Patents by Inventor John E. Levreault, Jr.

John E. Levreault, Jr. 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).

  • Patent number: 5848168
    Abstract: An active noise conditioning system for use with a combustion engine exhaust system is provided. A controller receives an exhaust noise signal, along with various other feedback signals for producing an anti-noise signal in response to the input signals. An amplifier is provided for receiving and amplifying the anti-noise signal. A wave generator receives the amplified anti-noise signal and generates an audio anti-noise signal. The output of the wave generator is collocated with the exhaust pipe of the exhaust system, where the audio anti-noise signal and the exhaust noise are acoustically coupled, which effects cancelling of the exhaust noise.
    Type: Grant
    Filed: November 4, 1996
    Date of Patent: December 8, 1998
    Assignee: Tenneco Automotive Inc.
    Inventors: J. Clay Shipps, John E. Levreault, Jr.