Patents by Inventor William R. Tombs

William R. Tombs 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).

  • Power supply system for a fluorescent lamp
    Patent number: 6097162
    Abstract: A broad range of brightness in a fluorescent lamp may be achieved by applying low-frequency, pulse-width modulated voltage or current to the lamp for a low level of brightness, or high-frequency voltage or current for a high level of brightness. Switching is provided to select between the two signals.
    Type: Grant
    Filed: August 17, 1998
    Date of Patent: August 1, 2000
    Assignee: AlliedSignal Inc.
    Inventors: Ronald F. Welch, Jr., William R. Tombs, Muthu Murugan, Robert Saccomanno