Patents by Inventor John Campbell Clark

John Campbell Clark 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).

  • Method of and apparatus for sensing strain in strained members
    Patent number: 4114429
    Abstract: The strain in a member is sensed by a strain sensitive device mounted on mounting block means which when fixedly secured to the member include a removable template.
    Type: Grant
    Filed: September 13, 1976
    Date of Patent: September 19, 1978
    Assignee: Coal Industry (Patents) Limited
    Inventor: John Campbell Clark
  • Mooring device
    Patent number: 3992934
    Abstract: A mooring device having a pivotal joint which is subjected to shear strain or stress at a pin when in use. The pin is provided with at least one region having a cross section with a diameter smaller than that of the bearing surface of the pin. At least one pair of strain sensors is mounted in this region, and these are connected in an electrical circuit capable of indicating shear strain due to force applied to the pin. The pin is provided with means for keeping the plane of action of the strain sensors aligned substantially in the direction of any resultant applied force which produces the shear strain or stress.
    Type: Grant
    Filed: April 21, 1975
    Date of Patent: November 23, 1976
    Assignee: Strainstall Limited
    Inventor: John Campbell Clark