Patents by Inventor Tandrea Lea Sperfslage

Tandrea Lea Sperfslage 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).

  • Hydrostatic transmission
    Patent number: 7739870
    Abstract: A transmission for a vehicle includes a fixed displacement pump operable to produce a high pressure flow and a fixed displacement motor. A fluid flow path is disposed between the pump and the motor. The fluid flow path is integrated into a housing containing at least one of the pump and the motor. A single control valve controls the direction and the speed of the motor.
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: June 22, 2010
    Assignee: Briggs and Stratton Corporation
    Inventors: Robert Carlson, Thomas D. Blum, Tandrea Lea Sperfslage