Patents by Inventor John K. Darin

John K. Darin 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).

  • Oxidation of pseudocumene to trimellitic acid enhanced by low gram atom ratios of zirconium to transition metal in oxidation catalyst system
    Patent number: 4895978
    Abstract: Excess burning of pseudocumene, lowering concentration of use of cobalt and replace it with manganese by the use of less than the previously used 3.0 to 0.1 milligram atom of zirconium, preferable from 0.005 up to 0.075 milligram atom of zirconium, per 1.0 milligram atom of total of transition metals cobalt and manganese or cobalt, manganese and cerium.
    Type: Grant
    Filed: May 19, 1986
    Date of Patent: January 23, 1990
    Assignee: Amoco Corporation
    Inventors: John K. Darin, Alan G. Bemis
  • Minimizing oxygenated aromatic compound content of aqueous solution of reclaimed metal oxidation catalyst
    Patent number: 4284523
    Abstract: This invention relates to the reclamation of metal oxidation catalysts by water extraction of a high boiling residual mixture remaining after separation of a benzene di- and/or tricarboxylic acid; e.g., the phthalic acids, trimesic acid or trimellitic acid and reaction solvent, if one is used, from the fluid oxidation effluents produced by the catalytic liquid phase oxidation of a xylene, mesitylene, psendocumene or o-xylene and psendocumene with a source of molecular oxygen in the presence or in the absence of a reaction solvent.
    Type: Grant
    Filed: May 22, 1980
    Date of Patent: August 18, 1981
    Assignee: Standard Oil Company (Indiana)
    Inventors: John K. Darin, Walter Partenheimer, Joseph D. Figuly