Method of producing contact lens with identifying mark permeatin

Details Method of producing contact lens with identifying mark permeatin Method of producing contact lens with identifying mark permeatin

1994-09-28

1996-12-03

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Composite or multiple layer

264 26, 264 27, B29D 1100

Patent

active

055804985

ABSTRACT:
A method of producing a contact lens provided with an identifying mark is disclosed. According to this method, a printing liquid is first prepared by dissolving a pigment in an organic solvent which is permeable into a lens material for the contact lens. This printing liquid is applied to a predetermined portion of a lens surface of the contact lens, such that the printing liquid permeates into an interior of the lens, thereby to form a colored region on the lens surface. The colored region thus formed consists of a first portion permeating into the interior of the lens, and a second portion protruding from the lens surface. Then, the second portion of the colored region is removed so as to smooth the lens surface, whereby the identifying mark is constituted by the first portion of the colored region.

REFERENCES:
patent: 4145125 (1979-03-01), Chika
patent: 4194814 (1980-03-01), Fischer et al.
patent: 4447474 (1984-05-01), Neefe
patent: 4898695 (1990-02-01), Doshi
patent: 5034166 (1991-07-01), Rawlings
Week 8738, Derwent Publications Ltd., London, GB; AN 267630 & JP-A-62 186 221 (Tome Sangyo KK) Aug. 14, 1987.
Week 9215, Derwent Publications Ltd., London, GB; AN 118039 & JP-A-4 057 980 (Showa Denko) Feb. 25, 1992.

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