Patents by Inventor Jean Ernest Etienne Leboulenger

Jean Ernest Etienne Leboulenger 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).

  • Process for the preparation of 4'-alkoxy-4-naphthalimido-pyrazolium compounds and intermediates therefor
    Patent number: 3932413
    Abstract: A process for the preparation of an optical brightening agent falling within the formula: ##SPC1##In which R represents an alkyl group containing 1 to 4 carbon atoms, R.sub.1 and R.sub.2 each represent a hydrogen atom, an alkyl group containing 1 to 4 carbon atoms or a phenyl group either unsubstituted or substituted by at least one alkyl group containing 1 to 4 carbon atoms, R.sub.3 and R.sub.4 each represent an alkyl group containing 1 to 4 carbon atoms and A.sup.- represents a monovalent anion which comprises reacting a compound of the formula: ##SPC2##In which R.sub.1, R.sub.2, R.sub.3, R.sub.4, and A.sup.- have the meanings given above, with an alcoholate of the formula RO-Me in which R represents an alkyl group containing 1 to 4 carbon atoms and Me is an alkali metal; compounds falling within the formula: ##SPC3##Wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and A.sup.- have the meanings given above.
    Type: Grant
    Filed: May 21, 1973
    Date of Patent: January 13, 1976
    Assignee: Products Chimiques Ugine Kuhlmann
    Inventors: Annick Marthe Suzanne Simone Domergue, Robert Frederic Michel Sureau, Jean Ernest Etienne Leboulenger, Jean Marie Alfred Houssin