Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Reexamination Certificate
2006-08-15
2006-08-15
Group, Karl (Department: 1755)
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
C501S007000, C428S426000, C428S428000, C428S702000
Reexamination Certificate
active
07091141
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-quartz solid solution as the predominant crystalline phase, and can be obtained by proper thermal treatment of the glass-ceramic material. The glass-ceramic material is particularly suitable for heat-resistant lamp reflectors which require a high surface smoothness Ra of lower than 75 nm, a low CTE between 25 and 300° C. of less than 10×10−7K−1, and IR transmission at about 1050 nm of over 80% at a thickness of 3 mm.
REFERENCES:
patent: 3642504 (1972-02-01), Petzold et al.
patent: 4438210 (1984-03-01), Rittler
patent: 4755488 (1988-07-01), Nagashima
patent: 5154943 (1992-10-01), Etzkorn et al.
patent: 5236511 (1993-08-01), Etzkorn et al.
patent: 5446008 (1995-08-01), Krolla et al.
patent: 5496586 (1996-03-01), Morsen et al.
patent: 5503677 (1996-04-01), Morsen et al.
patent: 6354900 (2002-03-01), Ohshima et al.
patent: 6629768 (2003-10-01), Melson et al.
patent: 6673729 (2004-01-01), Siebers et al.
patent: 2002/0183187 (2002-12-01), Siebers et al.
patent: 2003/0052606 (2003-03-01), Ikeda et al.
patent: 04-348302 (1992-12-01), None
patent: 04-367538 (1992-12-01), None
patent: WO 03/033960 (2003-04-01), None
Beall, GH., Design of Glass-Ceramics, Reviews of Solid State Science, vol. 3, Nos. 3 & 4 (1989) 333-354.
Monch et al., Optimized Light Sources for Projection Displays, Philips Research Laboratories, Aachen, Germany, SID 99 Digest, 1076-1079.
Horsfall William E.
Stewart Ronald L.
Chen Siwen
Corning Incorporated
Group Karl
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