Mr. Justice Brandéis delivered the opinion of the Court. The Permutit Company is the owner of Gans Patent No. 1,195,923, for an apparatus for softening water, applied for August 5, 1911 and granted August 22, 1916. It brought, on February 23, 1928, 'this suit in the federal court for northern Illinois, against Graver Corporation, to enjoin infringement of Claims…
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