Patents by Inventor Darrel B. Bryan

Darrel B. Bryan 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).

  • Two-stage pressure relief valve
    Patent number: 7165950
    Abstract: A two-stage pressure relief valve for use with hydraulic systems is disclosed. The two-stage pressure relief valve has a first stage that relieves increases in hydraulic system pressure over the normal operating pressure and up to a selected threshold pressure level, and a second stage that brings the hydraulic system pressure down to a selected reduced operating pressure that is below the normal operating pressure in response to increases in the operating pressure over the threshold pressure level.
    Type: Grant
    Filed: December 15, 2003
    Date of Patent: January 23, 2007
    Assignee: Bell Helicopter Textron Inc.
    Inventors: Carlos A. Fenny, Darrel B. Bryan, David P. Schultz