Patents by Inventor Harold D. Keith

Harold D. Keith 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).

  • Expansion bolt and mine roof reinforcement
    Patent number: 4954017
    Abstract: An expansion bolt, adapted to be anchored in a hole, having a hollow shank portion adapted to hold a pressurizing fluid and to expand girthwise on pressurization of the fluid, and further having a threaded portion adapted on insertion of the shank portion in the hole to extend out of the hole and to have a nut threaded thereon, whereby, following insertion of the shank portion of the bolt, in an unexpanded condition, in the hole, the shank portion may be expanded by pressurization of fluid therein for anchoring it in the hole and the nut threaded up on the threaded portion of the bolt.
    Type: Grant
    Filed: September 10, 1986
    Date of Patent: September 4, 1990
    Assignee: The Curators of the University of Missouri
    Inventors: Robert L. Davis, Harold D. Keith
  • Expansion bolt and mine roof reinforcement therewith
    Patent number: 4636115
    Abstract: An expansion bolt, adapted to be anchored in a hole, having a hollow shank portion adapted to hold a pressurizing fluid and to expand girthwise on pressurization of the fluid, and further having a threaded portion adapted on insertion of the shank portion in the hole to extend out of the hole and to have a nut threaded thereon, whereby, following insertion of the shank portion of the bolt, in an unexpanded condition, in the hole, the shank portion may be expanded by pressurization of fluid therein for anchoring it in the hole and the nut threaded up on the threaded portion of the bolt.
    Type: Grant
    Filed: November 10, 1980
    Date of Patent: January 13, 1987
    Assignee: The Curators of The University of Missouri
    Inventors: Robert L. Davis, Harold D. Keith