Patents by Inventor Walter Kirsch

Walter Kirsch 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).

  • Valve system
    Patent number: 8464758
    Abstract: The invention relates to a valve arrangement with a continuously variable directional control valve, wherein the valve slide thereof can be adjusted in the direction of five positions in order to control a user in two directions, to carry out a quick motion, to switch into a floating position or to close off the pressure means connection to the user (neutral position).
    Type: Grant
    Filed: November 8, 2008
    Date of Patent: June 18, 2013
    Assignee: Robert Bosch GmbH
    Inventors: Alfred Breunig, Josef Hessdoerfer, Walter Kirsch
  • VALVE SYSTEM
    Publication number: 20100269935
    Abstract: The invention relates to a valve arrangement with a continuously variable directional control valve, wherein the valve slide thereof can be adjusted in the direction of five positions in order to control a user in two directions, to carry out a quick motion, to switch into a floating position or to close off the pressure means connection to the user (neutral position).
    Type: Application
    Filed: November 8, 2008
    Publication date: October 28, 2010
    Inventors: Alfred Breunig, Josef Hessdoerfer, Walter Kirsch
  • Pipe breakage safety valve
    Patent number: 6027095
    Abstract: The invention is a pipe rupture valve having an internal servovale that comprises a valve piston that, in a setting at a steering edge, blocks the connection between two internal pressure connections of the servovalve. At a distance axially to said steering edge the valve piston has an additional steering edge that separates, sealed against fluids, a pre-loaded spring of the valve piston (or a spring area accommodating this spring) from the pressure connections.
    Type: Grant
    Filed: September 23, 1997
    Date of Patent: February 22, 2000
    Assignee: Mannesman Rexroth AG
    Inventors: Edmund Kraft, Gunter Fertig, Walter Kirsch