Patents by Inventor John C. Moyers

John C. Moyers 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 and apparatus for monitoring armature position in direct-current solenoids
    Patent number: 5583434
    Abstract: A method for determining the position of an armature of a dc-powered solenoid. Electrical circuitry is provided to introduce a small alternating current flow through the coil. As a result, the impedance and resistance of the solenoid coil can be measured to provide information indicative of the armature's position.
    Type: Grant
    Filed: July 20, 1993
    Date of Patent: December 10, 1996
    Assignee: Martin Marietta Energy Systems, Inc.
    Inventors: John C. Moyers, Howard D. Haynes
  • Method and system for measuring gate valve clearances and seating force
    Patent number: 5487302
    Abstract: Valve clearances and seating force, as well as other valve operational parameters, are determined by measuring valve stem rotation during opening and closing operations of a translatable gate valve. The magnitude of the stem rotation, and the relative difference between the stem rotation on opening and closing provides valuable data on the valve internals in a non-intrusive manner.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: January 30, 1996
    Assignee: Lockheed Martin Energy Systems, Inc.
    Inventors: Donald A. Casada, Howard D. Haynes, John C. Moyers, Brian K. Stewart