Patents by Inventor Clifford A. Dupree

Clifford A. Dupree 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).

  • Patent number: 4185372
    Abstract: An axle fitting tube with a key for riding in the axle keyway includes an end for contacting a tapered sleeve at the keyway and an impact member adjacent the key to concentrate impact force on a tapered sleeve key frozen in the keyway.
    Type: Grant
    Filed: October 26, 1978
    Date of Patent: January 29, 1980
    Inventors: Clifford A. Dupree, Charles Entz