PAULINE NEWMAN, Circuit Judge.
BP Chemicals Limited filed a declaratory judgment action against Union Carbide Corporation in the United States District Court for the Southern District of New York, seeking a declaration that Union Carbide's United States Patent No. 4,543,399, issued September 24, 1985, is invalid, unenforceable, and not infringed by BP Chemicals' process for the production of certain polymers. The district court dismissed the action for lack of a justiciable...
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