Patents by Inventor Bert Klesczewski

Bert Klesczewski 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 producing polyurethane flexible foamed materials having low bulk density
    Publication number: 20080207791
    Abstract: Mechanically compressible polyurethane foamed materials with low bulk density are produced by reacting a polyol component satisfying specified compositional requirements with an isocyanate component that includes a modified toluene diisocyanate. The polyurethane foamed materials produced are useful as acoustic and thermal insulation.
    Type: Application
    Filed: February 20, 2008
    Publication date: August 28, 2008
    Inventors: Bert Klesczewski, Manduela Otten, Bernd Dohmen
  • Process for the preparation of PIPA polyols for the production of highly elastic flexible polyurethane foams
    Publication number: 20080167394
    Abstract: The present invention relates to PIPA polyols, to a process for the preparation of these PIPA polyols, and to a process for the production of highly elastic flexible polyurethane foams from these PIPA polyols.
    Type: Application
    Filed: December 18, 2007
    Publication date: July 10, 2008
    Inventors: Peter Haas, Bert Klesczewski, Sven Meyer-Ahrens
  • Process for the preparation of PIPA polyols
    Publication number: 20070238796
    Abstract: The present invention describes a process for the preparation of PIPA polyols and their use for the production of flexible polyurethane foams.
    Type: Application
    Filed: October 18, 2006
    Publication date: October 11, 2007
    Inventors: Catherine Lovenich, Hans Hettel, Bert Klesczewski, Christel Fussangel
  • Ballast and process for the production of ballast
    Publication number: 20070172590
    Abstract: The present invention relates to ballast which have a high stability and a long service life and to a process for the production of ballast. These ballast are suitable for railway track laying and road construction and dike systems used for example in costal protection. These ballast comprise ballast stones and polyurethane foams based on a reaction mixture of selected polyisocyanates and selected compounds with isocyanate-reactive groups.
    Type: Application
    Filed: January 17, 2007
    Publication date: July 26, 2007
    Inventors: Andreas Hoffmann, Heinz-Dieter Ebert, Bert Klesczewski
  • Pur-polyester flexible foams based on polyetheresterpolyols
    Publication number: 20070010593
    Abstract: The present invention relates to polyetheresterpolyols which have a hydroxyl number of from 60 to 160 and a viscosity of ?500 mPas at 75° C. These polyetheresterpolyols contain repeat units derived from I) aliphatic polycarboxylic acids, II) polyols having a hydroxyl number greater than 550 mg KOH/g, and III) polyols containing ether groups and having a hydroxyl number less than 120 mg KOH/g.
    Type: Application
    Filed: July 3, 2006
    Publication date: January 11, 2007
    Inventors: Hartmut Nefzger, Bert Klesczewski, Eva Pischedda, Manduela Otten
  • Process for the preparation of polyether polyols
    Patent number: 6776925
    Abstract: The present invention relates to a process for the production of polyether polyols by polyaddition of alkylene oxides onto starter compounds containing active hydrogen atoms conducted in the presence of a double-metal cyanide catalyst wherein a reaction mixture is guided at least once through a zone which has an energy density of at least 105 J/m3 and wherein the residence time of the reaction mixture in this zone is at least 10−6 seconds per pass.
    Type: Grant
    Filed: February 19, 2002
    Date of Patent: August 17, 2004
    Assignees: Bayer Aktiengesellschaft, Bayer Polymers LLC
    Inventors: Jörg Hofmann, Stephan Ehlers, Bernd Klinksiek, Lars Obendorf, Christian Steinlein, Bert Klesczewski, Jose F. Pazos
  • Process for producing polyether polyols
    Patent number: 6670406
    Abstract: The present invention relates to a process for the production of a polyether polyol by polyaddition of an alkylene oxide onto a starter compound containing active hydrogen atoms conducted in the presence of a double metal cyanide catalyst comprising conducting a reaction mixture at least once through a zone which has an energy density of at least 5×106 J/m3, wherein the dwell time of the reaction mixture in this zone is at least 10−6 seconds per pass.
    Type: Grant
    Filed: February 19, 2002
    Date of Patent: December 30, 2003
    Assignees: Bayer Aktiengesellschaft, Bayer Polymers LLC
    Inventors: Jörg Hofmann, Stephan Ehlers, Bernd Klinksiek, Bert Klesczewski, Christian Steinlein, Lars Obendorf, Harald Pielartzik, Jose F. Pazos
  • Process for producing polyether polyols
    Publication number: 20020198278
    Abstract: The present invention relates to a process for the production of a polyether polyol by polyaddition of an alkylene oxide onto a starter compound containing active hydrogen atoms conducted in the presence of a double metal cyanide catalyst comprising conducting a reaction mixture at least once through a zone which has an energy density of at least 5×106 J/m3, wherein the dwell time of the reaction mixture in this zone is at least 10−6 seconds per pass.
    Type: Application
    Filed: February 19, 2002
    Publication date: December 26, 2002
    Inventors: Jorg Hofmann, Stephan Ehlers, Bernd Klinksiek, Bert Klesczewski, Christian Steinlein, Lars Obendorf, Harald Pielartzik, Jose F. Pazos
  • Process for the preparation of polyether polyols
    Publication number: 20020169229
    Abstract: The present invention relates to a process for the production of polyether polyols by polyaddition of alkylene oxides onto starter compounds containing active hydrogen atoms conducted in the presence of a double-metal cyanide catalyst wherein a reaction mixture is guided at least once through a zone which has an energy density of at least 105 J/m3 and wherein the residence time of the reaction mixture in this zone is at least 10−6 seconds per pass.
    Type: Application
    Filed: February 19, 2002
    Publication date: November 14, 2002
    Inventors: Jorg Hofmann, Stephan Ehlers, Bernd Klinksiek, Lars Obendorf, Christian Steinlein, Bert Klesczewski, Jose F. Pazos
  • Open-cell rigid polyurethane foams
    Patent number: 6444720
    Abstract: Open-cell rigid foams containing urethane and/or isocyanurate and/or urea groups are produced with a long-chain polyether polyol having low double bond content.
    Type: Grant
    Filed: October 18, 2001
    Date of Patent: September 3, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bert Klesczewski, Jörg Hofmann, Pramod Gupta