Silica Products Co. v. Haydite Co.

WHAM, District Judge.

The bill of complaint charges an infringement by the defendants of claims 1 to 6 and 10 and 11 of United States patent No. 1,314,752, issued to Oscar Olsen on September 2, 1919, upon his application filed May 22, 1918. The complainant is the assignee of the Olsen patent. The Olsen patent is entitled “Burned Shale and Method of Preparing The Same and Concrete Made Therefrom.” Two of the objects of the invention are set forth in the patent as follows:

“Another object of the invention is to provide a light, inert material highly resistant to stresses to take the place of the…