Patents by Inventor Douglas R. Garrett

Douglas R. Garrett 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 controlled hydrant valve coupler
    Patent number: 3971405
    Abstract: A pressure controlled hydrant valve coupler characterized in that the main pilot operated pressure control valve and the excess flow servo valve are embodied in the coupler housing. The coupler herein is further characterized in that the pilot operated pressure control valve has associated therewith a fast closing valve and a surge control valve.
    Type: Grant
    Filed: July 15, 1974
    Date of Patent: July 27, 1976
    Assignee: Parker-Hannifin Corporation
    Inventors: James S. Millar, Douglas R. Garrett