OPINION
SUE L. ROBINSON, Chief Judge.
I. INTRODUCTION
On August 15, 2000, plaintiff Eaton Corporation ("Eaton") filed this action against defendant Parker-Hannifin Corporation ("Parker") alleging willful infringement of claims 7 through 11 of U.S. Patent No. 5,226,682 (the "'682 patent"). (D.I. 1) Parker answered the complaint on January 22, 2001, asserting non-infringement and invalidity of the '682 patent. (D.I. 7) On
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