CHOY, Circuit Judge:
This appeal concerns the validity of patent No. 2,807,659, a tube shield and insert designed for protecting glass electron tubes. Cool-Fin Electronics Corporation (Cool-Fin), a now defunct manufacturer of tube shields, originally sued the International Electronic Research Corporation (IERC) for violations of the antitrust laws. IERC counterclaimed that Cool-Fin had infringed its patent. The district court tried the patent issue separately and...
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