Patents by Inventor Shui Chang

Shui Chang 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).

  • Automatic controller of the master gas switch
    Patent number: 4783600
    Abstract: An automatic controller for a master gas switch includes a timer for keeping the switch opened for a selectable time. The controller includes an electrical motor for rapidly closing the switch. The motor is responsive to two conditions: When the timer reaches the end of a selectable time, it energizes the motor to cause the gas switch to close. Secondly, a flame induction rod monitors a gas burner flame, and when the flame stops, such rod causes a relay to close and energize the motor for gas switch closure.
    Type: Grant
    Filed: October 6, 1986
    Date of Patent: November 8, 1988
    Inventor: Shui Chang