Patents by Inventor Heinz Liesenfeld

Heinz Liesenfeld 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).

  • System for venting the heating pipes of a tubular rotary dryer
    Patent number: 4045881
    Abstract: Air is vented from steam-charged heating pipes of a tubular rotary dryer via connector pipes and a collecting pipe which is disposed circumferentially around the dryer drum. Holding blocks provided with inwardly-biased rollers support the collecting pipe for longitudinal movement on the exterior wall of the dryer drum.
    Type: Grant
    Filed: July 25, 1975
    Date of Patent: September 6, 1977
    Assignee: Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
    Inventors: Bernd Brandt, Peter Jansen, Heinz Liesenfeld