Lead-free and preferably arsenic-free lanthanum heavy flint...

Details Lead-free and preferably arsenic-free lanthanum heavy flint... Lead-free and preferably arsenic-free lanthanum heavy flint...

2006-08-15

2006-08-15

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S079000

Reexamination Certificate

active

07091145

ABSTRACT:
The lead-free and arsenic-free optical glass has a refractive index ndof 1.84≦nd≦1.96 and an Abbé number νdof 27≦νd≦36, with good chemical resistance, excellent crystallization resistance and the following composition (in % by weight based on oxide): SiO2, 1 to 8, B2O3, 13 to 19.5, La2O3, 34 to 50; MgO, 0 to 6, CaO, 0 to 6, BaO, 0 to 6, ZnO, 0 to 9 with ΣMO, 1 to 10; and TiO2, 4 to 15, ZrO2, 0 to 11, Nb2O5, 6 to 14.5. In addition, the glass according to the invention, as well as having a maximum alkali metal oxide content of 10% by weight, may also contain standard refining agents other than arsenic. The glass according to the invention is used in imaging, projection, telecommunications, optical communication and/or laser technology.

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