Patents by Inventor Marion J. Mathews, III

Marion J. Mathews, III 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).

  • Acrylonitrile dimerization process and method of treating residual catalyst
    Patent number: 4952541
    Abstract: Treatment of dicyanobutene to inactivate residual dimerization catalyst facilitates hydrogenation of the product to form adiponitrile.
    Type: Grant
    Filed: September 1, 1989
    Date of Patent: August 28, 1990
    Assignee: Monsanto Company
    Inventors: William A. Heckle, Marion J. Mathews, III, P. Robert Peoples
  • Acrylonitrile dimerization process
    Patent number: 4841087
    Abstract: Acrylonitrile dimerization is improved by increasing the proportions of catalyst used in the reaction mixture.
    Type: Grant
    Filed: March 14, 1988
    Date of Patent: June 20, 1989
    Assignee: Monsanto Company
    Inventors: Marion J. Mathews III, P. Robert Peoples
  • Dimerization process improvements
    Patent number: 4639539
    Abstract: Acrylonitrile is catalytically dimerized in the presence of an organic phosphorus (III) catalyst, an inert hydrocarbon reaction solvent and a non-interfering proton-donating solvent; and the dimerized product separated from the catalyst by extraction. In the extraction the dimerized product is preferably dissolved in an extraction solvent and removed from the catalyst phase preparation. In the instant invention, the extraction solvent is an amide, preferably formamide. The extraction solvent and proton-donating solvent may be identical.
    Type: Grant
    Filed: December 3, 1985
    Date of Patent: January 27, 1987
    Assignee: Monsanto Company
    Inventors: Leonard L. Hovey, Marion J. Mathews, III, P. Robert Peoples
  • Production and separation of amines
    Patent number: 4491673
    Abstract: This invention provides for the separation of the contents of the process discharge stream of reaction in which an amine is produced from a nitrile. An inorganic base having a concentration greater than 40 weight percent is introduced into the process discharge stream which is decanted, purged, flashed, and a portion thereof recycled.
    Type: Grant
    Filed: April 19, 1982
    Date of Patent: January 1, 1985
    Assignee: Monsanto Company
    Inventors: Charles E. Cutchens, Marion J. Mathews, III, Mark S. Sowell, III
  • Production and separation of amines
    Patent number: 4395573
    Abstract: In the production of hexamethylenediamine from adiponitrile an inorganic base is used to facilitate separation of Raney nickel catalyst and crude hexamethylenediamine.
    Type: Grant
    Filed: November 23, 1981
    Date of Patent: July 26, 1983
    Assignee: Monsanto Company
    Inventors: Charles E. Cutchens, Marion J. Mathews, III, Mark S. Sowell, III
  • Electroplating cathodes for electrochemical synthesis
    Patent number: 4203808
    Abstract: Packages of undivided electrolytic cells for electrochemical synthesis having a plurality of metal-plated cathodes with corresponding anodes are produced by assembling and permanently fixing the electrodes in substantially parallel-planar relationship as a package and thereafter electroplating the cathodes in package form by applying an electric potential between the anodes and cathodes in an electroplating solution containing the plating metal in complex form, the anodes functioning as non-sacrificial anodes during electroplating. Such electroplating may be accomplished in the electrochemical synthesis cells and may employ the same power application means and controls as the means and controls employed in the electrochemical synthesis.
    Type: Grant
    Filed: July 14, 1976
    Date of Patent: May 20, 1980
    Assignee: Monsanto Company
    Inventors: Charles R. Campbell, William A. Heckle, Marion J. Mathews, III