Patents by Inventor Armin Heyn

Armin Heyn 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).

  • Method for producing specific crystalline modifications of polmorphous substances
    Patent number: 7211697
    Abstract: The present invention pertains to a process for the production of a specific crystal modification of a polymorphic, organic substance by precipitation of the specific crystal modification from the aqueous solution of the salt of the polymorphic substances using ordinary water-soluble organic solvents as additives as well as an acid or base.
    Type: Grant
    Filed: May 23, 2003
    Date of Patent: May 1, 2007
    Assignee: Bayer CropScience AG
    Inventors: Axel Eble, Wolfram Sirges, Ulrich Schwiedop, Armin Heyn
  • Process for preparing dimethyl cyanimidocarbonate
    Publication number: 20070088177
    Abstract: The invention relates to a novel process for preparing dimethyl cyanimidocarbonate (DCC, 3,3-dimethoxy-2-azaprop-2-enenitrile) from sodium cyanide, methanol, chlorine gas and cyanamide.
    Type: Application
    Filed: April 30, 2004
    Publication date: April 19, 2007
    Inventors: Holger Weintritt, Michael Bauer, Armin Heyn
  • Method for producing 1,3-disubstituted 2-nitroguanidines
    Patent number: 7026307
    Abstract: The present invention relates to a process for the preparation of compounds of the formula (I) by reacting compounds of the formula (II) in which R1, R2, R4 and Het are as defined in the description, with anhydrous hydrogen halide in the presence of a nitrile.
    Type: Grant
    Filed: April 24, 2002
    Date of Patent: April 11, 2006
    Assignee: Bayer CropScience AG
    Inventors: Jörn Stölting, Kai van Laak, Wolfram Sirges, Armin Heyn, Torsten Taschner
  • Method For Producing Specific Crystalline Modifications Of Polmorphous Substances
    Publication number: 20060036115
    Abstract: The present invention pertains to a process for the production of a specific crystal modification of a polymorphic, organic substance by precipitation of the specific crystal modification from the aqueous solution of the salt of the polymorphic substances using ordinary water-soluble organic solvents as additives as well as an acid or base.
    Type: Application
    Filed: May 23, 2003
    Publication date: February 16, 2006
    Inventors: Axel Eble, Wolfram Sirges, Ulrich Schwiedop, Armin Heyn
  • Method for producing 1,3-disubstituted 2-nitroguanidines
    Publication number: 20040167177
    Abstract: The present invention relates to a process for the preparation of compounds of the formula (I) 1
    Type: Application
    Filed: March 22, 2004
    Publication date: August 26, 2004
    Inventors: Jorn Stolting, Kai Van Laak, Wolfram Sirges, Armin Heyn, Torsten Taschner