Patents Assigned to Sonca Industries Ltd.
  • 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