Patents by Inventor David J. Weinkauff

David J. Weinkauff 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-carboxyalkyl(aryl)phosphinic acid and corresponding anhydride(s)
    Patent number: 6399814
    Abstract: An improved hydrolysis process comprising a process for the preparation of 2-carboxyalkyl(aryl)phosphinic acid using a controlled addition of water to an acrylation reaction mixture, and control of the temperature. Preparation of 2-carboxyalkyl(aryl)phosphinic acid cyclic anhydride is disclosed using a controlled addition of water, wherein up to about one mole of water per mole of dichloro(aryl)-phosphine charged to the acrylation reaction is added, and temperature is controlled.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: June 4, 2002
    Assignee: Solutia Inc.
    Inventors: David J. Weinkauff, Frank E. Paulik
  • Production of 2-carboxyalkyl (phenyl)phosphinic acid
    Patent number: 6320071
    Abstract: Processes for producing 2-carboxyalkyl(phenyl)phosphinic acid comprising hydrolyzing the reaction mixture produced from the reaction of dichloro(phenyl)phosphine with a carboxylic acid in the presence of water, wherein the hydrolysis is conducted with reduced levels of water.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: November 20, 2001
    Assignee: Solutia Inc.
    Inventors: David J. Weinkauff, Frank E. Paulik
  • Hydroxy ethyl bibenzoate
    Patent number: 5847070
    Abstract: New compounds including bis-.beta.-hydroxy ethyl bibenzoate containing less than 2.5%, and preferably less than 1%, diethylene glycol and a process for the production of the bis-.beta.-hydroxy ethyl bibenzoate by the condensation of 4,4'-biphenyl dicarboxylic acid and ethylene glycol at low temperature and pressure in the presence of a catalyst are disclosed. Use of the compounds to produce polyesters is also disclosed.
    Type: Grant
    Filed: December 1, 1994
    Date of Patent: December 8, 1998
    Assignee: Monsanto Company
    Inventors: Jawed Asrar, David J. Weinkauff, A. Hameed Bhombal
  • Hydroxy ethyl bibenzoate
    Patent number: 5374707
    Abstract: New compounds including bis-.beta.-hydroxy ethyl bibenzoate containing less than 2.5%, and preferably less than 1%, diethylene glycol and a process for the production of the bis-.beta.-hydroxy ethyl bibenzoate by the condensation of 4,4'-biphenyl dicarboxylic acid and ethylene glycol at low temperature and pressure in the presence of a catalyst are disclosed. Use of the compounds to produce polyesters is also disclosed.
    Type: Grant
    Filed: February 18, 1993
    Date of Patent: December 20, 1994
    Assignee: Monsanto Company
    Inventors: Jawed Asrar, David J. Weinkauff, A. Hameed Bhombal
  • Animal feed supplement having reduced corrosion characteristics
    Patent number: 4451486
    Abstract: An improved animal feed supplement having reduced corrosion characteristics is obtained by forming an aqueous solution containing 87-90 percent by weight 2-hydroxy-4-(methylthio)-butanoic acid and partially neutralizing the solution to a pH of 0.9-1.2.
    Type: Grant
    Filed: September 27, 1982
    Date of Patent: May 29, 1984
    Assignee: Monsanto Company
    Inventors: Joseph W. Baker, Dennis L. Mansfield, David J. Weinkauff
  • Animal feed supplement having reduced corrosion characteristics
    Patent number: 4353924
    Abstract: An improved animal feed supplement having reduced corrosion characteristics is obtained by forming an aqueous solution containing 87-90 percent by weight 2-hydroxy-4-(methylthio)-butanoic acid and partially neutralizing the solution to a pH of 0.9-1.2.
    Type: Grant
    Filed: September 4, 1979
    Date of Patent: October 12, 1982
    Assignee: Monsanto Company
    Inventors: Joseph W. Baker, Dennis L. Mansfield, David J. Weinkauff