Patents by Inventor Eric Norman Griesbach

Eric Norman Griesbach 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).

  • Active vehicle suspension with a hydraulic spring
    Patent number: 6834736
    Abstract: A suspension system isolates the operator cab or seat from vibrations in the chassis of a vehicle. At least one hydraulic actuator is connected between the cab or seat and the vehicle chassis. An accumulator is coupled to the hydraulic actuator and acts as a hydraulic spring to attenuate high frequency vibrations. An electrically operable, three-position, closed-center control valve selectively connects the hydraulic actuator to a source of pressurized hydraulic fluid or a reservoir. Sensors detect acceleration and displacement of the cab or seat to which a controller responds by operating the valve. That control of the valve actively drives the hydraulic actuator to produce motion that counters the relatively low frequency vibrations from the chassis.
    Type: Grant
    Filed: December 17, 2002
    Date of Patent: December 28, 2004
    Assignee: HUSCO International, Inc.
    Inventors: Bradley James Kramer, Eric Norman Griesbach, Jeffrey A. Rogala
  • Active vehicle suspension with a hydraulic spring
    Publication number: 20040112659
    Abstract: A suspension system isolates the operator cab or seat from vibrations in the chassis of a vehicle. At least one hydraulic actuator is connected between the cab or seat and the vehicle chassis. An accumulator is coupled to the hydraulic actuator and acts as a hydraulic spring to attenuate high frequency vibrations. An electrically operable, three-position, closed-center control valve selectively connects the hydraulic actuator to a source of pressurized hydraulic fluid or a reservoir. Sensors detect acceleration and displacement of the cab or seat to which a controller responds by operating the valve. That control of the valve actively drives the hydraulic actuator to produce motion that counters the relatively low frequency vibrations from the chassis.
    Type: Application
    Filed: December 17, 2002
    Publication date: June 17, 2004
    Inventors: Bradley James Kramer, Eric Norman Griesbach, Jeffrey A. Rogala