Patents by Inventor Fritz Kupfer

Fritz Kupfer 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).

  • Filter element for cleaning a fluid
    Patent number: 7874431
    Abstract: A filter element for cleaning a fluid having a pleated filter medium designed for radial flow, to the outside of which a circumferential reinforcing thread is applied. The outside of the filter medium is divided into two axial sections, to which the reinforcing thread is applied in a plurality of circumferential thread windings, such that the axial distance between directly adjacent thread windings differs in the two sections.
    Type: Grant
    Filed: May 29, 2007
    Date of Patent: January 25, 2011
    Assignee: Mann + Hummel GmbH
    Inventors: Jobst Eisengraeber-Pabst, Joachim-Paul Krieger, Alfons Schwinghammer, Johannes Lampert, Daniela Knodel, Frank Pflueger, Fritz Kupfer
  • Filter Element for Cleaning a Fluid
    Publication number: 20070277488
    Abstract: A filter element for cleaning a fluid having a pleated filter medium designed for radial flow, to the outside of which a circumferential reinforcing thread is applied. The outside of the filter medium is divided into two axial sections, to which the reinforcing thread is applied in a plurality of circumferential thread windings, such that the axial distance between directly adjacent thread windings differs in the two sections.
    Type: Application
    Filed: May 29, 2007
    Publication date: December 6, 2007
    Applicant: Mann & Hummel GmbH
    Inventors: Jobst EISENGRAEBER-PABST, Joachim-Paul Krieger, Alfons Schwinghammer, Johannes Lampert, Daniela Knodel, Frank Pflueger, Fritz Kupfer