Glass for a light filter and a light filter

Details Glass for a light filter and a light filter Glass for a light filter and a light filter

2006-02-28

2006-02-28

Jones, Deborah (Department: 1775)

Stock material or miscellaneous articles

Composite

Of quartz or glass

C428S432000, C428S689000, C428S699000, C428S701000, C428S702000, C501S055000, C501S063000, C501S068000, C501S069000, C501S072000, C501S078000, C501S079000, C501S103000, C501S104000

Reexamination Certificate

active

07005187

ABSTRACT:
Glass for a light filter capable of preventing variation of refractive index in a band-pass filter has a coefficient of thermal expansion within a range from 90×10−7/° C. within a temperature range from −20° C. to +70° C. and, preferably, Young's modulus of 75 GPa or over and Vickers hardness of 550 or over, and light transmittance for plate thickness of 10 mm of 90% or over within a wavelength range from 950 nm to 1600 nm.

REFERENCES:
patent: 3898093 (1975-08-01), Faulstich et al.
patent: 4390638 (1983-06-01), Mennemann et al.
patent: 4444893 (1984-04-01), Mader et al.
patent: 4525425 (1985-06-01), Church
patent: 5699189 (1997-12-01), Murphy
patent: 5719989 (1998-02-01), Cushing

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