MEMORANDUM OPINION
ROTH, District Judge:
General Electric Company ("GE") charges in this suit that Hoechst Celanese Corporation ("HCC") and Celanese Engineering Resins, Inc. ("CER") have infringed GE's U.S. Patent No. 3,953,394 ("'394 Patent"). The patent, asserting forty claims, covers a plastic made of a mixture of polyethylene terephthalate ("PET") and polybutylene terephthalate ("PBT"). HCC and CER answered and counterclaimed for a declaration of noninfringement...
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