Patents by Inventor Edmund Kraft

Edmund Kraft 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).

  • Control valve device for the control of a consumer
    Patent number: 7540231
    Abstract: A control valve device (1) for the control of a dual-action consumer (2) has a control valve (3) that controls the connection of a pressure fluid line (6a) that forms the admission side of the consumer (2) with a pump and an additional pressure fluid line (6b) that forms the return side of the consumer (2) with a reservoir. A regeneration function allows the return side of the consumer (2) to be connected with the admission side of the consumer (2). The regeneration function has a short circuit device (10) located between the consumer (2) and the control valve (3). For the regeneration function, the connection of the additional pressure fluid line (6b) that forms the return side of the consumer (2) with the reservoir can be blocked by a shutoff valve device (20) located between the consumer (2) and the control valve (3).
    Type: Grant
    Filed: December 11, 2006
    Date of Patent: June 2, 2009
    Assignee: Linde Material Handling GmbH
    Inventors: Richard Hofmann, Edmund Kraft
  • Control valve device for the control of a consumer
    Publication number: 20070144164
    Abstract: A control valve device (1) for the control of a dual-action consumer (2) has a control valve (3) that controls the connection of a pressure fluid line (6a) that forms the admission side of the consumer (2) with a pump and an additional pressure fluid line (6b) that forms the return side of the consumer (2) with a reservoir. A regeneration function allows the return side of the consumer (2) to be connected with the admission side of the consumer (2). The regeneration function has a short circuit device (10) located between the consumer (2) and the control valve (3). For the regeneration function, the connection of the additional pressure fluid line (6b) that forms the return side of the consumer (2) with the reservoir can be blocked by a shutoff valve device (20) located between the consumer (2) and the control valve (3).
    Type: Application
    Filed: December 11, 2006
    Publication date: June 28, 2007
    Applicant: Linde Aktiengesellschaft
    Inventors: Richard Hofmann, Edmund Kraft
  • 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