On May 28, a group of five former Directors, Deputy Directors and Patent Commissioners at the U.S. Patent and Trademark Office (USPTO) sent a letter addressed to current USPTO Director Kathi Vidal in opposition to a rule package on terminal disclaimer practice proposed earlier this month. This group of highly-ranking former government officials join a growing chorus of voices who are concerned by the apparent overreach of the nation’s patent granting agency into substantive rulemaking that would create enforceability issues for companies making use of terminal disclaimers to obtain patent rights.

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