BUFFINGTON, Circuit Judge.
In the court below the plaintiff, assignee of patent No. 1,748,335, to Eliot Farley and Nathaniel R. Landon, for method of treating coal and product thereof, brought suit against the defendant charging infringement of the five claims thereof. That court held the fifth claim, to wit, the method of restoring the luster and improving appearance of discolored coal, which comprises treating it with oxalic acid, valid and infringed. Thereupon...
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