Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1992-10-06
1994-06-14
Group, Karl
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
501903, C03C 3078
Patent
active
053209877
ABSTRACT:
An optical glass which is a SiO.sub.2 --TiO.sub.2 --K.sub.2 O--RO (where R represents Mg, Ca, Sr, Ba and Zn metal elements) system glass of a specific content range exhibits optical constants of a refractive index (Nd) of about 1.58-1.78 and Abbe number (.nu.d) of about 28-45, is free of PbO and has an improved property against devitrification.
REFERENCES:
patent: 3589918 (1971-06-01), Jahn
patent: 4526874 (1985-07-01), Grabowski geb. Marszalek et al.
patent: 4812423 (1989-03-01), Kodama et al.
Nakahara Muneo
Senoo Tatsuya
Yamaguchi Katsuhiko
Group Karl
Kabushiki Kaisha Ohara
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