Patents by Inventor Ian G. Dobson

Ian G. Dobson 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 production of nuclei for use in titanium dioxide manufacture
    Patent number: 5147629
    Abstract: A process for the production of a suspension of nuclei has been developed in which an aqueous mixture of titanium tetrachloride, aluminium ions and hydroxyl ions is cured at at temperature of from 50.degree. to the boiling point. The pH of the suspension before or after curing has a value of from 6.5 to 10.5. The aqueous mixture is prepared by mixing a solution of titanium tetrachloride with a solution of a base, e.g. sodium hydroxide and aluminium hydroxide.When used to nucleate hydrolysis in the "sulphate" process a large crystal size anatase pigment is produced.
    Type: Grant
    Filed: August 12, 1991
    Date of Patent: September 15, 1992
    Assignee: Tioxide Group Services Limited
    Inventors: John Robb, Ian G. Dobson