Patents by Inventor Paul Schelbert

Paul Schelbert 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).

  • Polyhydroxyl-compositions derived from castor oil with enhanced reactivity suitable for polyurethane-synthesis
    Patent number: 6897283
    Abstract: A reactive polyester polyol is described that is obtainable by half ester formation starting from at least one dicarboxylic anhydride and at least one hydroxyl group carrying, saturated or unsaturated fatty acid and/or a respective ester, in particular castor oil and/or ricinoleic acid, as well as final esterification by at least one polyol.
    Type: Grant
    Filed: July 30, 2001
    Date of Patent: May 24, 2005
    Assignee: Sika Schweiz AG
    Inventors: Ulrich Gerber, Werner Meyer, Paul Schelbert
  • Polyhydroxyl-compositions derived from castor oil with enhanced reactivity suitable for polyurethane-synthesis
    Publication number: 20020035235
    Abstract: A reactive polyester polyol is described that is obtainable by half ester formation starting from at least one dicarboxylic anhydride and at least one hydroxyl group carrying, saturated or unsaturated fatty acid and/or a respective ester, in particular castor oil and/or ricinoleic acid, as well as final esterification by at least one polyol.
    Type: Application
    Filed: July 30, 2001
    Publication date: March 21, 2002
    Inventors: Ulrich Gerber, Werner Meyer, Paul Schelbert
  • Kind of polyhydroxyl compounds suitable for the polyurethane synthesis
    Patent number: 5877255
    Abstract: A binder producible by reaction of aromatic polyesters with polyols and fatty acid esters as well as a process for the production of such a binder are described.The inventive binder is particularly suitable for the production of polyurethanes and results in floor coverings with especially favorable properties.
    Type: Grant
    Filed: March 26, 1997
    Date of Patent: March 2, 1999
    Assignee: Sika AG vorm. kaspar Winkler & Co.
    Inventors: Ulrich Gerber, Paul Schelbert, Werner Meyer