When does a PTO Cancellation undermine a District Court Judgment of Infringement?

PhaZZer v. Taser (Supreme Court 2020)  [Petition for writ of certiorari]

PhaZZer defaulted in the litigation and the district court awarded $7.8 million to Taser. On appeal, the Federal Circuit quickly issued a R.36 no-opinion affirmance in 2019.  Then, in February 2020 the USPTO finally cancelled the claims of the asserted patent (via reexamination). US7234262.


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