Patents by Inventor Günther Cramm

Günther Cramm 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 4,6-dichloropyrimidine
    Patent number: 6822095
    Abstract: The present invention relates to a process for preparing 4,6-dichloropyrimidine by reaction of 4-chloro-6-hydroxypyrimidine with an acid chloride.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: November 23, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Franz-Josef Mais, Günther Cramm, Alexander Klausener, Guido Steffan
  • Method for producing 4-chloro-6-hydroxypyrimidine
    Patent number: 6562970
    Abstract: The present invention relates to a process for preparing 4-chloro-6-hydroxypyrimidine from 4-chloro-6-methoxypyrimidine.
    Type: Grant
    Filed: December 20, 2001
    Date of Patent: May 13, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Franz-Josef Mais, Günther Cramm, Alexander Klausener, Guido Steffan
  • Method for producing 4,6-dichloropyrimidine with sulfur compounds and phosphorus compounds
    Patent number: 6525198
    Abstract: The invention relates to a method for the preparation of 4,6-dichloropyrimidine by reacting 4-chloro-6-methoxypyrimidine with at least one sulphur-containing chlorinating agent selected from the group consisting of SCl2, SOCl2, and SO2Cl2 in the presence of at least one phosphorus compound having the formula R3P═Yn  (1), in which R represents C1-C10-alkyl or C6-C10-aryl, each of which may optionally be substituted by up to five identical or different substituents selected from the group consisting of fluorine, chlorine, bromine, C1-C4-alkyl, and C1-C4-alkoxy, Y represents oxygen or sulphur, and n represents zero or 1.
    Type: Grant
    Filed: February 7, 2002
    Date of Patent: February 25, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Franz-Josef Mais, Alexander Klausener, Günther Cramm, Guido Steffan
  • Method of producing 4,6-dichloropyrimidine with acid chlorides
    Patent number: 6441170
    Abstract: The present invention relates to a process for preparing 4,6-dichloro-pyrimidine by reaction of 4-chloro-6-methoxypyrimidine with an acid chloride in the presence of a hydrogen halide.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: August 27, 2002
    Assignee: Bayer Akitnegesellschaft
    Inventors: Franz-Josef Mais, Günther Cramm, Alexander Klausener, Guido Steffan
  • Method for the production of 4,6-dichloropyrimidine with the aid of phosgene
    Patent number: 6441171
    Abstract: The invention relates to a method for the preparation of 4,6-dichloropyrimidine by reacting 4-chloro-6-methoxypyrimidine with phosgene as chlorinating agent in the presence of a nitrogen-containing auxiliary.
    Type: Grant
    Filed: January 24, 2002
    Date of Patent: August 27, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Franz-Josef Mais, Günther Cramm, Alexander Klausener, Guido Steffan