Patents by Inventor Gregory T. B. Crowley

Gregory T. B. Crowley 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).

  • Brightness control circuit for C.R.T.
    Patent number: 4970444
    Abstract: A cathode ray tube brightness control circuit includes a resistor bridge network in one arm of which is a controlled voltage level point and the other arm of which includes a brightness adjustment potentiometer. A negative feedback amplifier has its input connected to the voltage level point and its output to one end of the bridge across which a brightness control voltage supply is connected. The voltage of the supply may be adjusted to vary the range of brightness control.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: November 13, 1990
    Assignee: U.S. Philips Corporation
    Inventor: Gregory T. B. Crowley
  • Dynamic focus circuit
    Patent number: 4891564
    Abstract: A dynamic beam current focussing circuit for providing improved focussing across the screen of a cathode ray video display tube utilizes a tuned voltage step-up transformer to achieve sufficient amplitude of horizontal sweep waveform components of the dynamic focussing voltage. The circuit is useful for high definition television and video display units.
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: January 2, 1990
    Assignee: U.S. Philips Corporation
    Inventor: Gregory T. B. Crowley