression it makes.
§Two earlier-filed applications may also bar registration if they register, and Anthropic must meet a foreign registration requirement tied to its claimed priority from a Jamaica filing.

THE TAKEAWAY

The registration question is whether adding Anthropic's registered CLAUDE house mark to MYTHOS changes the likelihood of confusion with the existing registration. The refusal addresses registration, not use of the name.

Filing: ESCA Filings

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