The Everyday Dictionary of Law

The Everyday Dictionary of Law provides legal vocabulary currently in use in common law jurisdictions such as most notably, in the United States. The dictionary is compiled specifically for commercial and intellectual property law practitioners, which provides simple definitions and meanings in American English, for legal terms (including Latin terms) used in formal correspondence, court proceedings, and motion practice as well as common language words that are frequently used in the same. It is a simple reference guide for attorneys, paralegals as well as casual readers who need to check the meaning of a particular legal term in due course of their work.

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PGR

Definition:

Post grant review. Established as part of the America Invents Act (AIA), a third party may challenge a US patent within nine months of issuance, if it has been issued under first-inventor-to-file (FITF).
It differs from an inter partes review (IPR) as the scope of what can be challenged is wider. It can include subject matter ineligibility, anticipation and obviousness, indefiniteness, lack of enablement, or failure to meet the written description requirement. An inter partes review, on the other hand, is limited to anticipation and obviousness.
As notes from the Congressional Record from the debate on the America Invents Act explain: "This bill would finalize the shift towards a European-style patent system through changing from a ‘‘first-to-invent’’ to ‘‘first-to-file’’ system; establishing a new set of ‘‘prior use’’ rights; and adopting a third European-style ‘‘post-grant’’ challenge."