Patents Represented by Attorney B. Woodron Wyatt

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  • Carbonless duplicating and marking systems utilizing indolyl-substituted furanone color formers
    Patent number: 4275121
    Abstract: Mono-, bis- and tris-indolyl-substituted furanones useful as color formers, particularly in carbonless duplicating and thermal marking systems, which are prepared respectively by: the interaction of an indole with mucochloric acid; the interaction of an indole with a 4-mono(indolyl)-substituted 4-oxo-2-butenoic acid; and by the interaction of an indole with a 2,4-bis(indolyl)-substituted 4-oxobutanoic acid or with a 3,5-bis(indolyl)-substituted furanone.
    Type: Grant
    Filed: July 19, 1979
    Date of Patent: June 23, 1981
    Assignee: Sterling Drug Inc.
    Inventors: Nathan N. Crounse, Paul J. Schmidt