Patents by Inventor William Paul Coffman

William Paul Coffman 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).

  • System for accelerating relief valve opening
    Patent number: 8413677
    Abstract: A pressure relief valve control system provides a method and apparatus for rapidly closing a relief valve in response to excess fluid pressure. The system uses a programmable controller to rapidly communicate pressure changes to a solenoid actuated valve and two control valves. The solenoid actuated valve has a dedicated accumulator and the two control valves have another dedicated accumulator.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: April 9, 2013
    Assignee: Expro Americas, LLC
    Inventors: William Paul Coffman, Charles Leland Patrick