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Chicago IP Litigation Tracking Northern District of Illinois IP Cases

Tag Archives: Reduction to Practice

Reduction to Practice is a Question of Disputed Fact

Posted in Summary Judgment

Tellabs Ops., Inc. v. Fujitsu Ltd., No. 08 C 3379, Slip Op. (N.D. Ill. Jul. 27, 2012) (Holderman, C.J.). 

Chief Judge Holderman denied plaintiff Tellabs’ motion for summary judgment of invalidity.  As an initial matter, there was a question of fact regarding whether defendant Fujitsu could swear behind Tellabs’ prior art references based upon an alleged reduction to practice.  The Court could not determine based upon undisputed facts or as a matter of law whether or when Fujitsu reduced its invention to practice.