Lead and arsenic free optical lanthanum borate glass

Details Lead and arsenic free optical lanthanum borate glass Lead and arsenic free optical lanthanum borate glass

2006-04-27

2009-12-29

Mayes, Melvin C (Department: 1793)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S051000, C501S078000, C501S077000, C501S049000, C501S050000

Reexamination Certificate

active

07638450

ABSTRACT:
The lead-free, fluorine-free and arsenic-free optical glass, which is useful in mapping, projection, telecommunication, optical communication engineering, and mobile drive and laser technology, has a refractive index of 1.75≦nd≦1.83, an Abbe number of 34≦Vd≦44, and Tg≦560° C. The glass is free of WO3and TeO2and has a composition in percent by weight based on oxide content of: SiO2, 0.5-8; B2O3, 10-25; ZnO, 10-22; La2O3, 23-34; Ta2O5, >15-25; Nb2O5, 0.5-15; Al2O3, 0-2; and can include optional ingredients, e.g. alkali and/or alkaline-earth oxides. In addition, a sum of B2O3and ZnO is 33 to 41% by weight and preferably a sum of La2O3+Ta2O5+Nb2O5+Y2O3+ZrO2is greater than 50% by weight.

REFERENCES:
patent: 4732875 (1988-03-01), Sagara
patent: 6797659 (2004-09-01), Uehara
patent: 6818578 (2004-11-01), Tachiwama
patent: 7091145 (2006-08-01), Wolff et al.
patent: 2002/0006857 (2002-01-01), Tachiwama
patent: 2003/0100433 (2003-05-01), Hayashi et al.
patent: 2003/0191008 (2003-10-01), Uehara
patent: 2003/0211929 (2003-11-01), Hayashi et al.
patent: 2004/0023787 (2004-02-01), Wolff et al.
patent: 2004/0145815 (2004-07-01), Endo
patent: 2006/0079389 (2006-04-01), Hayashi
patent: 2 257 635 (1973-06-01), None
patent: 31 02 690 (1982-08-01), None
patent: 35 34 575 (1986-04-01), None
patent: 36 05 668 (1986-08-01), None
patent: 101 26 554 (2002-01-01), None
patent: 1 236 694 (2002-09-01), None
patent: 2 841 237 (2003-12-01), None
patent: 56-5345 (1981-01-01), None
patent: 60221338 (1985-11-01), None
patent: 62-100449 (1987-05-01), None
patent: 2002173336 (2002-06-01), None
patent: 2003201142 (2003-07-01), None
patent: 2003238198 (2003-08-01), None
patent: 2003300751 (2003-10-01), None
JP Pub. No. 2003-238198, Nakayama Kazutoshi, Aug. 27, 2003. (Machine Translation).
Optical Glass, Description of Properties,Germany, 2007 (in English).

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