Patents by Inventor Douglas M. Thornton

Douglas M. Thornton 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).

  • Monitor for double safety valves
    Patent number: 4542767
    Abstract: A safety monitor for a dual valve of the type that provides a malfunction signal when one of the valve members of the dual valve is not in its intended position. The monitor comprises a simple pressure sensing device that senses the pressure downstream of the inlet valve element of each of the valve members for sensing when a pressure exists downstream of the valve element.
    Type: Grant
    Filed: April 5, 1983
    Date of Patent: September 24, 1985
    Assignee: Ross Operating Valve Company
    Inventors: Douglas M. Thornton, Logan H. Mathis
  • Electrical terminal construction
    Patent number: 4349176
    Abstract: A construction for the housing of a unit which has a pair of male supply terminals and a differently oriented male ground terminal, which precludes improper mating and potential shock hazard. The construction comprises a shroud surrounding the housing surface from which the terminals protrude and which corresponds to the female outlet housing contour and thus permits insertion of the terminals in only the correct position.
    Type: Grant
    Filed: February 19, 1980
    Date of Patent: September 14, 1982
    Assignee: Ross Operating Valve Company
    Inventor: Douglas M. Thornton
  • Port thread
    Patent number: 4033615
    Abstract: A method and construction for the formation of an internal thread for fluid or other ports which may receive NPT, BSP tapered, or BSP parallel external threads. The port configuration varies with different nominal tube bore diameters, but comprises one or more of the following:Adjustment of tooth form.Adjustment of pitch.A tapered entry and parallel inner portion.The invention applied at least to nominal diameters between 1/8 and 11/2inches.
    Type: Grant
    Filed: June 16, 1975
    Date of Patent: July 5, 1977
    Assignee: Ross Operating Valve Company
    Inventors: Raymond A. Miller, Jr., Douglas M. Thornton