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(In)Valid Patents, Paul R. Gugliuzza

Notre Dame Law Review

Increasingly, accused infringers challenge a patent’s validity in two different forums: in litigation in federal court and in post-issuance review at the Patent and Trademark Office (PTO). These parallel proceedings have produced conflicting and controversial results. For example, in one recent case, a district court rejected a challenge to a patent’s validity and awarded millions of dollars in damages for infringement. The Federal Circuit initially affirmed those rulings, ending the litigation over the patent’s validity. In a subsequent appeal about royalties owed by the infringer, however, the Federal Circuit vacated the entire judgment—including the validity ruling and damages award it …