Optical glass and optical element

Details Optical glass and optical element Optical glass and optical element

2005-04-13

2009-06-02

Group, Karl E (Department: 1793)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S066000

Reexamination Certificate

active

07541302

ABSTRACT:
Optical glass which is suitable for press molding does not substantially contain a compound of lead or arsenic, and has intermediate refractive index, low dispersion properties, low Tg and small density. Concretely, the optical glass includes the glass components of SiO2: 20 to 45%, B2O3: 15 to 40%, Al2O3: 4 to 15%, MgO: 0 to 10% (including 0), CaO: 13 to 25%, MgO+CaO: 13 to 25%, Li2O: 12.5 to 25%, Na2O: 0 to 10% (including 0), K2O: 0 to 10% (including 0), Li2O+Na2O+K2O: 12.5 to 25%, SrO: 0 to 10% (including 0), BaO: 0 to 5% (including 0), and Sb2O3: 0 to 1% (including 0).

REFERENCES:
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patent: 7166549 (2007-01-01), Fechner et al.
patent: 7351675 (2008-04-01), Kasuga et al.
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patent: 60-036348 (1985-02-01), None
patent: 60-122747 (1985-07-01), None
patent: 60221338 (1985-11-01), None
patent: 2000-302479 (2000-10-01), None
patent: 2003-089543 (2003-03-01), None
Derwent Abstract 1985-319327, English abstract of JP 60-221338 A, Nov. 6, 1985.

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