Method of making polarized ophthalmic glass

Details Method of making polarized ophthalmic glass Method of making polarized ophthalmic glass

1980-12-19

1982-07-13

Fisher, Richard V.

Glass manufacturing

Processes

Operating under inert or reducing conditions

65 61, 65 64, 65105, 65106, 65107, C03B 23025, C03B 23037

Patent

active

043392563

ABSTRACT:
Polarized ophthalmic glass lenses are made from conventional ophthalmic glass. This is accomplished by heating a sheet of ophthalmic glass, which includes a reducible metal oxide as part of its composition, to its softening point in a reducing atmosphere for a time interval sufficient to reduce the metal oxide to metal to a predetermined depth on at least one surface of the sheet. Following this reduction of the metal oxide, the sheet is held at an elevated temperature to permit the reduced oxides to nucleate. Then, the sheet is stretched in one direction to elongate the nucleated metal particles in parallel lines. The glass then is shaped, cut into lenses, permitted to cool, and the outer surface of the lens blanks are ground and polished in a conventional manner, leaving the stretched elongated metal particles on the inner surface thereof to create polarized ophthalmic lenses.

REFERENCES:
patent: 3653863 (1972-04-01), Araujo et al.
patent: 3765853 (1973-10-01), Riebling
patent: 3892582 (1975-07-01), Simms
patent: 4088470 (1978-05-01), Bourg et al.
patent: 4304584 (1981-12-01), Borrelli et al.

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