Process of producing soft aperture filter

Details Process of producing soft aperture filter Process of producing soft aperture filter

1976-12-16

1978-08-22

Bashore, S. Leon

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 33, 65 37, 65 60C, 65 61, 106 52, 350205, 350319, C03C 1500, C03B 1108, C03C 1900

Patent

active

041086210

ABSTRACT:
A process for producing a soft aperture filter having high acid and heat resistance as well as a desired colored layer thickness comprising heat-treating a glass, having a base composition of 55 to 72 mole percent SiO.sub.2, 15 to 35 mole percent Na.sub.2 O, 0 to 5 percent di-valent oxides other than ZnO, 4 to 15 mole percent ZnO, and 0 to 5 mole percent Al.sub.2 O.sub.3 with Sb.sub.2 O.sub.3 and/or As.sub.2 O.sub.3 additionally present in an amount of 2 to 5 weight percent of the base composition, in a fused bath containing 14 to 60 mole percent of a silver salt, and optionally with NaNO.sub.3 and/or Na.sub.2 SO.sub.4.

REFERENCES:
patent: 3954487 (1976-05-01), Gliemeroth et al.
patent: 4022628 (1977-05-01), Deeg

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