Optical glass and optical element

Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...

Reexamination Certificate

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C501S073000, C501S077000, C501S079000

Reexamination Certificate

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07947618

ABSTRACT:
An optical glass contains, based on a total weight of the optical glass: 12 to 30 weight percent of P2O5; 1 to 5 weight percent of B2O3; 1 to 8 weight percent of Li2O; 0.5 to weight percent of Na2O; 0.5 to 15 weight percent of K2O; 1 to 5 weight percent of CaO; 0 to 20 weight percent of BaO; 0 to 5 weight percent of SrO; 1 to 10 weight percent of TiO2; 1 to 20 weight percent of Bi2O3; 3 to 35 weight percent of Nb2O5; 13 to 60 weight percent of WO3; and 0 to 1 weight percent of Sb2O3, wherein a total weight of Na2O and K2O is in a range of 3 to 20 weight percent based on the total weight of the optical glass.

REFERENCES:
patent: 4055435 (1977-10-01), Sagara
patent: 5744409 (1998-04-01), Hashimoto et al.
patent: 5919718 (1999-07-01), Hirota et al.
patent: 6776007 (2004-08-01), Hirota et al.
patent: 2000-001329 (2000-01-01), None
patent: 2003089543 (2003-03-01), None
patent: 2004137145 (2004-05-01), None

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