ANDERSON, Circuit Judge:
The complaint in this action charged the defendants with patent infringement and unfair competition. Federal jurisdiction was based on 28 U.S.C. § 1338(a) and (b). During pre-trial discovery it became apparent that the patent asserted in the suit was invalid but the defendants wanted the patent issue to remain in the case in order that judgment might be rendered on their counterclaim for invalidity. At the trial the plaintiff offered...
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