Patents by Inventor William T. Laverick

William T. Laverick 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).

  • Patent number: 4239548
    Abstract: Commercial titanium dioxide pigments to be used in paper laminates have been prepared by a method which involves calcining a coated pigment. A new pigment having an excellent stability to degradation by light when used in such laminates is produced without calcination of the coated pigment.The pigment comprises rutile titanium dioxide particles having an inner coating containing cerium and phosphate radicals and an outer coating containing aluminium and phosphate radicals and optionally hydrous alumina.The pigment preferably contains a surface stabilizer such as a fluoride, preferably calcium fluoride. Amounts of cerium phosphate are from 0.05% to 1% (as CeO.sub.2) and of aluminium phosphate between 0.05% and 5% by weight (as Al.sub.2 O.sub.3) on TiO.sub.2.
    Type: Grant
    Filed: December 6, 1979
    Date of Patent: December 16, 1980
    Assignee: Tioxide Group Limited
    Inventors: Brian Barnard, William T. Laverick