Patents by Inventor David C. Liber

David C. Liber 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).

  • Mine roof bearing plate
    Patent number: 4507020
    Abstract: An improved bearing plate is used to support a portion of a mine roof. The bearing plate is stamped from sheet metal and has elongated ribs which define grooves facing toward a back side of the bearing plate. Reinforcing members are disposed in the grooves and are fixedly connected to the bearing plate. The reinforcing members increase the resistance of the bearing plate to deflection under the influence of loads applied to the bearing plate by the mine roof.
    Type: Grant
    Filed: May 10, 1983
    Date of Patent: March 26, 1985
    Assignee: Die-Matic Corporation
    Inventors: Louie Zeitler, David C. Liber