Patents by Inventor Waldemar Friesenhahn

Waldemar Friesenhahn 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).

  • Publication number: 20100051255
    Abstract: The invention relates to a heat exchanger, particularly for a motor vehicle, comprising a housing (2) with a connection (4) for the inlet or outlet of a first fluid, wherein the first fluid can flow through the housing (2), and wherein exchange means (1) are disposed in the housing (2), the second fluid flowing through these means, wherein the first fluid flows through a control member (7), by means of which the flow of the first fluid can be varied, wherein the connection (4) has a molding (6) for retaining the control member (7).
    Type: Application
    Filed: November 6, 2007
    Publication date: March 4, 2010
    Applicants: BEHR GMBH & CO. KG, BEHR THERMOT-TRONIK GMBH
    Inventors: Karsten Emrich, Heinz Czemmel, Waldemar Friesenhahn, Timm Roeschmann
  • Patent number: 6644619
    Abstract: An improved housing for a thermostatic valve has a nonconducting cover that features a projection into the interior of the valve housing. Mounted on the projection is a thermostatic operating element, which operates to control the valve when wax inside the thermostatic operating element is heated. A pair of electrical leads, connectable to an exterior power source, are embedded within the cover, extending through the projection and connecting to a heating element within the thermostatic operating element. When electrical current is applied to the heating element through the embedded electrical leads, the wax is heated, thereby expanding, driving a work piston of the thermostatic operating element, and opening the valve.
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: November 11, 2003
    Assignee: Behr Thermot-Tronik GmbH
    Inventors: Waldemar Friesenhahn, Barbu Frunzetti, Wolfgang Richter
  • Patent number: 6601544
    Abstract: In a thermoset valve for a cooling circuit of an internal combustion engine of the type having a housing (11) containing a thermostatic operating element (10) whose piston (12) actuates a valve element (13), a base plate (17) is affixed to the housing (11) and supports a fixed abutment (25) for a restoring spring (24) which loads the valve element (13).
    Type: Grant
    Filed: July 3, 2001
    Date of Patent: August 5, 2003
    Assignee: Behr Thermot-Tronik GmbH
    Inventors: Waldemar Friesenhahn, Ulrich Dehnen, Barbu Frunzetti
  • Publication number: 20020070367
    Abstract: An improved housing for a thermostatic valve has a nonconducting cover that features a projection into the interior of the valve housing. Mounted on the projection is a thermostatic operating element, which operates to control the valve when wax inside the thermostatic operating element is heated. A pair of electrical leads, connectable to an exterior power source, are embedded within the cover, extending through the projection and connecting to a heating element within the thermostatic operating element. When electrical current is applied to the heating element through the embedded electrical leads, the wax is heated, thereby expanding, driving a work piston of the thermostatic operating element, and opening the valve.
    Type: Application
    Filed: October 26, 2001
    Publication date: June 13, 2002
    Inventors: Waldemar Friesenhahn, Barbu Frunzetti, Wolfgang Richter
  • Publication number: 20020059906
    Abstract: In a thermoset valve for a cooling circuit of an internal combustion engine of the type having a housing (11) containing a thermostatic operating element (10) whose piston (12) actuates a valve element (13), a base plate (17) is affixed to the housing (11) and supports a fixed abutment (25) for a restoring spring (24) which loads the valve element (13).
    Type: Application
    Filed: July 3, 2001
    Publication date: May 23, 2002
    Inventors: Waldemar Friesenhahn, Ulrich Dehnen, Barbu Frunzetti