Patents by Inventor Stuart A. Evans

Stuart A. Evans 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).

  • Pneumatically controlled air motor
    Patent number: 4870891
    Abstract: A double acting piston and cylinder air motor with pneumatically actuated pilot valves for shifting a directional control valve, where the pilot valves are controlled by pilot ports in the cylinder as they are uncovered by the piston.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: October 3, 1989
    Assignee: Stewart Warner Corporation
    Inventors: Jerry D. Shew, Stuart A. Evans