Patents by Inventor Herbert Hunzelmann

Herbert Hunzelmann 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).

  • Heat exchanger having a welded pipe which has a reduced wall thickness at location of the weld seam
    Patent number: 5669440
    Abstract: A heat exchanger, produced by the insertion of welded pipes into a rib pack, has a good connection between the rib pack and the pipes after expansion of the pipes. An optimal contact of the pipes against the passages in the cooling fins of the rib pack is achieved because the weld base of the welded pipe lies in a recess. The recess is formed by reduction of the wall thickness of a strip material from which the welded pipe is produced.
    Type: Grant
    Filed: December 22, 1995
    Date of Patent: September 23, 1997
    Assignee: BEHR GmbH & Co.
    Inventors: Dieter Bauer, Ralf Bochert, Herbert Damsohn, Werner Helms, Roland Hemminger, Herbert Hunzelmann, Volker Kurz, Roland Schirrmacher, Walter Wolf