ARCHER, Circuit Judge.
IPC Limited Partnership and International Packing Corp. (IPC) appeal from the judgment of the United States District Court for the Eastern District of Michigan, holding U.S. Patent 3,498,621 ('621) owned by Dana Corporation (Dana) valid, enforceable and willfully infringed by IPC and awarding damages to Dana.
Background
The '621 patent, entitled "Valve Stem Seal," issued to R...
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