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:
Oct. 26, 1993
Filed:
Jul. 24, 1992
Applicant:
Inventor:
Robert W Pfitzenmaier, Canisteo, NY (US);
Assignee:
Corning Incorporated, Corning, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03L / ;
U.S. Cl.
CPC ...
501-4 ; 501 69 ; 501 71 ;
Abstract
A method of varying the color in a glass-ceramic material having a beta-quartz solid solution as the predominant crystal phase which comprises controlling the Al.sub.2 O.sub.3 level between 19 and 20% by weight, the Fe.sub.2 O.sub.3 level between 700 and 900 ppm and the Co.sub.3 O.sub.4 level between not over 15 ppm and 140 ppm. An amber color is obtained with 20-40 ppm Co.sub.3 O.sub.4 and a burgundy color with 120-140 ppm Co.sub.3 O.sub.4. Co.sub.3 O.sub.4 in a compatible carrier may be added to molten glass as a forehearth additive.