STARR, Chief Judge.
In its complaint in this case plaintiff alleged that it manufactured and sold piston rings known as Chrome Oil Stopper rings, which defendant claimed infringed its patent No. 2,565,042 issued August 21, 1951, on application filed May 17, 1948. Plaintiff denied that its rings infringed defendant's patent and alleged that all claims of the patent were invalid. It asked for a declaratory judgment (28 U.S.C.A. §§ 2201, 2202) determining defendant...
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