PROST, Circuit Judge.
This is a patent infringement action in which Union Carbide Chemicals & Plastics Technology Corporation and Union Carbide Corporation (collectively "Union Carbide") brought suit against Shell Oil Company, Shell Chemical Company, and CRI Catalyst Company (collectively "Shell") for infringement of various claims of Union Carbide's U.S. Patents Nos. 4,916,243 ("the '243 patent"), 4,908,343 ("the '343 patent"), and 5,057,481 ("the '481 patent...
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