Patents by Inventor Frederick J. M. Griggs

Frederick J. M. Griggs 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).

  • Vibration testing apparatus
    Patent number: 4489612
    Abstract: Vibration testing apparatus comprises a vibration generator coupled to a horizontal slip plate by means of a driver bar, having limbs which embrace opposite sides of the slip plate. The lower limb of the driver bar is separable from the remainder of the driver bar so as to enable the vibration generator and the remainder of the driver bar to be pivoted away from the slip plate without lateral displacement of the slip plate along its horizontal axis.
    Type: Grant
    Filed: May 9, 1983
    Date of Patent: December 25, 1984
    Assignee: Ling Dynamic Systems Limited
    Inventor: Frederick J. M. Griggs