Patents by Inventor Henri Mathais

Henri Mathais 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).

  • Method for preparing azines
    Patent number: 3943152
    Abstract: A method is disclosed for preparing symmetrical azines of the formulas ##EQU1## and unsymmetrical azines of the formulas ##EQU2## and mixtures of azines (I), (II) and (IV) and (I), (III) and (V) wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each is a hydrogen atom, a straight chain alkyl radical of from 1 to 12 carbon atoms, a branched chain alkyl radical or unsubstituted or alkyl substituted cycloalkyl radical of from 3 to 12 carbon atoms, a hydrocarbon radical of from 6 to 12 carbon atoms containing an aromatic nucleus; further provided that R.sup.1 and R.sup.2 can be the same or different radicals, and R.sup.3 and R.sup.4 are the same or different radicals and each are different from R.sup.1 and R.sup.2 ; or R.sup.1 and R.sup.2 or R.sup.1 and R.sup.3 or R.sup.3 and R.sup.
    Type: Grant
    Filed: March 14, 1973
    Date of Patent: March 9, 1976
    Assignee: Produits Chimiques Ugine Kuhlmann
    Inventors: Pierre Tellier, Jean-Pierre Schirmann, Henri Mathais, Francis Weiss