Patents by Inventor Gareth A. Keith

Gareth A. Keith 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 actuator apparatus
    Patent number: 4741247
    Abstract: The apparatus disclosed herein provides controlled operation of a pneumatic actuator by effecting charging and discharging of the actuator through an intermediate step volume, the pressure in the step volume being regulated as a respective function of the existing pressure in the actuator during charging and discharging.
    Type: Grant
    Filed: September 17, 1986
    Date of Patent: May 3, 1988
    Assignee: Rexa Corporation
    Inventors: J. Robert Glomeau, Gareth A. Keith
  • Variable force actuator
    Patent number: 4050670
    Abstract: An actuator for reciprocating stem control valves having a linkage system affording variable force, reversible action, and adaptability to different valve strokes.
    Type: Grant
    Filed: February 5, 1976
    Date of Patent: September 27, 1977
    Assignee: Masoneilan International, Inc.
    Inventors: Karl S. Borg, Gareth A. Keith