Method of making hardened ophthalmic lenses by ion exchange

Details Method of making hardened ophthalmic lenses by ion exchange Method of making hardened ophthalmic lenses by ion exchange

1975-09-08

1977-07-19

Bashore, S. Leon

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

106 47Q, C03C 1500

Patent

active

040366235

ABSTRACT:
Ophthalmic lenses formed of ophthalmic glass and having accurately finished front and back curved surfaces and edged to the shapes desired are heated in molten salt bath and ion-exchange hardened on all surfaces thereof so as to satisfy high safety standards while being substantially free from optical image distortions for objects viewed therethrough. The invention includes method and apparatus for rapid and controlled pre-heating, soaking and cooling steps of lenses relatively cheaply and in sizable numbers at the same time.

REFERENCES:
patent: 3287200 (1966-11-01), Hess et al.
patent: 3445316 (1969-05-01), Megles
patent: 3615323 (1971-10-01), Cornelissen et al.
patent: 3661545 (1972-05-01), Bartholomew
patent: 3687649 (1972-08-01), Bourgeaux
patent: 3751238 (1973-08-01), Grego et al.
patent: 3954487 (1976-05-01), Gliemeroth et al.
"Glass: The Miracle Maker", by C. J. Phillips Pitman Pub. Corp., New York,, 1943, pp. 97-100.

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