In re Swenson

Jackson, Judge,

delivered tbe opinion of the court:

Appellants on November 13,1934 filed their application in the United States Patent Office for a patent for new and useful improvements in a process for treating mineral substances and for the resultant product.

The Primary Examiner succinctly described the alleged invention as follows:

The alleged invention relates to a method of coloring roofing granules, which are to be used for covering asphalt coated roofing. The granules, which are sand, slate or other stone, are coated with a ceramic glaze composition containing a chromate or dichromate…