Patents by Inventor Knut Koob

Knut Koob 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 N-substituted 2-pyrazoline-5-one
    Patent number: 6515139
    Abstract: The present invention relates to a process for preparing N-substituted 2-pyrazolin-5-ones of the formula I where R has the meaning given in claim 1, which comprises reacting a compound of the formula II where R, X and Y have the meanings given in claim 1, at elevated temperature with a molar excess of alkali metal hydroxide in an aqueous reaction medium and then adjusting the pH to pH≦6 by adding an acid.
    Type: Grant
    Filed: May 13, 2002
    Date of Patent: February 4, 2003
    Assignee: BASF Aktiengesellschaft
    Inventors: Hans Rupert Merkle, Erich Fretschner, Knut Koob
  • Process for the manufacture of 5-dichloroacetyl-3,3,6-trimethyl-9-oxo-1,5-diazabicyclo?4.3.0! nonane
    Patent number: 5677452
    Abstract: The manufacture of 5-dichloroacetyl-3,3,6-trimethyl-9-oxo-1,5-diazabicyclo?4.3.0!-nonane I by the reaction of 3,3,6-trimethyl-9-oxo-1,5-diaza-bicyclo?4.3.0!nonane II with dichloroacetyl chloride in the presence of a solvent and a base, whereina) this reaction is carried out in a two-phase system comprising a virtually water-insoluble organic solvent and water, and sodium or potassium hydroxide acting as the base is metered in at a rate corresponding to the rate of consumption of the dichloroacetyl chloride such that the aqueous phase exhibits a pH of from 7 to 9, andb) the resulting product is separated.
    Type: Grant
    Filed: October 24, 1996
    Date of Patent: October 14, 1997
    Assignee: BASF Aktiengesellschaft
    Inventors: Gernot Reissenweber, Winfried Richarz, Knut Koob
  • Process for the purification of 7-chloroquinoline-8-carboxylic acids
    Patent number: 5310915
    Abstract: Purification of 7-chloroquinoline-8-carboxylic acids I ##STR1## (X=H, halogen, lower alkyl group) by recrystallization from lower alcohols which are miscible with water, by carrying the recrystallization in the presence of small amounts of a base.The quinolinecarboxylic acids I are valuable crop protection agents.
    Type: Grant
    Filed: August 3, 1992
    Date of Patent: May 10, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Gernot Reissenweber, Knut Koob, Winfried Richarz
  • Separation of 1-methoxy-2-propanol and water
    Patent number: 5080794
    Abstract: A batchwise or continuous process for separating water from a mixture of water and 1-methoxy-2-propanol by passing a heated mixture in liquid or gaseous form over a hydrophilic membrane which is selective to the passage of water.
    Type: Grant
    Filed: October 19, 1990
    Date of Patent: January 14, 1992
    Assignee: BASF Aktiengesellschaft
    Inventors: Joseph Krug, Gernot Reissenweber, Knut Koob
  • Stabilization of zineb
    Patent number: 4824864
    Abstract: Zineb is stabilized by mixing it with calcium oxide in the absence of sulfur.
    Type: Grant
    Filed: July 11, 1985
    Date of Patent: April 25, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Roman Fischer, Knut Koob, Friedrich Loecher