Patents by Inventor Paul de C. de Fillain

Paul de C. de Fillain has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Dihydropyridine derivatives
    Patent number: 4239893
    Abstract: The instant invention relates to compounds of the general formula: ##STR1## wherein R.sub.1 represents an alkyl, alkenyl, phenylalkyl radical, R.sub.2 represents a straight-chain alkyl, a straight- or branched-chain alkenyl or alkynyl radical, a .omega.-halogenoethyl radical, an optionally substituted benzyl radical, or a radical of the formula R.sub.4 --O--(CH.sub.2).sub.n --wherein n is 2, 3 or 4 and R.sub.4 represents a substituted alkyl radical.The compounds of the foregoing formula have been found to be useful as stabilizers for vinyl resins.
    Type: Grant
    Filed: November 20, 1979
    Date of Patent: December 16, 1980
    Assignee: Labaz
    Inventors: Charles Pigerol, Marie-Madeleine Chandavoine, Paul de C. de Fillain