Patents by Inventor Michael Y. S. Chan

Michael Y. S. 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).

  • Conductive touch pad with capacitive blocking filter
    Patent number: 5499026
    Abstract: A touch sensitive pad consists of a number of electrical conductive pads (10) surrounded by a conductive pad (11). Each pad (10) is connected via a respective capacitive blocking filter to a multiplexer (13) and an oscillator (14). When the touch pad is touched directly to effectively bridge between one of the pads (10) and the surrounding pad (11), a change in effective impedance is detected by a resultant variation in the frequency of the oscillator (14).
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: March 12, 1996
    Assignee: Varitronix Limited
    Inventors: York Liao, Michael Y. S. Chan