Patents by Inventor Royston Thomas

Royston Thomas 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).

  • Phenolic antioxidant
    Patent number: 4467119
    Abstract: A process of purifying tris(1-hydroxy-3-methyl-6-tert. butyl phenyl) butane comprises crystallizing it from an aromatic hydrocarbon having 6 to 9 carbon atoms to produce a product containing said hydrocarbon and removing at least part of the hydrocarbon from the product by washing it with a liquid consisting essentially of at least one water miscible alcohol and water.
    Type: Grant
    Filed: May 4, 1983
    Date of Patent: August 21, 1984
    Assignee: ICI Americas Inc.
    Inventor: Royston Thomas