Patents by Inventor John E. Levreault

John E. Levreault 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).

  • Remote turn-on circuit for automobile audio amplifier
    Patent number: 6556683
    Abstract: A system for installing a radio audio amplifier in a vehicle at a location remote from the vehicle radio. The system senses voltage in the radio speaker wires to turn the amplifier on and off.
    Type: Grant
    Filed: January 7, 1999
    Date of Patent: April 29, 2003
    Inventor: John E. Levreault
  • Amplifying with cascaded class B amplifiers
    Patent number: 4454480
    Abstract: An electronic Class B master power amplifier is cascaded with a like slave Class B electronic power amplifier between ground and an output terminal to which the output of the slave amplifier is connected. A first pair of D.C. sources deliver potentials of magnitude V.sub.ss but opposite polarity to the master power amplifier and each have a reference terminal connected to ground. A second pair of D.C. sources deliver potentials of magnitude V.sub.ss but opposite polarity to the slave power amplifier, and each have a reference terminal connected to the outupt of the master amplifier. A common input signal to be amplified is delivered to the inputs of the master and slave amplifiers.
    Type: Grant
    Filed: July 15, 1981
    Date of Patent: June 12, 1984
    Inventors: Lars P. Allfather, John E. Levreault