BUFFINGTON, Circuit Judge.
This case, a patent one, concerns a billiard ball, which defendant makes, and which plaintiff alleges infringes its patent. The ball defendant makes, and which takes the place of the commonly used ivory billiard balls, is made of phenol and formaldehyde, and prior to the plaintiff's patent no such billiard balls were ever made or their possibility suggested. There being no such prior art, the plaintiff's assignor, Leo H. Baekeland, on July...
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