Patents by Inventor Robert E. Diffenderfer

Robert E. Diffenderfer 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).

  • Curb box
    Patent number: 4308886
    Abstract: A curb box for underground gas and water services formed of a synthetic plastic material wherein the lower portion of the curb box is formed with a bell housing for receiving a service or distribution line valve. The bell housing includes valve engaging surfaces frictionally contacting the valve wherein such frictional engagement initially positions the valve upon the curb box and resists inadvertent displacement between the valve and curb box during installation, back filling and settling.
    Type: Grant
    Filed: November 27, 1979
    Date of Patent: January 5, 1982
    Assignee: Handley Industries, Inc.
    Inventors: Edward W. Handley, Richard E. Hammond, Robert E. Diffenderfer