MEMORANDUM AND ORDER
KEETON, District Judge.
This is an action for patent infringement filed by Pharmacia, Inc. and Dr. Endre Balazs against Frigitronics, Inc., Precision-Cosmet, Inc. and Med-Chem Products, Inc. on June 20, 1984. The application for the patent at issue, United States Patent No. 4,141,973 (hereinafter "the '973 patent"), was originally filed on October 17, 1975 and covers ultrapure hyaluronic acid. In defense, defendant Med-Chem asserts ...
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