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:
Jul. 23, 1985
Filed:
Jun. 28, 1984
Werner Ostertag, Gruenstadt, DE;
Peter Dimroth, Mannheim, DE;
Henning Wienand, Neulussheim, DE;
Egon Liedek, Esslingen, DE;
Helmut Knittel, Ludwigsburg, DE;
Gunter Etzrodt, Stuttgart, DE;
BASF Farben, Hamburg, DE;
Fasern Aktiengesellschaft, Hamburg, DE;
Abstract
Thermally stable lead chromate pigments or pigments containing lead chromate, which have high color strength and are provided with a precipitated coating containing silicon dioxide, are prepared by a process in which an aqueous pigment suspension is mixed once or several times with an aqueous MgSiF.sub.6 solution, the pH being maintained at 4.5-9.5 and the temperature at 50.degree.-95.degree. C., and the pigment is then separated off and worked up, these steps being carried out in a conventional manner.