Patents by Inventor Harold D. Chadwick

Harold D. Chadwick 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).

  • Head-gauge/tank-bladder
    Patent number: 5293780
    Abstract: A head-gauge/tank-bladder device for measuring the pressure of liquid within a tank. The invention provides for measuring the tank pressure while maintaining the gauge isolated form the liquid within the tank. The invention is connects a gauge to a fluid filled tank through at least one threaded connection. On the other end of the tube, a bladder is attached. A liquid contained within the tubing transmits the tank fluid pressure to the gauge.
    Type: Grant
    Filed: April 21, 1992
    Date of Patent: March 15, 1994
    Inventors: Harold D. Chadwick, William Kingsley