This is a patent infringement suit involving patent No. 2,078,056, issued April 20, 1937 to Everett Chapman and thereafter assigned to the plaintiff. In addition to the usual defenses of invalidity and non-infringement the defendant pleaded estoppel, and by counterclaim asserted that the patent was held upon a constructive trust. By agreement the issues raised by the estoppel defense and the counterclaim...
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