Patents by Inventor Wai Y. Chan

Wai Y. Chan 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 mode selection in a controller for grading implements
    Publication number: 20020154948
    Abstract: A method is disclosed for a controller to automatically switch to an alternative control mode to control the height of a grading implement when the output of a positioning sensor is not available. According to the invention, the controller recognizes sensor unavailability and automatically switches to an alternative operating mode to maintain control. In one alternative operating mode, the controller recognizes sensor unavailability and automatically routes the control signal from the unaffected side to the control channel for the affected side. In another alternative operating mode, the controller monitors the current value of an additional sensor for an alternative mode of control until one of the primary sensors becomes unavailable, and then automatically switches to the alternative mode for the affected side, using the last known value for the alternative mode as the set point.
    Type: Application
    Filed: January 17, 2001
    Publication date: October 24, 2002
    Applicant: TOPCON LASER SYSTEMS, INC.
    Inventors: Vernon J. Brabec, Wai Y. Chan, Raymond O'Connor