September 16, 2013 – The Federal Circuit heard arguments on Friday in Lighting Ballast Control LLC v. Philips Electronics North America. In March, the court granted a petition for rehearing en banc to reconsider its 1998 ruling in Cybor Corp. v. FAS Techs. Inc., which held that district court claim construction rulings are reviewed on appeal entirely de novo (without deference).
The rehearing was granted to address the following questions:
a. Should this court overrule Cybor Corp. v. FAS Technologies, Inc., 138 F.3d 1448 (Fed. Cir. 1998)?
b. Should this court afford deference to any aspect of a district court’s claim construction?
c. If so, which aspects should be afforded deference?
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