Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Reexamination Certificate
2007-10-23
2007-10-23
Group, Karl (Department: 1755)
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
C501S004000, C065S033800, C065S033900
Reexamination Certificate
active
11592695
ABSTRACT:
The present invention relates to glass, glass-ceramic materials, lamp reflectors and processes for making them. The glass material has a composition, by weight of the total composition, comprising 56-67% SiO2; 9-22% Al2O3; 3.4-3.8% Li2O; 1.8-2.6% ZnO; 1.5-2.5% MgO; 3.3-5% TiO2; 0-2.5% ZrO2; 1.5-3% B2O3; 0-6% P2O5; 0-0.6% F; less than 500 ppm Fe; and components resulting from effective amount of at least one refining agent. The glass-ceramic material of the present invention contains β-spodumene solid solution as the predominant crystalline phase, and can be obtained by proper thermal treatment of the glass-ceramic material.
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Horsfall William E.
Stewart Ronald L.
Chen Siwen
Corning Incorporated
Group Karl
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