Minnesota Mining & Mfg. Co. v. Coe

MILLER, Associate Justice.

On October 28, 1925, Klein and Brown, appellant’s predecessors in interest, applied for a patent upon a process for the manufacture of waterproof sheet abrasive material, in the nature of sandpaper. On October 9, 1928, a patent was issued to them containing four claims. Subsequent thereto Klein and Brown surrendered their patent, alleging the specification to be defective and insufficient; and on October 2, 1930, they applied for its reissue. This application, as amended, contained the original claims and several additional ones. The claims, which were the same as…