Patents by Inventor Ralph Appelt

Ralph Appelt 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: 6976665
    Abstract: An electromagnetically actuatable valve for hydraulic control devices in motor vehicles is embodied as a pressure-equalized seat valve in a mode of construction comprising a hydraulic part with a valve dome and an electrical part that can be slipped onto the valve dome. In a magnet valve that is normally open, the tubular tappet that supports the closing member is supported at one point in a first bearing point, in terms of the longitudinal direction, that is embodied as a slide bearing, and a bearing ring that forms the sealing point accomplishes the hydraulic pressure equilibrium with the effective sealing diameter of the closing member that together with the valve seat forms the second bearing point. With the valve, very short switching times, in particular less than 0.5 ms, can be achieved with an economical mode of construction.
    Type: Grant
    Filed: May 12, 2004
    Date of Patent: December 20, 2005
    Assignee: Robert Bosch GmbH
    Inventors: Stefan Seitz, Andreas Schrade, Guenther Schnalzger, Hubert Hueber, Martin Kirschner, Ralph Appelt
  • Publication number: 20040227398
    Abstract: An electromagnetically actuatable valve for hydraulic control devices in motor vehicles is embodied as a pressure-equalized seat valve in a mode of construction comprising a hydraulic part with a valve dome and an electrical part that can be slipped onto the valve dome. In a magnet valve that is normally open, the tubular tappet that supports the closing member is supported at one point in a first bearing point, in terms of the longitudinal direction, that is embodied as a slide bearing, and a bearing ring that forms the sealing point accomplishes the hydraulic pressure equilibrium with the effective sealing diameter of the closing member that together with the valve seat forms the second bearing point. With the valve, very short switching times, in particular less than 0.5 ms, can be achieved with an economical mode of construction.
    Type: Application
    Filed: May 12, 2004
    Publication date: November 18, 2004
    Inventors: Stefan Seitz, Andreas Schrade, Guenther Schnalzger, Hubert Hueber, Martin Kirschner, Ralph Appelt