Patents by Inventor Siew Yin Lee

Siew Yin Lee 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).

  • Two-way radio with improved squelch
    Patent number: 6397049
    Abstract: A two-way radio (1) that has a radio frequency receiver (2) having a modulated radio frequency signal output and a variable bandwidth filter (3) with an input coupled to the modulated radio frequency signal output. The radio (1) also has demodulator circuitry (4), a speaker (6) and processing circuitry (5). In use when the radio (1) is operating in squelch mode, the processing circuitry (5) controls the variable bandwidth filter (3) to have a first bandwidth and when in unsquelch mode the processing circuitry (5) controls the variable bandwidth filter (3) to have a second bandwidth which has a smaller frequency range and the first bandwidth.
    Type: Grant
    Filed: November 1, 1999
    Date of Patent: May 28, 2002
    Assignee: Motorola, Inc.
    Inventors: Siew Yin Lee, Chow Loong Cheah