Patents by Inventor Earl W. Keyser

Earl W. Keyser 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).

  • Abrasive relief device for the foot
    Patent number: 4246914
    Abstract: A bar defining a flat base and a surface having a longitudinal flat center section merging bilaterally into curved sections which extend to the edges of the base, the surface of the bar is divided into an abrasive and a nonabrasive portion.
    Type: Grant
    Filed: January 10, 1979
    Date of Patent: January 27, 1981
    Inventor: Earl W. Keyser