Patents by Inventor Mark L. Garibaldi

Mark L. Garibaldi 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).

  • Control of isomer distribution in a chlorination process
    Patent number: 4939263
    Abstract: The relative amounts of 5,6-dichloro-2-(trichloromethyl)pyridine and 3,6-dichloro-2-(trichloromethyl)pyridine obtained in the chlorination of 2-chloro-6-(trichloromethyl)pyridine in the liquid phase at temperatures of about 160.degree. C. to about 220.degree. C. and in the presence of a metal halide catalyst, such as ferric chloride, are controlled by regulating the amount of hydrogen chloride present in the system, adding hydrogen chloride to obtain a mixture enriched in 5,6-dichloro-2-(trichloromethyl)pyridine or removing hydrogen chloride, usually by passing excess chlorine or an inert gas through the system, to obtain a mixture enriched in 3,6-dichloro-2-(trichloromethyl)pyridine.
    Type: Grant
    Filed: September 28, 1989
    Date of Patent: July 3, 1990
    Assignee: The Dow Chemical Company
    Inventors: Richard K. Helling, Philip D. Grover, Thomas J. Dietsche, Mark L. Garibaldi