Patents by Inventor Herbert Witossek

Herbert Witossek 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).

  • Preparation of aliphatic oligocarbonate diols
    Patent number: 7420077
    Abstract: The present invention relates to an improved process for preparing aliphatic oligocarbonate diols by transesterifying dimethyl carbonate (DMC) with aliphatic diols.
    Type: Grant
    Filed: May 21, 2007
    Date of Patent: September 2, 2008
    Assignee: Bayer MaterialScience AG
    Inventors: Steffen Hofacker, Rolf Bachmann, Lothar Bäcker, Herbert Witossek
  • Preparation of aliphatic oligocarbonate polyols
    Patent number: 7317121
    Abstract: The present invention relates to an improved process for preparing aliphatic oligocarbonate polyols by transesterifying dimethyl carbonate (DMC) with an aliphatic polyol component.
    Type: Grant
    Filed: September 15, 2004
    Date of Patent: January 8, 2008
    Assignee: Bayer MaterialScience AG
    Inventors: Steffen Hofacker, Herbert Witossek, Lothar Bäcker
  • Preparation of aliphatic oligocarbonate diols
    Publication number: 20070219388
    Abstract: The present invention relates to an improved process for preparing aliphatic oligocarbonate diols by transesterifying dimethyl carbonate (DMC) with aliphatic diols.
    Type: Application
    Filed: May 21, 2007
    Publication date: September 20, 2007
    Inventors: Steffen Hofacker, Rolf Bachmann, Lothar Backer, Herbert Witossek
  • Preparation of aliphatic oligocarbonate diols
    Patent number: 7238825
    Abstract: The present invention relates to an improved process for preparing aliphatic oligocarbonate diols by transesterifying dimethyl carbonate (DMC) with aliphatic diols.
    Type: Grant
    Filed: September 15, 2004
    Date of Patent: July 3, 2007
    Assignee: Bayer MaterialScience AG
    Inventors: Steffen Hofacker, Rolf Bachmann, Lothar Bäcker, Herbert Witossek
  • Process for producing aliphatic oligocarbonate diols
    Patent number: 7112693
    Abstract: The present invention relates to a process for producing an aliphatic oligocarbonate diol comprising a) reacting an aliphatic diol with dimethyl carbonate at an elevated pressure in a reaction mixture, and b) subsequently removing unreacted methanol and dimethyl carbonate under a reduced pressure to uncap the terminal OH groups.
    Type: Grant
    Filed: December 12, 2003
    Date of Patent: September 26, 2006
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jörg Tillack, Jörg Laue, Herbert Witossek, Andreas Schlemenat
  • Preparation of aliphatic oligocarbonate diols
    Publication number: 20050065360
    Abstract: The present invention relates to an improved process for preparing aliphatic oligocarbonate diols by transesterifying dimethyl carbonate (DMC) with aliphatic diols.
    Type: Application
    Filed: September 15, 2004
    Publication date: March 24, 2005
    Inventors: Steffen Hofacker, Rolf Bachmann, Lothar Backer, Herbert Witossek
  • Preparation of aliphatic oligocarbonate polyols
    Publication number: 20050065359
    Abstract: The present invention relates to an improved process for preparing aliphatic oligocarbonate polyols by transesterifying dimethyl carbonate (DMC) with an aliphatic polyol component.
    Type: Application
    Filed: September 15, 2004
    Publication date: March 24, 2005
    Inventors: Steffen Hofacker, Herbert Witossek, Lothar Backer
  • Method for producing aliphatic oligocarbonate diols
    Patent number: 6833433
    Abstract: A process for the production of aliphatic oligocarbonate diols is disclosed. The optionally catalyzed high yield process entails the multistage transesterification of aliphatic diols with dimethyl carbonate. In the process DMC-methanol mixtures that have been distilled off are recycled to the reaction solution with further conversion and depletion of the contained DMC in the same or in a following reaction batch.
    Type: Grant
    Filed: December 4, 2002
    Date of Patent: December 21, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Andreas Schlemenat, Jörg Tillack, Jörg Laue, Herbert Witossek
  • Process for producing aliphatic oligocarbonate diols
    Patent number: 6818784
    Abstract: The present invention relates to a process for producing an aliphatic oligocarbonate diol comprising a) reacting an aliphatic diol with dimethyl carbonate at an elevated pressure in a reaction mixture, and b) subsequently removing unreacted methanol and dimethyl carbonate under a reduced pressure to uncap the terminal OH groups.
    Type: Grant
    Filed: June 26, 2002
    Date of Patent: November 16, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jörg Tillack, Jörg Laue, Herbert Witossek, Andreas Schlemenat
  • Process for producing aliphatic oligocarbonate diols
    Publication number: 20040143130
    Abstract: The present invention relates to a process for producing an aliphatic oligocarbonate diol comprising a) reacting an aliphatic diol with dimethyl carbonate at an elevated pressure in a reaction mixture, and b) subsequently removing unreacted methanol and dimethyl carbonate under a reduced pressure to uncap the terminal OH groups.
    Type: Application
    Filed: December 12, 2003
    Publication date: July 22, 2004
    Inventors: Jorg Tillack, Jorg Laue, Herbert Witossek, Andreas Schlemenat
  • Radiation-hardening coating compositions
    Patent number: 6753394
    Abstract: The invention relates to new, low viscosity radiation-hardenable urethane acrylates prepared from oxalkylated polyols with 25 to 75 mole % of a polyol having a degree of oxalkylation between 3 and 5 and 75 to 25 mole % of a polyol having a degree of oxalkylation between 8 and 25, the resulting coatings having improved abrasion resistance, as well as their use as coating compositions, in particular for flooring materials.
    Type: Grant
    Filed: September 4, 2002
    Date of Patent: June 22, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jan Weikard, Wolfgang Fischer, Manfred Müller, Thomas Fäcke, Herbert Witossek
  • Radiation-hardening coating compositions
    Publication number: 20030050390
    Abstract: The invention relates to new, low viscosity radiation-hardenable urethane acrylates prepared from oxalkylated polyols with 25 to 75 mole % of a polyol having a degree of oxalkylation between 3 and 5 and 75 to 25 mole % of a polyol having a degree of oxalkylation between 8 and 25, the resulting coatings having improved abrasion resistance, as well as their use as coating compositions, in particular for flooring materials.
    Type: Application
    Filed: September 4, 2002
    Publication date: March 13, 2003
    Inventors: Jan Weikard, Wolfgang Fischer, Manfred Muller, Thomas Facke, Herbert Witossek
  • Process for producing aliphatic oligocarbonate diols
    Publication number: 20030009047
    Abstract: The present invention relates to a process for producing an aliphatic oligocarbonate diol comprising a) reacting an aliphatic diol with dimethyl carbonate at an elevated pressure in a reaction mixture, and b) subsequently removing unreacted methanol and dimethyl carbonate under a reduced pressure to uncap the terminal OH groups.
    Type: Application
    Filed: June 26, 2002
    Publication date: January 9, 2003
    Inventors: Jorg Tillack, Jorg Laue, Herbert Witossek, Andreas Schlemenat