Filter gas
AssigneeSchott AG
InventorsBianca Schreder, Ute Woelfel, Stefanie Hansen
Life of this patent
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Abstract
The invention relates to a filter glass comprising Na2O and K2O and the following (in % by weight on an oxide basis): P2O5 58-68 Al2O3 5-10 CuO 8-15 V2O5 0.05-1 SiO2 <2 F <1 Total R′O (R′ = Mg, Ca, Sr, Ba) 0-11 Total R2O (R = Li, Na, K) 3-17.
Claims25
Filter glass comprising Na2O and K2O and the following (in % by weight on an oxide basis):
- P2O5
- 58-68
- Al2O3
- 5-10
- CuO
- 8-15
- V2O5
- 0.05-1
- SiO2
- <2
- F
- <1
- Total R′O (R′ = Mg, Ca, Sr, Ba)
- 0-11
- Total R2O (R = Li, Na, K)
- 3-17
- wherein a ratio of K2O (in % by weight)/Na2O (in % by weight) is >1.
Filter comprising a filter glass, the filter glass comprising Na2O and K2O and the following (in % by weight on an oxide basis):
- P2O5
- 58-68
- Al2O3
- 5-10
- CuO
- 8-15
- V2O5
- 0.05-1
- SiO2
- <2
- F
- <1
- Total R′O (R′ = Mg, Ca, Sr, Ba)
- 0-11
- Total R2O (R = Li, Na, K)
- 3-17
- wherein a ratio of K2O (in % by weight)/Na2O (in % by weight) is >1.
Filter glass having, at a sample thickness of 0.11 mm, an internal transmission τi at a wavelength of 400 nm of more than 85%, and a T50 value in the range 625 nm to 640 nm, wherein the filter glass is a vanadium oxide containing phosphate-glass comprising CuO at a content of 8-15% by weight and comprising La2O3 at a content of 0.1-4% by weight.
Filter glass having, at a sample thickness of 0.11 mm, an internal transmission τi at a wavelength of 400 nm of more than 85%, and a T50 value in the range 625 nm to 640 nm, wherein the filter glass is a vanadium oxide containing phosphate-glass comprising CuO at a content of 8-15% by weight, wherein a ratio of K2O (in % by weight)/Na2O (in % by weight) is >1.
Dependencies are inferred from the claim text.