Patents Examined by Minh Deu A
  • Programmable waveform for lamp ballast
    Patent number: 7170697
    Abstract: A programmable waveform ballast has a power supply and a waveform generator. The power supply provides, from a power source, a variable power to a discharge lamp. The waveform generator is coupled to the power supply and is programmable to produce a plurality of waveforms. The waveform generator controls the power supply to apply the variable power to the discharge lamp in accordance with a programmed waveform.
    Type: Grant
    Filed: October 29, 2004
    Date of Patent: January 30, 2007
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Michael A. Pate, James R Cole, Peter Guy Howard