Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Reexamination Certificate
2011-07-19
2011-07-19
Lorengo, Jerry (Department: 1731)
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
C501S004000, C501S064000, C501S068000, C428S428000, C428S432000
Reexamination Certificate
active
07981823
ABSTRACT:
A transparent, colorless lithium-aluminosilicate glass ceramic plate with high-quartz mixed crystals as the prevailing crystal phase, which is provided on one side with an opaque, colored, temperature-stable coating over the entire surface or over the entire surface to a large extent, is described, which has a content of Nd2O3of 40 to 4000 ppm, a Yellowness Index of less than 10% with a 4 mm glass (ceramic) layer thickness, and a variegation of colors of the glass or the glass ceramic in the CIELAB color system of C* of less than 5. The glass ceramic plate preferably has a composition (in % by weight based on oxide) of: Li2O 3.0-4.5, Na2O 0-1.5, K2O 0-1.5, ΣNa2O+K2O 0.2-2.0, MgO 0-2.0, CaO 0-1.5, SrO 0-1.5, BaO 0-2.5, ZnO 0-2.5, B2O30-1.0, Al2O319-25, SiO255-69, TiO21-3, ZrO21-2.5, SnO20-0.4, ΣSnO2+TiO2<3, P2O50-3.0, Nd2O30.01-0.4, CoO 0.0-0.004.
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Grewer Petra
Rodek Erich
Schiffner Ulrich
Schmidbauer Wolfgang
Schönberger Klaus
Lorengo Jerry
Millen White Zelano & Branigan P.C.
Schott AG
Wiese Noah S
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