Patents by Inventor Hans-Jurgen Pettelkau

Hans-Jurgen Pettelkau 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 polymerization of chloroprene
    Patent number: 4163091
    Abstract: The polymerization of chloroprene in the presence of an inorganic peroxy compound, anthraquinone-2-sulphonic acid-alkali salt and formamidine sulphinic acid.
    Type: Grant
    Filed: June 14, 1977
    Date of Patent: July 31, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Jurgen Pettelkau, Gerhard Hohmann
  • Process for the production of a polychloroprene latex which is stable to freezing and thawing
    Patent number: 4155891
    Abstract: Polychloroprene latex which is stable to freezing and thawing can be obtained by adding a betaine of a formula given below before, during or after polymerization.
    Type: Grant
    Filed: January 18, 1977
    Date of Patent: May 22, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Jurgen Pettelkau, Rudolf Hombach, Heinz Esser, Wilfried Keller
  • Process for the production of polychloroprene
    Patent number: 4125697
    Abstract: Object of the invention is a process for polymerizing chloroprene in aqueous emulsion in a certain apparatus which prevents formation of deposits and so-called "popcorn" polymers.
    Type: Grant
    Filed: September 30, 1977
    Date of Patent: November 14, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Jurgen Pettelkau, Bodo Ehrig, Karl Nothen, Dietrich Rosahl
  • Process for the production of concentrated polychloroprene latices
    Patent number: 4104272
    Abstract: Objects of the invention are an emulsifier composition suitable for the production of polychloroprene latices as well as a process for polymerizing chloroprene to form a concentrated polymer latex.
    Type: Grant
    Filed: May 3, 1976
    Date of Patent: August 1, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventor: Hans-Jurgen Pettelkau