Patents Represented by Attorney R. A. Haggard

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  • Process for purifying .alpha.,.beta.-unsaturated esters
    Patent number: 5468899
    Abstract: This invention provides a method for reducing carbonyl-containing impurities in .alpha.,.beta.-unsaturated carboxylic acid esters by treatment of the ester with one or more of a selected phenylenediamine and an acid.
    Type: Grant
    Filed: January 11, 1995
    Date of Patent: November 21, 1995
    Inventors: William Bauer, Jr., Nelson I. Quiros, Rita K. Upmacis