Definition
Post-grant review (PGR) is a proceeding before the PTAB that allows a challenge to a patent on almost any ground within nine months of its grant.
Why It Matters Legally
PGR offers broader attack grounds than IPR but has a short nine-month window. It is a powerful early option for competitors watching a rival’s newly issued patents.
Example Use Case
Within months of a competitor’s patent issuing, a company files a PGR challenging it for lack of written description and obviousness.
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Related Terms
Post-Grant Review, Prior Art, Patent Validity, Claim Construction