Patents by Inventor John M. Thorman

John M. Thorman 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).

  • Purification of alkyl glyoxylate
    Patent number: 4867849
    Abstract: There is disclosed an improved process for the manufacture of glyoxylic acid obtained by oxidation of glycolic acid. For processing purposes alkyl esters of these acids are employed. Increased efficiency is obtained by recovering glycolate rich streams from one or more distillation operations and after treatment to remove acetic acid by-product the streams are recycled to the oxidation reaction.
    Type: Grant
    Filed: July 25, 1988
    Date of Patent: September 19, 1989
    Inventors: Dario R. Cova, John M. Thorman
  • Purification of alkyl glyoxylate in a continuous column by azeotropic distillation
    Patent number: 4820385
    Abstract: An improved process for separating high purity alkyl glyoxylate from complex mixtures containing alkyl glyoxylate, alkyl glycolate, water, alcohol and miscellaneous impurities by an azeotropic distillation operation using an azeotroping agent selected from the group consisting of methylene dichloride, 1,1,1--trichloroethane, and benzene.
    Type: Grant
    Filed: February 18, 1988
    Date of Patent: April 11, 1989
    Assignee: Monsanto Company
    Inventors: Dario R. Cova, John M. Thorman