Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1989-02-13
1991-02-26
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
501 74, 501 75, 501 76, 501 77, 501 79, 501903, C03C 3062, C03C 400
Patent
active
049961730
ABSTRACT:
The optical glass of the present invention comprising SiO.sub.2, alkali metal oxides, P.sub.2 O.sub.5 and Nb.sub.2 O.sub.5 has optical properties of 1.70 or more in refractive index nd and 30 or less in Abbe's number .nu.d and is superior in devitrification resistance and stability.
REFERENCES:
patent: 3870531 (1975-03-01), Jahn
patent: 3922155 (1975-11-01), Broemer et al.
patent: 4390638 (1983-02-01), Mennemann et al.
patent: 4508834 (1985-04-01), Gliemeroth
patent: 4839314 (1989-06-01), Boudot et al.
Bell Mark L.
Hoya Corporation
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