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USPTO Tells Fed. Circ. To Reject Assignor Estoppel Case

By Ryan Davis ( January 14, 2026, 6:17 PM EST) -- The U.S. Patent and Trademark Office has urged the Federal Circuit to reject a mandamus petition by Tessell Inc. that claimed the office flouted precedent by using assignor estoppel to reject patent challenges, saying the decisions were based on discretion, not that legal doctrine....

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