Patents Represented by Attorney Benjamin Mielilis

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  • Mono(indolylethylenyl)phthalides
    Patent number: 5200519
    Abstract: Preparation of novel mono(indolylethylenyl) phthalides is disclosed. Specifically, these compounds are chromogenic mono(indolylethylenyl)phthalides of the formula ##STR1## wherein A is as hereinafter defined and selected from moieties of the type ##STR2## wherein L is an indole moiety as hereinafter defined; wherein B is a moiety of the type ##STR3## as hereinafter defined. The process disclosed comprises condensing indolylethylene with a keto acid or its derivative and an electron acceptor in an organic solvent.
    Type: Grant
    Filed: January 3, 1992
    Date of Patent: April 6, 1993
    Assignee: Appleton Papers Inc.
    Inventor: Ponnampalam Mathiaparanam