Patents by Inventor Daniel R. Chisolm

Daniel R. Chisolm 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).

  • S-alkylthiopropionic acids and derivatives
    Patent number: 5198486
    Abstract: 3-alkylthiopropionic acids are provided which are a direct addition reaction product of an alkylmercaptan and acrylic acid or an alkali metal salt thereof, the reaction being carried out by heating the reactants in the presence of an aqueous alkaline solution having a pH of at least about 11. The acids can be esterified with pentaerythritol in order to form tetraesters which are especially useful as stabilizers for polymer resins and polymers.
    Type: Grant
    Filed: October 1, 1991
    Date of Patent: March 30, 1993
    Assignee: Witco Corporation
    Inventors: Daniel R. Chisolm, Michael H. Fisch, Mark E. Flanagan, Richard D. Peveler
  • Process for the preparation of aromatic beta-diketones
    Patent number: 5015777
    Abstract: A process for the preparation of aromatic beta-diketones by the reaction of an acetophenone and a molar excess of an alphatic ester or an ester of benzoic acid in the presence of sodium alkoxide condensation agent in an aromatic hydrocarbon solvent. Also disclosed is a method of recycling the solvent and excess ester reactant after separation of the aromatic beta-diketone product.
    Type: Grant
    Filed: November 2, 1989
    Date of Patent: May 14, 1991
    Assignee: Witco Corporation
    Inventors: Daniel R. Chisolm, Richard A. Weiss, Leonid Rozov