Patents by Inventor Thomas H. Overgaard

Thomas H. Overgaard 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 alkanesulfonamides with low residual ammonium impurities
    Patent number: 5599983
    Abstract: A method is disclosed for the preparation of alkanesulfonamide containing low amounts of ammonium or alkylammonium-salt impurities wherein alkanesulfonamide is treated with a base to convert ammonium or alkylammonium-salt impurities to their corresponding base salts and to liberate neutral amine or ammonia.
    Type: Grant
    Filed: August 21, 1995
    Date of Patent: February 4, 1997
    Inventors: Gary S. Smith, Robert Cordova, Thomas H. Overgaard, Marc T. Budrick
  • Process for preparing color-stable tertiary butyldiethanolamine
    Patent number: 5424482
    Abstract: Tertiary-butyldiethanolamine subject to color deterioration is purified and stabilized against color formation by vacuum distilling said amine at a pressure within the range of 1 to 50 mm.
    Type: Grant
    Filed: August 8, 1991
    Date of Patent: June 13, 1995
    Assignee: Elf Atochem N.A., Inc.
    Inventors: Thomas H. Overgaard, Louis P. Verduce
  • Purification and decolorization of off-color alkyl alkanolamines
    Patent number: 5208377
    Abstract: Off-color N-(C.sub.4 -C.sub.10)alkyl di(C.sub.2 -C.sub.3) alkanolamines purified and decolorized by vacuum distillation at a pressure within the range of 1 to 50 mm.Hg (1-50 torr) in the presence of water and or water-soluble metal borohydride whereby the distilled alkanolamine has a reduced APHA color rating which is maintained on storage.
    Type: Grant
    Filed: September 1, 1992
    Date of Patent: May 4, 1993
    Assignee: Elf Atochem North America, Inc.
    Inventors: Thomas H. Overgaard, Louis P. Verduce
  • Process of forming a stable colloidal dispersion
    Patent number: 5051205
    Abstract: A method is disclosed to prepare a uniform, stable dispersion of an additive amount of a water-insoluble, high viscosity liquid polyalkylene glycol derivative in a substantially nonaqueous, water-soluble alkanolamine by combining under pressure a proportionate amount of the total polyglycol derivative to be added to the alkanolamine component, or mixture of alkanolamine and polyglycol derivative, subjecting the mixture to shear stress, and repeating the procedure until a uniform colloidal dispersion is obtained of the alkanolamine containing the desired additive amount of polyglycol derivative.
    Type: Grant
    Filed: April 18, 1990
    Date of Patent: September 24, 1991
    Assignee: Atochem North America, Inc.
    Inventors: Thomas H. Overgaard, Gregory J. Cutting