The America Invents Act of 2011 created new administrative proceedings for challenging possibly invalid patents.

These proceedings phase in based on the application filing date of the patent being challenged, with the most readily available at the moment being inter partes reviews, or IPRs. Valid patent claims must have been new to the technical arts at the time the patent application was filed. Patent claims which were not new can be canceled in an IPR. If all claims are canceled, the patent is essentially revoked.

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