Patents by Inventor Bjoern Girgensohn

Bjoern Girgensohn 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).

  • Preparation of monoclinic metazachlor
    Patent number: 5416219
    Abstract: Monoclinic 2-chloro-(2',6'-dimethyl-N-pyrazol-1-ylmethyl)-acetanilide of the formula ##STR1## which melts at 76.degree. C. Processes for its preparation and herbicides.
    Type: Grant
    Filed: January 11, 1994
    Date of Patent: May 16, 1995
    Assignee: BASF Aktiengesellschaft
    Inventors: Michael Keil, Bjoern Girgensohn, Gotthard Synnatschke, August Wigger, Hans Ziegler, Walter Gueckel
  • Preparation of monoclinic metazachlor
    Patent number: 5300652
    Abstract: Monoclinic 2-chloro-(2',6'-dimethyl-N-pyrazol-1-ylmethyl)-acetanilide of the formula I ##STR1## which melts at 76.degree. C.
    Type: Grant
    Filed: April 19, 1993
    Date of Patent: April 5, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Michael Keil, Bjoern Girgensohn, Gotthard Synnatschke, August Wigger, Hans Ziegler, Walter Gueckel
  • Monoclinic metazachlor and composition
    Patent number: 5250503
    Abstract: Monoclinic 2-chloro-(2',6'-dimethyl-N-pyrazol-1-ylmethyl)-actanilide of the formula ##STR1## which melts at 76.degree. C. Processes for its preparation and herbicides.
    Type: Grant
    Filed: July 24, 1992
    Date of Patent: October 5, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Michael Keil, Bjoern Girgensohn, Gotthard Synnatschke, August Wigger, Hans Ziegler, Walter Gueckel
  • Preparation of cis-2,6-dimethylmorpholine
    Patent number: 4504363
    Abstract: 2,6-Dimethylmorpholine containing a high proportion of the cis compound is prepared by cyclization of diisopropanolamine (1,1'-iminobispropan-2-ol) in the presence of sulfuric acid, with simultaneous addition of the components and full utilization of the heat of reaction.
    Type: Grant
    Filed: May 5, 1983
    Date of Patent: March 12, 1985
    Assignee: BASF Aktiengesellschaft
    Inventors: Norbert Goetz, Bjoern Girgensohn, Fritz Zanker
  • Preparation of aromatic azomethines
    Patent number: 4491672
    Abstract: Aromatic azomethines are prepared by reacting anilines with formaldehyde and then removing the greater part of the water by distillation, low-boiling alcohols, in certain amounts, being present during the distillation and, if desired, during the reaction or during a part thereof.The aromatic azomethines obtainable by the novel process are valuable starting materials for the preparation of herbicides, especially pre-emergence herbicides and post-emergence herbicides, fungicides, insecticides, bacteriostatic agents, fungistatic agents and vulcanization accelerators.
    Type: Grant
    Filed: June 2, 1980
    Date of Patent: January 1, 1985
    Assignee: BASF Aktiengesellschaft
    Inventors: Winfried Richarz, Dietrich Mangold, Bjoern Girgensohn
  • Preparation of O,N-disubstituted hydroxylamines
    Patent number: 4260562
    Abstract: O,N-Disubstituted hydroxylamines are prepared by reacting O-substituted ketoximes with hydrogen in the presence of a platinum catalyst at from 35 to 50 bar, in a medium containing a mineral acid.The O,N-disubstituted hydroxylamines I obtained by the process of the invention are valuable starting materials for the preparation of dyes, crop protection agents and drugs.
    Type: Grant
    Filed: February 27, 1980
    Date of Patent: April 7, 1981
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Linhart, Bjoern Girgensohn, Gernot Reissenweber, Eckhard Hickmann
  • N-Cyclohexyl-N-methoxyacetoacetamide
    Patent number: 4240973
    Abstract: N-Cyclohexyl-N-methoxyacetoacetamide, its preparation and its use as an intermediate for the preparation of O-methyl-N-cyclohexyl-2,5-dimethylfuran-3-hydroxamic acid.
    Type: Grant
    Filed: July 23, 1979
    Date of Patent: December 23, 1980
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Linhart, Bjoern Girgensohn, Bernd Zeeh
  • Preparation of 2,5-dimethylfuran-3-carboxylic acid alkyl esters
    Patent number: 4207243
    Abstract: A process for the preparation of a 2,5-dimethylfuran-3-carboxylic acid ester from an .alpha.-acyloxypropionaldehyde and an acetoacetic acid ester in the presence of anhydrous iron-III chloride.
    Type: Grant
    Filed: May 22, 1979
    Date of Patent: June 10, 1980
    Assignee: BASF Aktiengesellschaft
    Inventors: Friedrich Linhart, Bjoern Girgensohn, Hans Merkle, Hardo Siegel, Hans-Richard Mueller