Patents by Inventor Roland Heidl

Roland Heidl 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: 5249637
    Abstract: A hybrid-propulsion vehicle, having one axle driven by an internal-combustion engine while the other is driven by a first electric motor. A second electric motor mounted in the vicinity of the internal-combustion engine acts as a servo motor, operating a servo pump when the vehicle is running on electric drive. When the vehicle is running via the internal-combustion engine, the servo motor acts as a generator for recharging the battery supply for the first electric motor.
    Type: Grant
    Filed: May 29, 1992
    Date of Patent: October 5, 1993
    Assignee: Audi AG
    Inventors: Roland Heidl, Franz Hasler
  • Patent number: 4781398
    Abstract: A frame unit for a vehicle having a main frame unit adapted to support the main body of the vehicle comprising a pair of structural side members and a structural cross-piece member defining an integral extension unit having an H-shaped configuration, such extension unit including means disposed at the intersections of the side members and the cross-piece member and on rearwardly disposed sections of the side members for securing the extension unit to the main frame unit of the vehicle whereby sections of the side members extend forwardly to the main frame unit and are disposed in a crumple zone of the vehicle.
    Type: Grant
    Filed: February 6, 1987
    Date of Patent: November 1, 1988
    Assignee: Audi AG
    Inventors: Manfred Uebelstadt, Peter Watzold, Roland Heidl