Patents by Inventor Ronald H. Crawford

Ronald H. Crawford 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).

  • Pressure regulating device with damping means for preventing valve chatter
    Patent number: 4340085
    Abstract: A pressure regulating device comprises a chamber (22) for receiving fluid under pressure and a valve (23) associated therewith, arranged to open at a preset fluid pressure in the chamber.In order to prevent any valve "chatter", the valve (23) comprises a valve disc (8), a bushing (9) on which the valve disc is freely mounted for sliding movement thereon, a valve seat (13) associated with the disc, and means (3) to bias the disc towards the seat against the fluid pressure, the disc and bushing being connected together by means of a flexible coupling (10) having resilient properties to accommodate the sliding movement of the disc.
    Type: Grant
    Filed: April 22, 1980
    Date of Patent: July 20, 1982
    Inventors: Ronald H. Crawford, Alan W. Kent
  • Medical face mask
    Patent number: D277513
    Type: Grant
    Filed: March 8, 1982
    Date of Patent: February 5, 1985
    Inventors: David E. J. Parsons, Paul D. O'Reilly, Ronald H. Crawford