High index ophthalmic glasses

Details High index ophthalmic glasses High index ophthalmic glasses

1991-06-17

1992-11-10

Bell, Mark L.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

501 13, 501 61, 501 75, 501901, 501903, 351168, 351172, C03C 3108, C03C 3072, G02B 310

Patent

active

051628260

ABSTRACT:
This invention relates to the production of glasses exhibiting a refractive index between about 1.66-1.81, a softening point between about 625.degree.-675.degree. C., a strain point between about 455.degree.-490.degree. C., a linear coefficeint of thermal expansion (25.degree.-300.degree. C.) between about 53-65.times.10.sup.-7 /.degree.C., and good chemical durability which consist essentially, in weight percent, of:

REFERENCES:
patent: 3973976 (1976-08-01), Boyd
patent: 4211569 (1980-07-01), Hares et al.
patent: 4721690 (1988-01-01), Ross et al.

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