Patents by Inventor Natalja Zubritskaya

Natalja Zubritskaya 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 the preparation of 2-aminomethyl-1,5-pentanediamine
    Publication number: 20010005764
    Abstract: The present invention relates to a process for the preparation of 2-aminomethyl-1,5-pentanediamine by simultaneously reacting 2,4-dicyano-1-butene, hydrogen and ammonia in one step without isolation of 2-amino-methyl-1,5-pentanedinitrile; the products are useful as an intermediate in the production of coating compositions, surfactants, detergents and as a component of epoxide compositions.
    Type: Application
    Filed: February 1, 2000
    Publication date: June 28, 2001
    Inventors: Konrad Fischer, Frank Richter, Anatoly Bazanov, Alexandre Timofeev, Natalja Zubritskaya, Galina Smirnova
  • Process for the preparation of diaminodipropyl ethers and hydroxyaminodipropyl ethers
    Patent number: 5900510
    Abstract: Diaminodipropyl ethers and hydroxyaminodipropyl ethers are prepared by catalytic amination of dipropylene glycol.
    Type: Grant
    Filed: September 26, 1997
    Date of Patent: May 4, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Helmut Waldmann, Klaus Nachtkamp, Josef Pedain, Anatoly Bazanov, Alexandre Timofeev, Natalja Zubritskaya, Gennady Terechtchenko
  • Process for the preparation of 2-methyl-2,4-diaminopentane
    Patent number: 5801285
    Abstract: The present invention relates to a process for preparing 2-methyl-2,4-diaminopentane by introducing acetone, ammonia and hydrogen into a two-zone reactor at a temperature of 20.degree. to 130.degree. C. and a pressure of 30 to 250 bar, wherein the first zone contains a cationic exchange resin containing NH.sub.4.sup..sym. groups or an aluminum oxide and/or silicon oxide catalyst and the second zone contains a hydrogenation catalyst containing nickel.
    Type: Grant
    Filed: October 31, 1997
    Date of Patent: September 1, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Helmut Waldmann, Jurgen Dahmer, Anatoly Bazanov, Alexandre Timofeev, Natalja Zubritskaya, Gennady Terechtchenko
  • Process for the preparation of 1,4-bis(aminomethyl) cyclohexane
    Patent number: 5789620
    Abstract: The present invention relates to a process for preparing 1,4-bis(aminomethyl)cyclohexane by reacting a 40 to 80 wt. % aqueous solution of 1,4-bis(hydroxymethyl)cyclohexane with a mixture of hydrogen and ammonia in the presence of a nickel/copper/chromium catalyst at a pressure of 100 to 250 bar and a temperature of 150.degree. to 250.degree. C.
    Type: Grant
    Filed: October 31, 1997
    Date of Patent: August 4, 1998
    Assignee: Bayer Aktiengesellschaft
    Inventors: Helmut Waldmann, Jurgen Dahmer, Klaus Nachtkamp, Anatoly Bazanov, Alexandre Timofeev, Natalja Zubritskaya, Gennady Terechtchenko