Patents by Inventor Niels Wahlefeld

Niels Wahlefeld 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: 8464753
    Abstract: A valve system for activating a piston of a piston-cylinder arrangement for a hydraulic or fluid device includes a pilot control valve including 3/2-way valve and a main valve arrangement having a first and a second main valve. The first and second main valves include 2/2-way valves, wherein in a first position the pilot-control valve is configured to move the first main valve into an open position so as to direct a path for a high pressure fluid to a space above the piston, and wherein in a second position the pilot-control valve is configured to connect the space to a low-pressure tank so as to relieve a pressure in the space above the piston via the second main valve, and wherein the pilot-control valve is configured to open the second main valve and configured to close the first main valve.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: June 18, 2013
    Assignee: ABB Technology AG
    Inventors: Matthias Schmidt, Niels Wahlefeld, Franz-Josef Koerber
  • Publication number: 20100243927
    Abstract: A valve system for activating a piston of a piston-cylinder arrangement for a hydraulic or fluid device includes a pilot control valve including 3/2-way valve and a main valve arrangement having a first and a second main valve. The first and second main valves include 2/2-way valves, wherein in a first position the pilot-control valve is configured to move the first main valve into an open position so as to direct a path for a high pressure fluid to a space above the piston, and wherein in a second position the pilot-control valve is configured to connect the space to a low-pressure tank so as to relieve a pressure in the space above the piston via the second main valve, and wherein the pilot-control valve is configured to open the second main valve and configured to close the first main valve.
    Type: Application
    Filed: March 12, 2010
    Publication date: September 30, 2010
    Applicant: ABB TECHNOLOGY AG
    Inventors: Niels Wahlefeld, Matthias Schmidt, Franz-Josef Koerber