Patents by Inventor Walter Scott Charles

Walter Scott Charles 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).

  • Dual mode power supply
    Patent number: 6774508
    Abstract: A battery (102) powers a wireless telephone's power amplifier (106) through a Switch Mode Power Supply (SMPS) (104). The SMPS has a capacity lower than the maximum power requirements of the amplifier. When a controller (116) senses that an amplifier power-requirement threshold has been exceeded, it closes a switch (114) parallel to the SMPS, allowing power to flow from the battery to the amplifier without passing through the SMPS. This architecture allows the use of a smaller SMPS, and eliminates SMPS-generated noise to the amplifier when the amplifier is least able to tolerate such noise, namely, under high power conditions.
    Type: Grant
    Filed: July 3, 2001
    Date of Patent: August 10, 2004
    Assignee: Qualcomm Incorporated
    Inventors: Gary J. Ballantyne, Keith Bargroff, Paul L. Chan, Jonathan Klaren, Charles J. Persico, Walter Scott Charles, Somphou Sithideth
  • Dual mode power supply
    Publication number: 20030006651
    Abstract: A battery (102) powers a wireless telephone's power amplifier (106) through a Switch Mode Power Supply (SMPS) (104). The SMPS has a capacity lower than the maximum power requirements of the amplifier. When a controller (116) senses that an amplifier power-requirement threshold has been exceeded, it closes a switch (114) parallel to the SMPS, allowing power to flow from the battery to the amplifier without passing through the SMPS. This architecture allows the use of a smaller SMPS, and eliminates SMPS-generated noise to the amplifier when the amplifier is least able to tolerate such noise, namely, under high power conditions.
    Type: Application
    Filed: July 3, 2001
    Publication date: January 9, 2003
    Inventors: Gary J. Ballantyne, Keith Bargroff, Paul L. Chan, Jonathan Klaren, Charles J. Persico, Walter Scott Charles, Somphou Sithideth