Patents Represented by Attorney F. D. Shearin

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  • Color stabilization of refined dicarboxylic acid anhydrides
    Patent number: 3975408
    Abstract: Refined dicarboxylic acid anhydrides such as maleic anhydride are provided with improved color stability by a treating agent selected from the group consisting of chlorine and halides or elements in group IVb of the periodic table, the transition elements, vanadium, chromium, manganese, mercury, silicon, phosphorus, bismuth, antimony, lead, cerium and sulfur.
    Type: Grant
    Filed: October 31, 1972
    Date of Patent: August 17, 1976
    Assignee: Monsanto Company
    Inventors: Ronald J. Boyer, Raymond E. Stenseth, Richard J. Sheehan
  • Process for the nitration of haloaromatics
    Patent number: 3957890
    Abstract: It was found that the process for the nitration of halogenated aromatic compounds is improved by carrying out the nitration in the presence of a phosphorus compound in an amount sufficient to produce an ortho-directive effect. The addition of polyvalent metal elements such as vanadium, molybdenum, tungsten, and other elements that have the capability of existing in a variety of oxidation states, to a mixture of phosphoric and nitric acid improves the yield of the nitrohaloaromatics without affecting the isomer ratio.
    Type: Grant
    Filed: August 20, 1973
    Date of Patent: May 18, 1976
    Assignee: Monsanto Company
    Inventor: Ignatius Schumacher