Honeywell International Inc. v. Arkema Inc., No. 18-1151 (Fed. Cir. 2019)Annotate this Case
Honeywell’s patent, directed to fluoroalkene compounds used in refrigeration systems and other applications, issued in October 2015 and recites a chain of priority applications dating back to 2002, all of which were incorporated by reference. During prosecution of the patent, Honeywell filed a preliminary amendment that canceled all 20 claims recited in the original application and added 20 new claims directed to different subject matter: automobile air conditioning systems. The Patent Trial and Appeal Board initiated post-grant review proceedings, finding that the claims of the patent were only entitled to a priority date of March 2014—the filing date of the application that led to the patent—rather than the 2002 priority date that would result if the priority chain adequately supported the claims. PGR proceedings are available only for patents having at least one claim with an effective filing date on or after March 16, 2013. There were several prior art references dated from the period between 2002 and 2014. The Federal Circuit vacated the Board’s refusal to grant Honeywell leave to seek a Certificate of Correction to correct the challenged patent. The Board abused its discretion by assuming the authority that 35 U.S.C. 255 expressly delegates to the Director: to determine when a Certificate of Correction is appropriate.