Patents by Inventor Siegfried Weis

Siegfried Weis 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).

  • Biodegradable polymers based on natural and renewable raw materials especially isosorbite
    Patent number: 6342300
    Abstract: The invention relates to biodegradable polycondensates, to the production of said polycondensates, and to their use for releasing specific substances. The polycondensates are derived from at least three components chosen from the following group: a) dianhydrohexites b) bivalent (polyvalent) organic carboxylic acids and c) polyvalent organic carboxylic acids which, in addition to two carboxylic acid functions, have at least one other, optionally capped, i.e., OH and/or COOH function.
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: January 29, 2002
    Assignee: Celanese Ventures GmbH
    Inventors: Holger Bengs, Alex Schoenfeld, Gitte Boehm, Siegfried Weis, Joachim Clauss
  • Foamable molding compositions
    Patent number: 5786397
    Abstract: Molding compositions or mixtures comprising a high-temperature-resistant polymer and at least one polymer containing sulfoxide groups are used for the production of a foam by exposure to heat. The foam is employed for heat-resistant insulating layers.
    Type: Grant
    Filed: July 29, 1997
    Date of Patent: July 28, 1998
    Assignee: Hoechst Aktinegesellschaft
    Inventors: Helmut Scheckenbach, Axel Schonfeld, Siegfried Weis
  • Polyamide foams and process for their production
    Patent number: 5760147
    Abstract: A molding composition or mixture comprising a polyamide and at least one polymer containing sulfoxide groups serves for the production of a foam material by the action of heat. The foam material is used for moldings and heat-resistant insulation layers.
    Type: Grant
    Filed: April 18, 1996
    Date of Patent: June 2, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Axel Schonfeld, Georg Frank, Andreas Schleicher, Helmut Scheckenbach, Siegfried Weis
  • Foamable molding compositions
    Patent number: 5708041
    Abstract: Molding compositions or mixtures comprising a high-temperature-resistant polymer and at least one polymer containing sulfoxide groups are used for the production of a foam by exposure to heat. The foam is employed for heat-resistant insulating layers.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: January 13, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Helmut Scheckenbach, Axel Schonfeld, Siegfried Weis