Method of marking ophthalmic lenses of organic material and lens

Details Method of marking ophthalmic lenses of organic material and lens Method of marking ophthalmic lenses of organic material and lens

1978-10-13

1981-03-24

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

8471, 8506, 8509, 8515, 8648, D06P 300, G02C 702

Patent

active

042576920

ABSTRACT:
A method of marking an ophthalmic lens of organic material and the lens so marked. A marking substance containing an optical brightener which is a derivative of benzoxazolyls stilbenes, or benzotriazoles is mixed with a suitable binder and solvent and applied to a surface of the lens to be marked by thermal transfer from a transfer support. The marking substance is shaped to the desired configuration either when applied to the transfer support or by a mask defining the mark or indicia to be applied. Heat is applied to the marking substance and the lens which sublimes the optical brightener which then penetrates into the organic material of the lens to be anchored therein. The resultant indicia or mark provides a permanent marking of the lens and is only visible in ultra-violet light.

REFERENCES:
patent: 2929931 (1960-03-01), Richter et al.
patent: 3872042 (1975-03-01), Bond
patent: 4059471 (1977-11-01), Haigh
patent: 4137042 (1979-01-01), De'fago et al.

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