Patents by Inventor Joe J. Hanson

Joe J. Hanson 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 of preparing 1-acetyl-1-chlorocyclopropane
    Patent number: 7227042
    Abstract: The present invention provides a method of preparing 1-acetyl-1-chlorocyclopropane from 1,3 dichloro-2-pentanone by reaction with base in the presence of a phase transfer catalyst. The reaction may be run in the presence or absence of an organic solvent and in a continuous or batch process.
    Type: Grant
    Filed: April 6, 2004
    Date of Patent: June 5, 2007
    Assignees: Bayer CropScience LP, Bayer CropScience Aktiengesellschaft
    Inventors: Joe J. Hanson, David M. Mayes, Klaus Stroech, Shekhar V. Kulkarni
  • Process for the preparation of 1-(4-chlorophenyl)-4,4-dimethylpent-1-ene-3-one
    Patent number: 7119234
    Abstract: The present invention relates to a method for the preparation of as 1-(4-Chlorophenyl)-4,4-dimethylpent-1-ene-3-one, also known as Phenyl aldol. The process of the present invention utilizes catalysts. The process enables the manufacture of the Phenyl aldol in the absence of a solvent and without crystalization or filtration steps. Yields in the range of about greater than 95% with purities in the range of about greater than 95% have been obtained with the present invention.
    Type: Grant
    Filed: November 19, 2004
    Date of Patent: October 10, 2006
    Assignee: Bayer Cropscience LP
    Inventors: Shekhar V. Kulkarni, Joe J. Hanson
  • Methods of purifying 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole
    Publication number: 20020156286
    Abstract: Methods of purifying 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole include the steps of providing a first 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole composition comprising 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole and organic solvent; performing a first extraction of the 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole composition with a first inorganic acid solution; and performing a second extraction of the 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole composition with a second inorganic acid solution.
    Type: Application
    Filed: February 20, 2001
    Publication date: October 24, 2002
    Inventors: Dennis E. Jackman, Joe J. Hanson
  • Methods of purifying 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole
    Patent number: 6469175
    Abstract: Methods of purifying 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole include the steps of providing a first 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole composition comprising 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole and organic solvent; performing a first extraction of the 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole composition with a first inorganic acid solution; and performing a second extraction of the 2-methylthio-5-trifluoromethyl-1,3,4-thiadiazole composition with a second inorganic acid solution.
    Type: Grant
    Filed: February 20, 2001
    Date of Patent: October 22, 2002
    Assignee: Bayer Corporation
    Inventors: Dennis E. Jackman, Joe J. Hanson
  • Process for the preparation of 2-(methylsulfonyl)-5-(trifluoromethyl)-1,3,4-thiadiazole (TDA sulfone)
    Patent number: 6031108
    Abstract: The present invention provides a process for making thiadiazole sulfones. In particular, the present process is used to make 2-(methylsulfonyl)-5-(trifluoromethyl)-1,3,4-thiadiazole using catalytic oxidation in the presence of a suitable oxidizing agent. The catalyst system used for the oxidation reaction is a mixture of glacial acetic acid and a tungsten catalyst. The tungsten catalyst is preferably selected from the group consisting of sodium tungstate, potassium tunstate, and tungstic acid.
    Type: Grant
    Filed: September 16, 1998
    Date of Patent: February 29, 2000
    Assignee: Bayer Corporation
    Inventors: Vidyanatha A. Prasad, Klaus Jelich, Joe J. Hanson
  • Approach to the conversion of 2-(methylthio)-5-(trifluoromethyl)-1,3,4-thiadiazole (TDA) to 2-(methylsulfonyl)-5-(trifluoromethyl)-1,3,4-thiadiazole (TDA sulfone)
    Patent number: 5965737
    Abstract: The present invention provides a process for making thiadiazole sulfones. In particular, the present process is used to make 2-(methyl-sulfonyl)-5-(trifluoromethyl)-1,3,4-thiadiazole using catalytic oxidation in the presence of a suitable oxidizing agent. A preferred oxidizing agent is hydrogen peroxide. The catalyst system used for the oxidation reaction is a mixture of boric acid and glacial acetic acid. The molar ratio of glacial acetic acid to 2-(methylthio)-5-(trifluoromethyl)-1,3,4-thiadiazole is from about 0.1:1 to about 0.5:1.
    Type: Grant
    Filed: February 17, 1999
    Date of Patent: October 12, 1999
    Assignee: Bayer Corporation
    Inventors: Vidyanatha A. Prasad, Joe J. Hanson, Klaus Jelich