MARKEY, Chief Judge. Appeal from a judgment of the District Court for the Northern District of Ohio holding U.S. Patents 3,953,566 (’566) and 4,187,390 (’390) invalid. We affirm in part, reverse in part, and remand for a determination of the infringement issue. Background Tape of unsintered polytetrafluorethy-lene (PTFE) (kn…
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