KNIGHT, Chief Judge.
This is a suit for infringement of Patent No. 2,580,762, issued January 1, 1952 to plaintiffs Joseph R. Grenier and Ernest W. Dormeyer, Jr. as joint patentees. For convenience it will be called the "Grenier" patent.
The defendant has filed its answer containing a counterclaim for a declaratory judgment that the defendant has the right to manufacture and sell the closures which the plaintiffs charge to infringe and that the Grenier patent...
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