Patents Represented by Attorney Charles M. Vanecek

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  • Oxindole diamines
    Patent number: 4016173
    Abstract: Oxindole diamines are prepared by a process comprising reacting an isatin derivative with an anilide and a Friedel Crafts catalyst in an inert solvent at a temperature of from 50.degree. to 150.degree. C with subsequent hydrolysis of the reaction product to yield the oxindole diamine. These compounds are useful in preparing polyimide type polymers.
    Type: Grant
    Filed: September 26, 1975
    Date of Patent: April 5, 1977
    Assignee: Ciba-Geigy Corporation
    Inventors: Franklin P. Darmory, Marianne DiBenedetto