Patents by Inventor Gerhard Preine

Gerhard Preine 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).

  • Slide valve for controlling a bridging clutch in an automatic transmission
    Patent number: 5518091
    Abstract: A slide valve for controlling a torque converter bridging clutch for an automatic transmission of a motor vehicle includes a slide housing and a movable control slide by which hydraulic fluid connections and ports may be connected to each other in different ways. The slide includes a first control flange for alternatively or jointly controlling closing and opening lines leading to the converter bridging clutch. To ensure optimal regulation of the converter bridging clutch, the slide has a second control flange for selectively connecting the opening line to a drain port so that the hydraulic fluid can flow continually through the converter bridging clutch to remove heat.
    Type: Grant
    Filed: December 2, 1993
    Date of Patent: May 21, 1996
    Assignee: Volkswagen AG
    Inventors: Georg Kruse, Gerhard Preine, Ulrich Remmlinger, Volker Pichmann
  • Slide for a slide valve, and method for the manufacture thereof
    Patent number: 5248126
    Abstract: A slide for a slide valve consists of an injection-molded, glass fiber reinforced, mineral-filled thermoplastic material having a high thermal stability of shape, a compressive strength of not less than 110 MPa and a Rockwell hardness of not less than R-117. The only machined surfaces are ground peripheral surfaces forming the sealing surfaces of the several subdivisions of the slide, which have an intact homogeneous texture.
    Type: Grant
    Filed: September 11, 1992
    Date of Patent: September 28, 1993
    Assignee: Volkswagen A.G.
    Inventors: Ludwig Pruss, Gerhard Preine