Patents by Inventor Hoi-Shing Lee

Hoi-Shing 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).

  • Intensity control of fluorescent lamps
    Patent number: 4150323
    Abstract: A control circuit for a battery-operated fluorescent lamp has a transistorized inverter which acts as a blocking oscillator. Lamp intensity is controlled by applying an adjustable bias, either automatic or manual, to the base of the blocking oscillator transistor.
    Type: Grant
    Filed: September 27, 1976
    Date of Patent: April 17, 1979
    Assignee: Sonca Industries Ltd.
    Inventors: Warner S. Yeh, Hoi-Shing Lee