Patents by Inventor Donald R. Roulet

Donald R. Roulet 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).

  • Pneumatic pressure regulator
    Patent number: 5694965
    Abstract: In a pneumatic pressure regulator comprising a ported housing having an internal bore, within the bore a spring-pressed piston mounted for reciprocation between advanced and retracted positions, and valve means associated with the piston and operative to direct the flow of air to the respective housing ports; the improvement comprising a housing the bore of which is inwardly tapered in the direction of spring-pressed piston retraction. This results in decreased friction, and improved hysteresis characteristics.
    Type: Grant
    Filed: March 4, 1996
    Date of Patent: December 9, 1997
    Assignee: Maverick International, Inc.
    Inventor: Donald R. Roulet