Patents by Inventor Guido Holtmann

Guido Holtmann 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: 11255399
    Abstract: A damping valve includes a damping valve body with an annular groove which has a base and which is limited by an inner valve seat surface and an outer valve seat surface for at least one valve disk. The base of the annular groove has a maximum distance from the valve seat surface along a circumferential area and has a minimum axial distance from the valve seat surface in another circumferential area.
    Type: Grant
    Filed: March 4, 2019
    Date of Patent: February 22, 2022
    Assignee: ZF Friedrichshafen AG
    Inventors: Jörg Rösseler, Aleksandar Knezevic, Steffen Heyn, Guido Holtmann
  • Publication number: 20190285130
    Abstract: A damping valve includes a damping valve body with an annular groove which has a base and which is limited by an inner valve seat surface and an outer valve seat surface for at least one valve disk. The base of the annular groove has a maximum distance from the valve seat surface along a circumferential area and has a minimum axial distance from the valve seat surface in another circumferential area.
    Type: Application
    Filed: March 4, 2019
    Publication date: September 19, 2019
    Inventors: Jörg Rösseler, Aleksandar Knezevic, Steffen Heyn, Guido Holtmann
  • Patent number: 10253839
    Abstract: Damping valve having a damping valve body with at least one passage channel between two cover sides. An outlet opening of the passage channel leads into a cover-side annular channel which is limited by an outer annular valve support surface and by an inner annular valve support surface, the at least one annular valve support surface for at least one valve disk has a substantially constant width along the circumference, and the annular channel has a varying width along the circumference, and at least one valve support surface has a varying radius of curvature along the circumference.
    Type: Grant
    Filed: October 12, 2015
    Date of Patent: April 9, 2019
    Assignee: ZF Friedrichshafen AG
    Inventors: Guido Holtmann, Achim Eich, Jürgen Henrichs, Jörg Rösseler, Aleksander Knezevic
  • Publication number: 20170335919
    Abstract: Damping valve having a damping valve body with at least one passage channel between two cover sides. An outlet opening of the passage channel leads into a cover-side annular channel which is limited by an outer annular valve support surface and by an inner annular valve support surface, the at least one annular valve support surface for at least one valve disk has a substantially constant width along the circumference, and the annular channel has a varying width along the circumference, and at least one valve support surface has a varying radius of curvature along the circumference.
    Type: Application
    Filed: October 12, 2015
    Publication date: November 23, 2017
    Inventors: Guido HOLTMANN, Achim EICH, Jürgen HENRICHS, Jörg RÖSSELER, Aleksander KNEZEVIC
  • Patent number: 8881877
    Abstract: A vibration damper includes a cylinder in which a piston fastened to a piston rod executes a translational and a rotational movement relative to the cylinder. The piston is fixed to the piston rod by an axial fastener, and a device for preventing rotation by positive engagement is formed between the piston and the piston rod.
    Type: Grant
    Filed: May 25, 2011
    Date of Patent: November 11, 2014
    Assignee: ZF Friedrichshafen AG
    Inventors: Anton Krawczyk, Guido Holtmann, Heinz Sydekum, Uwe Herrmann, Rudolf Schulte, Jörg Rösseler, Ingo Gelhausen, Volker-Oliver Hupperich
  • Publication number: 20130228401
    Abstract: A vibration damper (1) has a sensor device (27), including a cylinder (3) which is filled with damping medium and in which a piston rod (5) is guided so as to be axially movable, wherein the vibration damper has a compensation chamber (13) which receives at least the damping medium volume displaced by the piston rod, wherein the sensor device has a first sensor component (29) which is stationary with respect to the cylinder and has a component (17) which carries out a movement synchronous with the piston rod, wherein a floating body (17) floats on a damping medium surface (19), and the floating body constitutes the sensor component that carries out a movement synchronous with the piston rod.
    Type: Application
    Filed: November 17, 2011
    Publication date: September 5, 2013
    Applicant: ZF Friedrichshafen AG
    Inventors: Burkhard Bender, Wolfgang Hertz, Guido Holtmann
  • Publication number: 20110290605
    Abstract: A vibration damper includes a cylinder in which a piston fastened to a piston rod executes a translational and a rotational movement relative to the cylinder. The piston is fixed to the piston rod by an axial fastener, and a device for preventing rotation by positive engagement is formed between the piston and the piston rod.
    Type: Application
    Filed: May 25, 2011
    Publication date: December 1, 2011
    Applicant: ZF Friedrichshafen AG
    Inventors: Anton KRAWCZYK, Guido Holtmann, Heinz Sydekum, Uwe Herrmann, Rudolf Schulte, Jörg Rösseler, Ingo Gelhausen, Volker-Oliver Hupperich