Patents by Inventor John L. Crewse

John L. Crewse 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).

  • Patent number: 4154495
    Abstract: A clip for securing a detachable electrical plug and cable assembly in an electrical receptacle having a hinged cover plate. The clip has first and second body members; means for securement of the first body member to the electrical plug and cable assembly; means for rotatably attaching the second body member relative the first body member; and biasing means integral with the first or second body members for pressing an adapted end of the second body member against the outside suface of the cover plate and bias the cover towards a closed position such that at least a portion of the inside surface of the cover plate presses against the plug to secure the electrical plug and cable assembly against relative movement with the receptacle. The first and second body members of the clip are preferably made from metallic wire or plate, but may be made from polymeric materials or combinations of polymeric and metallic materials.
    Type: Grant
    Filed: October 26, 1977
    Date of Patent: May 15, 1979
    Assignee: Samuel Moore and Company
    Inventor: John L. Crewse
  • Patent number: 4070947
    Abstract: A springless impact device including a piston-cylinder mechanism having at least one preselected coacting port and passageway operatively connected to a valve pressurized fluid control apparatus which selectively feeds and exhausts pressurized fluid to and from the device in a predetermined manner. There is an area differential between the top and bottom ends of the piston head. The device includes an inverted "U"-shaped seal ring on the piston head which functions as a one-way check valve to effect piston reciprocation in coaction with the area differential on the piston head.
    Type: Grant
    Filed: July 22, 1976
    Date of Patent: January 31, 1978
    Assignee: The Cleveland Vibrator Company
    Inventor: John L. Crewse