Patents by Inventor Bryan T. Dawson

Bryan T. Dawson 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 of making ketoisophorone via oxidation of isophorone with tert-butyl hydroperoxide
    Patent number: 5545761
    Abstract: A method of manufacturing 2,6,6-trimethyl-2-cyclohexen-1,4-dione (ketoisophorone) from 3,5,5-trimethyl-2-cyclohexenone (alpha-isophorone). The alpha-isophorone is reacted with hydroperoxide in a solvent, and in the presence of a metal catalyst. The reaction converts the alpha-isophorone directly to ketoisophorone without the intermediate isomerization of alpha-isophorone to beta-isophorone (3,5,5-trimethyl-3-cyclohexenone).
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: August 13, 1996
    Assignee: Aristech Chemical Corporation
    Inventors: Bryan T. Dawson, Joseph Pugach