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Yes. Through the PTO (reexam, IPR, other PTAB proceedings) or through a federal court. Happens every day.



PTO invalidation happens every day but takes /years/ to process.

Until then, frivolous patent holders have free rein to coerce contracts that licence claims they know won't stand re-examination.

https://www.ipwatchdog.com/2017/02/17/federal-circuit-affirm...




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