NIELDS, District Judge.
This is the usual patent infringement suit. Plaintiff charges defendant with infringement of a patent to George A. Chapman and John W. Littleford, No. 1,968,008, issued July 24, 1934, upon application filed March 26, 1929, for "Concentration of Minerals." Plaintiff's ownership is proved by assignment from the inventors to Minerals Separation North American Corporation and by assignment by that corporation to the plaintiff. The sole defense...
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