Patents by Inventor Shek Michael Cheung

Shek Michael Cheung 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).

  • Servo-actuator with fail safe means
    Patent number: 5899064
    Abstract: The present invention provides a servo-actuator capable of operating in both the Fail Safe and Fail Operate modes. In the Fail Safe mode, a pretensioned spring member moves a jet pipe in the servo-valve to cause said actuator rod to move in a first direction upon loss of electric power. A mechanical feedback means coupled to said spring member and said actuator rod opposes the force applied by the spring so that when a force equilibrium is reached the actuator rod will be at a predetermined position.
    Type: Grant
    Filed: October 9, 1997
    Date of Patent: May 4, 1999
    Assignee: AlliedSignal Inc.
    Inventor: Shek Michael Cheung