Patents by Inventor Gregory Colin Truman

Gregory Colin Truman 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).

  • Methods of controlling the brightness of a glow discharge
    Patent number: 6087786
    Abstract: Methods of controlling the brightness of a glow discharge which switches from a low brightness state to a high brightness state a given time after the start of an excitation pulse are described. In the first method, conventional pulse duration modulation produces a dimming ratio much greater than the ratio of duty factor variation. In the second method, a plurality of sets of pulses having different fixed durations but variable repetition rates are employed. In the third method, a plurality of sets of pulses having different relative durations have their pulse durations modulated in synchrony.
    Type: Grant
    Filed: December 24, 1998
    Date of Patent: July 11, 2000
    Assignee: Central Research Laboratories Limited
    Inventors: Philip Charles Allen, Andrew David Barnes, Ian Gordon Gibb, Alan Cooper Sharp, Steven Edward Coe, Gregory Colin Truman