Glasses of high refractive index, low dispersion, and low densit

Details Glasses of high refractive index, low dispersion, and low densit Glasses of high refractive index, low dispersion, and low densit

1982-12-01

1983-09-13

McCarthy, Helen M.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 79, 501903, C03C 308

Patent

active

044042906

ABSTRACT:
This invention relates to the production of glasses especially suitable for ophthalmic lenses, the glasses exhibiting refractive indices between about 1.695-1.705, dispersive indices between about 40.5-43.2, densities below about 3.2 g/cm.sup.3, weight losses as measured in the AO test of less than 0.15 mg/cm.sup.2, transmittances at 400 nm in 10 mm thickness of at least 75%, and consisting essentially, in weight percent of

REFERENCES:
patent: 4055435 (1977-10-01), Sagara
patent: 4084978 (1978-04-01), Sagara
patent: 4252567 (1981-02-01), Ishibashi et al.

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