BIGGS, Circuit Judge.
In this case certain specified claims of four patents are at issue. The District Court held these claims invalid and failed to hold them infringed. All four patents relate to the manufacture of paper.
Briefly, the appellant contends as follows: That Harold R. Rafton, its assignor, invented processes or methods whereby (1) a carbonate filler can be used in the commercial manufacture of paper, the mix for which had been sized previously...
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