Patents by Inventor Hugh E. Sutherland

Hugh E. Sutherland 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).

  • Security system
    Patent number: 4333074
    Abstract: A security system in which a predetermined combination can be set by a operator to disable the system. An audible alarm is sounded when the entered combination differs from the correct combination by an error outside prescribed limits and a secondary alarm given when the error is within the limits.
    Type: Grant
    Filed: March 5, 1980
    Date of Patent: June 1, 1982
    Assignee: Southwater Security Limited
    Inventors: Hugh E. Sutherland, Philip J. Spiegelhalter, Martin R. Spiegelhalter, Brian H. Goring