Patents by Inventor Ulf Pfeifer

Ulf Pfeifer 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).

  • Regeneratable particle filter for waste gases
    Patent number: 4975099
    Abstract: The particle filter for waste gases includes a porous filter body traversed by honeycomb-form channels and resistance heating elements for burning-off of soot particles. The resistance heating elements are in a zone adjacent an entry end of the filter body and include perforated strips of sheet metal including longitudinal strips which are bent into U-shaped heat conductors. Cross strips create, on destruction of individual heat conductors, an electrical current detour path. The resistance heating elements are inexpensive to produce and easy to install.
    Type: Grant
    Filed: November 14, 1989
    Date of Patent: December 4, 1990
    Assignee: Voest-Alpine Automotive Gesellschaft m.b.H.
    Inventors: Arthur Kaser, Ulf Pfeifer