Patents by Inventor Rolf Duerrstein

Rolf Duerrstein 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).

  • Four-way exhaust gas valve
    Patent number: 9074522
    Abstract: A four-way exhaust gas valve has a permanent inlet, a permanent outlet, a selectable inlet, a selectable outlet and a pivotable valve flap. The pivotable valve flap is arranged for switching between a first mode of operation, in which exhaust gas entering through the permanent inlet is guided directly to the permanent outlet, and a second mode of operation, in which exhaust gas entering through the permanent inlet is discharged through the selectable outlet and exhaust gas re-entering through the selectable inlet is discharged through the permanent outlet.
    Type: Grant
    Filed: August 23, 2013
    Date of Patent: July 7, 2015
    Assignee: EBERSPAECHER EXHAUST TECHNOLOGY GMBH & CO. KG
    Inventors: Denis Scholt, Christoph Illi, Rolf Duerrstein, Georg Wirth
  • Four-Way Exhaust Gas Valve
    Publication number: 20140053549
    Abstract: A four-way exhaust gas valve has a permanent inlet, a permanent outlet, a selectable inlet, a selectable outlet and a pivotable valve flap. The pivotable valve flap is arranged for switching between a first mode of operation, in which exhaust gas entering through the permanent inlet is guided directly to the permanent outlet, and a second mode of operation, in which exhaust gas entering through the permanent inlet is discharged through the selectable outlet and exhaust gas re-entering through the selectable inlet is discharged through the permanent outlet.
    Type: Application
    Filed: August 23, 2013
    Publication date: February 27, 2014
    Applicant: Eberspaecher Exhaust Technology GmbH & Co. KG
    Inventors: Denis Scholt, Christoph Illi, Rolf Duerrstein, Georg Wirth
  • Filter system for the lubricant of an internal combustion engine
    Patent number: 6126818
    Abstract: A filter system, in particular for filtering the lubricant of an internal combustion engine, having at least two filter elements (19, 25) which can be connected successively to the oil circuit and a changeover valve (21) which feeds the oil to be cleaned to one of the filter elements, with the valve (21) being operated by the pressure difference between the clean oil side and the raw oil side of a filter element (19, 25, 26).
    Type: Grant
    Filed: September 12, 1997
    Date of Patent: October 3, 2000
    Assignee: Filterwerk Mann & Hummel GmbH
    Inventors: Rolf Duerrstein, Goetz Frhr. von Esebeck, Robert Ostertag, Rene Reif, Martin Weindorf
  • Internal-combustion engine with independent module subassembly
    Patent number: 5887562
    Abstract: An internal-combustion engine has an oil pump, preferably also the cooling water pump, assigned to an independent module which can be mounted separately.
    Type: Grant
    Filed: July 22, 1997
    Date of Patent: March 30, 1999
    Assignees: Daimler-Benz AG, Filterwerk Mann & Hummel GmbH
    Inventors: Goetz Freiherr von Esebeck, Rolf Duerrstein, Martin Weindorf
  • Filter assembly including a reinforced radial seal
    Patent number: 5736040
    Abstract: A filter arrangement formed with a housing and a center tube connected with the housing. In the filter arrangement, a metal-free filter cartridge is arranged which includes an accordion-folded, annular filter element. The filter cartridge is provided with end plates on the axial end faces of the annular filter element, at least one of the end plates having an elastic construction, and each elastic end plate is provided with a flexible supporting ring which is arranged directly adjacent a radial seal formed by the elastic end plate.
    Type: Grant
    Filed: October 27, 1994
    Date of Patent: April 7, 1998
    Inventors: Rolf Duerrstein, Hans Erdmannsdoerfer, Bruno Sommer, Helmut Storz