Patents by Inventor Iain A. Melville

Iain A. Melville 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).

  • Composite pigmentary material
    Patent number: 5338354
    Abstract: A new process for preparing a composite pigment from titanium dioxide and calcium sulphate is provided in which the calcium sulphate is milled to a particle size less than 10 microns, mixed with titanium dioxide and the mixed particulates are coated with an oxide or hydrous oxide of a metal or silicon. The process can particularly be employed in conjunction with a sulphate-process titanium dioxide plant in which by-product sulphuric acid is converted to gypsum. The composite pigment shows improved optical properties in comparison to a mixture of titanium dioxide and gypsum.
    Type: Grant
    Filed: June 23, 1993
    Date of Patent: August 16, 1994
    Assignee: Tioxide Group Services Limited
    Inventors: Iain A. Melville, Robert P. Rauch, deceased