Patents by Inventor Heung K. Tsang

Heung K. Tsang 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).

  • Toneless telemetry in a wireless system
    Patent number: 7206591
    Abstract: The present invention is directed to indoor/outdoor wireless communication systems and methods. Communications between an indoor unit and outdoor unit do not require telemetry tones. The input DC voltage level from the indoor unit is reduced to a level below the normal operating range for the outdoor unit. This is recognized by the outdoor unit as a signal to start receiving telemetry data, which is sent from the indoor unit to the outdoor unit by modulating the transmit signal.
    Type: Grant
    Filed: August 12, 2004
    Date of Patent: April 17, 2007
    Assignee: Xytrans, Inc.
    Inventors: Danny F. Ammar, Heung K. Tsang