Patents by Inventor Glenn A. Graham

Glenn A. Graham 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).

  • Device to monitor movement of a surface
    Patent number: 4136556
    Abstract: A device to monitor movement of a surface such as, for example, the roof of a mine tunnel or the like and to provide an indication if that movement exceeds some predetermined creep rate or velocity. The device includes a sensing member formed of a material whose precise creep characteristics as a function of stress and strain are known. The device includes a sensing member formed of a material whose precise creep characteristics as a function of stress and strain are known.
    Type: Grant
    Filed: January 11, 1978
    Date of Patent: January 30, 1979
    Assignee: Massachusetts Institute of Technology
    Inventor: Glenn A. Graham