Patents by Inventor Edwin Woldenberg

Edwin Woldenberg 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).

  • Process for foaming thermoplastic polycarbonates
    Patent number: 5308558
    Abstract: A process for producing foamed articles containing thermoplastic aromatic polycarbonates is disclosed. Accordingly, thermoplastic aromatic polycarbonates are mixed with about 0.01 to 10% by weight of Al.sub.2 O.sub.3 (H.sub.2 O).sub.3 and the mixture is either extruded in an extruder at temperatures from 220.degree. C. to 320.degree. C. without application of a vacuum to produce foamed molded articles or it is injection molded in injection molding machines without application of vacuum at temperatures from 290.degree. C. to 330.degree. C. to produce molded foam articles.
    Type: Grant
    Filed: August 13, 1993
    Date of Patent: May 3, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Edwin Woldenberg, Klaus Kircher, Klaus Horn, Johann Piontek, Burkhard Kohler, Wolfgang Ebert
  • Foamed polyethylene films
    Patent number: 4273880
    Abstract: A process for the production of foamed films of polyethylene or ethylene vinyl acetate copolymers using metal salts of aliphatic fatty acids as additives.
    Type: Grant
    Filed: July 19, 1979
    Date of Patent: June 16, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wichard Pump, Wolfgang Becker, Edwin Woldenberg