Patents by Inventor Gonzague Overney

Gonzague Overney 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 alkyl esters of tetrachloro-2-cyano-benzoic acid
    Patent number: 4978768
    Abstract: Tetrachloro-2-cyanobenzoic acid alkyl esters of formula ##STR1## wherein R is C.sub.1 -C.sub.5 alkyl, can be very conveniently prepared by (a) reacting the ammonium salt of tetrachloro-2-cyanobenzoic acid, in the presence of water and an inert organic solvent, with a hydroxide of formula MOH, wherein M is Na or K, and removing the ammonia evolved, and(b) reacting the resultant salt of the formula ##STR2## wherein M is as defined above, with at least 1 mole of a dialkyl sulfate of formula SO.sub.2 (OR).sub.2 or an alkyl halide of formula RHal, wherein R is as defined above and Hal is Cl, Br, I or F, also in the presence of water and an inert organic solvent.
    Type: Grant
    Filed: January 8, 1987
    Date of Patent: December 18, 1990
    Assignee: Ciba-Geigy Corporation
    Inventors: Jost von der Crone, Gonzague Overney, Peter Dario