Patents by Inventor Doyle Sumrall

Doyle Sumrall 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).

  • Hinged member for a rear impact guard
    Patent number: 6109675
    Abstract: A horizontal impact member for use with a rear impact guard on a semi-trailer truck is disclosed. The horizontal impact member is connected to a standard rear impact guard by a hinge. This design is for use with a liftgate that is mounted to the rear of the semi-trailer truck. As the liftgate travels in a downwardly vertical direction it contacts the horizontal member which rotates along its hinge point. The addition of a roller to the horizontal member reduces the amount of wear upon the horizontal member and the liftgate.
    Type: Grant
    Filed: June 23, 1998
    Date of Patent: August 29, 2000
    Assignee: Waltco Truck Equipment Co.
    Inventor: Doyle Sumrall