Patents by Inventor Dario R. Cova

Dario R. Cova 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 preparing carboxylic amide ester
    Patent number: 5235093
    Abstract: A process for preparing precursors for amido containing organic peracids is disclosed wherein a diester of a dibasic acid is reacted with an amine to provide a mono amido carboxylic acid ester. The reaction is conducted in a reaction column to provide a highly selective reaction which limits the amount of diamide produced. The selective reaction is conducted with a moderate excess of diester and may be conveniently operated on a continuous basis.
    Type: Grant
    Filed: January 27, 1992
    Date of Patent: August 10, 1993
    Assignee: Monsanto Company
    Inventors: Dario R. Cova, Don B. Edwards
  • Process for preparing fatty peroxyacid precursors having amide moieties in the fatty chain
    Patent number: 5166407
    Abstract: A process for preparing precursors for amido containing organic peracids is disclosed wherein a diester of a dibasic acid is reacted with an amine to provide a mono amido ester carboxylic acid ester. The reaction is conducted in the presence of a catalytic amount of a carboxylic acid whereby the rate of reaction to form the mono amido ester of the dibasic acid is increased. The esters are converted to acids highly desirable as precursers for peracids useful as bleaches in laundry detergents.
    Type: Grant
    Filed: January 27, 1992
    Date of Patent: November 24, 1992
    Assignee: Monsanto Company
    Inventors: Husni R. Alul, Dario R. Cova
  • 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
  • Production of high purity alkyl glyoxylate by plural stage distillation
    Patent number: 4502923
    Abstract: High purity alkyl glyoxylate is produced from complex mixtures containing alkyl glyoxylate, alkyl glycolate, water, alcohol and miscellaneous impurities. High purity alkyl glyoxylate is useful in the synthesis of alkyl glyoxylate polymers.
    Type: Grant
    Filed: October 6, 1983
    Date of Patent: March 5, 1985
    Assignee: Monsanto Company
    Inventors: David R. Dyroff, Yueting Chou, Dario R. Cova
  • Preparation and purification of phosphoryl chloride
    Patent number: 4178353
    Abstract: Residual PCl.sub.3 in POCl.sub.3 which has been prepared by the oxidation of PCl.sub.3 in the presence of air or oxygen-enriched air is converted to POCl.sub.3 by contacting the POCl.sub.3 /PCl.sub.3 mixture with ozone or an ozone-enriched gas.
    Type: Grant
    Filed: August 4, 1975
    Date of Patent: December 11, 1979
    Assignee: Monsanto Company
    Inventors: Joseph W. Baker, Dario R. Cova, James E. White