Patents by Inventor Chor Fai Wong

Chor Fai Wong 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).

  • System for maintaining thermal stability of a motion stage
    Patent number: 8324848
    Abstract: A system for maintaining thermal stability of a motion stage driven by a motor comprises a motion current generator operative to produce a motion current to drive the motion stage to move and a thermal current generator operative to produce a thermal current to dissipate heat in the motion stage for controlling a temperature of the motion stage without producing corresponding movement of the motion stage. A summation controller is operative to combine the motion current with the thermal current, and to produce a combined current output to the motor.
    Type: Grant
    Filed: February 5, 2009
    Date of Patent: December 4, 2012
    Assignee: ASM Assembly Automation Ltd
    Inventors: Gary Peter Widdowson, Wai Chuen Gan, Cheuk Wah Tang, Chor Fai Wong
  • SYSTEM FOR MAINTAINING THERMAL STABILITY OF A MOTION STAGE
    Publication number: 20100194328
    Abstract: A system for maintaining thermal stability of a motion stage driven by a motor comprises a motion current generator operative to produce a motion current to drive the motion stage to move and a thermal current generator operative to produce a thermal current to dissipate heat in the motion stage for controlling a temperature of the motion stage without producing corresponding movement of the motion stage. A summation controller is operative to combine the motion current with the thermal current, and to produce a combined current output to the motor.
    Type: Application
    Filed: February 5, 2009
    Publication date: August 5, 2010
    Inventors: Gary Peter WIDDOWSON, Wai Chuen Gan, Cheuk Wah Tang, Chor Fai Wong