DYK, Circuit Judge.
Appellants Fresenius USA, Inc. and Fresenius Medical Care Holdings, Inc. (collectively, "Fresenius") brought a declaratory judgment action against Baxter International, Inc., and Baxter Healthcare Corporation (collectively, "Baxter"), alleging, inter alia, that claims 26-31 of U.S. Patent No. 5,247,434 ("the '434 patent") were invalid and not infringed. Baxter counterclaimed for infringement. The district
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