Patents by Inventor Leander L. Keller

Leander L. Keller 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).

  • Improved self-grinding valve
    Patent number: 4465091
    Abstract: An improved, motorized Lunkenheimer valve is provided having two independently actuated drive means for operating the valve, one of which moves the valve stem and disc longitudinally along the axis of the stem and the other of which rotates the stem and disc about the longitudinal axis of the stem. The two drive means can be operated concurrently to effect more rapid opening or closing, and countercurrently to provide a continuous grinding operation when the valve is in the closed position.
    Type: Grant
    Filed: September 20, 1982
    Date of Patent: August 14, 1984
    Assignee: Kaiser Aluminum & Chemical Corporation
    Inventor: Leander L. Keller