A recent ruling by the U.S. Court of Appeals for the Federal Circuit offers guidance on the patent application reissue process, which gives patent owners a two-year window to broaden patent claims after the patent issues.

The Federal Circuit’s May 3 unanimous ruling in In re Mostafazadeh affirmed an August 2009 ruling by the U.S Patent and Trademark Office’s Board of Patent Appeals and Interferences, which rejected 13 claims in the Mostafazadeh patent reissue application.

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