Patents by Inventor Gerhard Dankert

Gerhard Dankert 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 2,4,5-trichloropyrimidine
    Patent number: 4266059
    Abstract: 2,4,5-Trichloropyrimidine is obtained by reacting 2-cyanoethyl isocyanide dichloride with hydrogen chloride and then reacting the product with chlorine.
    Type: Grant
    Filed: November 30, 1979
    Date of Patent: May 5, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Fritz Doring, Gunther Beck, Gerhard Dankert
  • 2-Cyanoethyl isocyanide dichloride
    Patent number: 4240977
    Abstract: Process for the preparation of tetrachloropyrimidine, characterized in that 2-cyanoethyl isocyanide dichloride is reacted with chlorine in the gas phase in the temperature range from 200.degree.-650.degree. C.
    Type: Grant
    Filed: August 17, 1979
    Date of Patent: December 23, 1980
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gunther Beck, Gerhard Dankert, Fritz Doring
  • Preparation of chlorinated N-methyl-imidazoles and N-methyl-imidazolines
    Patent number: 4216332
    Abstract: In the preparation of chlorinated N-methyl-imidazoles and N-methyl-imidazolines of the formula ##STR1## in which n represents the number 0, 1, 2 or 3 andm represents the number 0 or 1, a double bond being present between the C atoms in the 4-position and 5-position when m is 0, and a single bond being present when m is 1,by chlorinating N,N-dimethylaminoacetonitrile of the formula(CH.sub.3).sub.2 N--CH.sub.2 --CNor its hydrochloride, the improvement which comprises introducing aminoacetonitrile or its hydrochloride into a mixture of its chlorination products, with simultaneous addition of chlorine gas, in the absence of a solvent, at a temperature from about 70.degree. to 150.degree. C. The product can be further chlorinated at 130.degree. to 220.degree. C. to produce tetrachloro-ethylene-bis-isocyanide dichloride.
    Type: Grant
    Filed: December 29, 1978
    Date of Patent: August 5, 1980
    Assignee: Bayer Aktiengesellschaft
    Inventors: Manfred Lenthe, Gerhard Dankert
  • Process for the preparation of tetrachloropyrimidine
    Patent number: 4211869
    Abstract: Process for the preparation of tetrachloropyrimidine, characterized in that 2-cyanoethyl isocyanide dichloride is reacted with chlorine in the gas phase in the temperature range from 200.degree.-650.degree. C.
    Type: Grant
    Filed: November 27, 1978
    Date of Patent: July 8, 1980
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gunther Beck, Gerhard Dankert, Fritz Doring
  • Process for isolating N,N-dimethylaminoacetonitrile from water mixtures
    Patent number: 4176133
    Abstract: In the recovery of N,N-dimethylaminoacetonitrile from a mixture thereof with water by extraction with an organic solvent thereby to form an aqueous phase and an organic solvent phase containing the nitrile, separating the organic phase, and recovering the nitrile from the organic solvent, the improvement which comprises employing 1,2-dichlorobenzene as the organic solvent. Recovery of the nitrile from the organic solvent can be accomplished by distilling of the nitrile, the undistilled solvent being recycled for further use.
    Type: Grant
    Filed: October 19, 1978
    Date of Patent: November 27, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Manfred Lenthe, Gerhard Dankert
  • Process for preparing 1-substituted 2-methyl-tetrahydropyrimidines
    Patent number: 4001232
    Abstract: 1-SUBSTITUTED 2-METHYL-TETRAHYDROPYRIMIDINES ARE PREPARED BY REACTING AN N-substituted propylene diamine with an acetoacetic acid ester or amine at a temperature of from 0.degree. to 80.degree. C and removing the water produced in the reaction at a temperature of from 0.degree. to 80.degree. C.
    Type: Grant
    Filed: July 22, 1975
    Date of Patent: January 4, 1977
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerhard Groegler, Gerhard Dankert, Klaus Recker, Josef Backes