Patents by Inventor Robert M. Patrick

Robert M. Patrick 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).

  • Stop drop valve
    Patent number: 5323807
    Abstract: A check valve having a reduced or zero pressure drop and more particularly such a valve in combination with a spray nozzle. The check valve includes a sealed gas chamber which has within it a closed-cell foam element which insures that some gas remains in the chamber even if the primary seal fails. The new valve/nozzle combination allows valve operating pressure to be set very close to nozzle operation pressure which allows the nozzle to achieve full spray more quickly at start-up and a more immediate cessation of flow at shut off.
    Type: Grant
    Filed: August 18, 1993
    Date of Patent: June 28, 1994
    Assignee: Delavan Inc.
    Inventors: James B. Gauld, William D. Fralick, Robert M. Patrick