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A comparison of patent cases’ post-grant proceedings available at the USPTO. For further details on each proceeding, visit the links at the top of the page.

Proceeding Who may seek? When does it apply? Legal standard? Grounds? Estoppel?
Inter Partes Review Anyone other than patent owner • Available starting September 16, 2012• Applies to all patents – beginning nine months after issue (i.e., after Post-Grant Review window)• Reasonable likelihood that petitioner would prevail on at least 1 challenged claim • Patents• Published patent apps• Printed publications Raised or reasonably could have raised
Covered Business Method Anyone other than patent owner • Available starting September 16, 2012• Applies to all patents related to “financial services” but excludes “technological innovations” • More likely than not that at least 1 claim is unpatentable• Petitioner sued or “charged with infringement” Any invalidity ground Narrow: Raised (USPTO and Civil)
Post Grant review Anyone other than patent owner • Available starting September 16, 2012• Applies only to patents having a claim with a priority date on or after March 16, 2013, within nine months of issue• More likely than not that at least 1 claim is unpatentable Any invalidity ground Raised or reasonably could have raised
Ex Parte Reexamination Anyone Available now Substantial new question of patentability • Patents• Published patent apps• Printed publications No legal estoppel
Supplemental Examination Patent owner only • Available starting September 16, 2012• Applies to all patents Substantial new question of patentability would result in Ex Parte Reexamination by PTO Any information N/A
Derivation Proceedings Inventor only Applies to all claims with priority dates on or after March 16, 2013 (Interference remains available for others) Claimed invention derived from another N/A N/A