Patents by Inventor Charles Philip Smith

Charles Philip Smith 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).

  • Hydraulic actuating arrangements
    Patent number: 3992979
    Abstract: A hydraulic actuator arrangement has a pair of double acting actuator devices coupled together for movement in unison. Each device has two control valves respectively operable to cause the device to move in opposite directions. The four control valves are resiliently coupled so that both actuator devices are normally energised simultaneously. Each control valve has an associated pressure relief valve so that failure of any one of the control valves permits the pressures on either side of the associated actuator device to be equalized.
    Type: Grant
    Filed: December 20, 1974
    Date of Patent: November 23, 1976
    Assignee: Joseph Lucas (Industries) Limited
    Inventor: Charles Philip Smith