Patents by Inventor Thomas E. Shrader

Thomas E. Shrader has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Soapstone sharpener
    Patent number: 4065887
    Abstract: A soapstone sharpener for providing a fine marking edge on the stone, the sharpener being comprised of an elongated member having facing legs forming a V-shape in cross section and having abrasive material secured on the inner faces of the legs to form inner abrading surfaces of V-shaped cross section. The soapstone is rubbed on the abrasive material within the V-shaped cross section to form the soapstone so as to be complementary to the V and have a fine marking edge.
    Type: Grant
    Filed: March 10, 1976
    Date of Patent: January 3, 1978
    Inventor: Thomas E. Shrader