Patents by Inventor Kian F. Ngian

Kian F. Ngian 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 the purification of zirconium compounds
    Patent number: 4822575
    Abstract: The invention concerns processes for the preparation of zirconium compositions which on calcination form zirconia. The zirconium compositions are prepared by the addition of an ammonia source to an aqueous zirconium sulfate solution to give a solution pH in the range of from 0.1 to 2.5 and preferably 1.0 to 2.0. The zirconium composition precipitated from solution appears crystalline, is readily collected by filtration and has low levels of metallic impurities. Therefore, the process of the invention may be used to advantage in the purification zirconium compounds.The invention also includes the zirconium compositions and processes for the purification of zirconium compounds including zirconia.
    Type: Grant
    Filed: January 2, 1987
    Date of Patent: April 18, 1989
    Assignee: ICI Australia Limited
    Inventors: Kian F. Ngian, Angus J. Hartshorn, David H. Jenkins