JOHNSON, District Judge.
The bill of complaint charges the defendant with infringement of letters patent No. 1,557,358, relating to a method of treating fruit for canning purposes. The plaintiff is assignee of the patent. The defendant admits infringement if the plaintiff has a valid patent, but contends that the patent is invalid.
Application for the patent in suit was filed on August 20, 1923, by the inventor, Eugene G. Grab, and letters patent No. 1,557...
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