Patents by Inventor Barrie Drew

Barrie Drew 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).

  • High efficiency 4-lamp instant start ballast
    Patent number: 7132803
    Abstract: An instant-start ballast for a multiple gas discharge lamp fixture has a single half-bridge inverter that is used to drive at least two series resonant output circuits. Each series resonant output circuit is used to drive two gas discharge lamps. A single output voltage limiting circuit is provided with a microprocessor that monitors the combined output voltages of the series resonant output circuits and uses a single voltage limiting transistor to control the output voltages of the circuits. A capacitor is associated with each gas discharge lamp socket in the fixture such that a voltage across the capacitor indicates that a lamp has been installed in the socket associated with the capacitor. The ignition sequence will only be initiated if the capacitor voltages indicate that a lamp has been installed in each socket of a fixture.
    Type: Grant
    Filed: December 3, 2004
    Date of Patent: November 7, 2006
    Assignee: Universal Lighting Technologies, Inc.
    Inventors: Peter Shackle, John Jay Dernovsek, Barrie Drew, Qinghong Yu
  • High efficiency 4-lamp instant start ballast
    Publication number: 20050168164
    Abstract: An instant-start ballast for a multiple gas discharge lamp fixture has a single half-bridge inverter that is used to drive at least two series resonant output circuits. Each series resonant output circuit is used to drive two gas discharge lamps. A single output voltage limiting circuit is provided with a microprocessor that monitors the combined output voltages of the series resonant output circuits and uses a single voltage limiting transistor to control the output voltages of the circuits. A capacitor is associated with each gas discharge lamp socket in the fixture such that a voltage across the capacitor indicates that a lamp has been installed in the socket associated with the capacitor. The ignition sequence will only be initiated if the capacitor voltages indicate that a lamp has been installed in each socket of a fixture.
    Type: Application
    Filed: December 3, 2004
    Publication date: August 4, 2005
    Inventors: Peter Shackle, John Dernovsek, Barrie Drew, Qinghong Yu
  • Fishing rod and fish strike alert
    Patent number: D911484
    Type: Grant
    Filed: May 6, 2019
    Date of Patent: February 23, 2021
    Inventor: Barry Drew Nelson