Patents by Inventor Alvin J. DuVal

Alvin J. DuVal 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).

  • Multipurpose prying tool
    Patent number: 4433463
    Abstract: A flat strip of metal formed as an expandible wedge having an inside triangular space bounded by jaws that correspond to the beveled sides of the wedge and a rear portion that corresponds to the thick end of the wedge opposite from its apex. The apex ends of the jaws are sharpened. A shaft extends through a hole in the rear portion of the wedge and has an eccentric inside of the triangular space. The shaft has a projection that is larger than the hole and can be reciprocated for the projection to drive the wedge and can be turned for the eccentric to spread the jaws.
    Type: Grant
    Filed: September 13, 1982
    Date of Patent: February 28, 1984
    Assignee: William Diedrich
    Inventor: Alvin J. DuVal