Patents by Inventor Ralf Kaller

Ralf Kaller 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
    Patent number: 6039779
    Abstract: A filter element, in particular for purifying the intake air of an internal combustion engine, constituted by a non-woven fabric or paper folded in the manner of a concertina and secured as a flat plate in a frame (10). In order to increase the stability of this filter medium (11), strut segments (19, 20) are disposed on the frame, which engage in folds in the plate and are bonded thereto.
    Type: Grant
    Filed: May 7, 1998
    Date of Patent: March 21, 2000
    Assignee: Filterwerk Mann & Hummel GmbH
    Inventors: Thomas Butz, Ralf Kaller, Guenther Kissel, Gehard Mayer, Volker Koch, Werner Schnabel