The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 20, 1991
Filed:
Aug. 20, 1990
Applicant:
Inventor:
John R Brand, Oklahoma City, OK (US);
Assignee:
Kerr-McGee Chemical Corporation, Oklahoma City, OK (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09C / ;
U.S. Cl.
CPC ...
106446 ; 106442 ; 106400 ; 106401 ;
Abstract
An improved process is provided for preparing durable titanium dioxide pigments having discrete layers of silica and alumina deposited thereon. The improved process includes careful control of the operating conditions of pH end temperature of a slurry of titanium dioxide pigment during the addition of the coating materials to the slurry and the deposition of the silica and alumina onto the pigment.