EP0472303B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Contact lens casting
Assignee: PBH Inc
•
Filing: 1991-07-29
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Granted: 1995-10-25
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Expires: 2011-07-29
Abstract
No abstract record available.
Inventors
- 👤 John M Evans
- 👤 Ashrok Thakrar
- 👤 Peter Harold Stafford
- 👤 Norman M. Van Houten
- 👤 Richard Stuart Dr. Skipper
- 👤 John Thomas Phoenix
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 09:38
CPC Classifications
C; C07; C07C; C07C62/00; C07C62/30; C07C62/32; B; B29; B29C; B29C37/00; B29C37/0025; B29C37/0028; B29C37/0032; B29C59/00; B29C59/10; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00125; B29D11/00317; B29D11/00865; B29D11/00923; B29C39/00; B29K; B29K2105/00; B29K2105/0002; B29K2995/00; B29K2995/0018; B29K2995/002; B29L; B29L2011/00; B29L2011/0016; B29L2011/0041
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
The method of producing a contact lens comprising the steps of treating a surface of a hydrophobic lens casting mould with electrical corona discharge, selecting an active material which is insoluble in the monomer material to be used in the lens, dispersing said active material in a hydrophilic carrier system which is compatible with said monomer material, using the resulting dispersion to coat the electrical corona discharge treated surface of said casting mould, introducing a hydrophilic monomeric lens forming liquid in said mould in contact with said coated surface, polymerizing said liquid to produce a lens blank having an active material impregnated in said blank, adjacent an optical surface thereof, and subsequently removing said lens from said mould.
Claim 2
Dependent Claim
14 words
The method of Claim 1 in which the active material is a colouring material.
Claim 3
Dependent Claim
14 words
The method of Claim 1 in which the active material is a therapeutic agent.
Claim 4
Dependent Claim
55 words
The method of Claim 1 in which, area sections of the mould surface, whose area are within the area of the surface which corresponds to the pupil of the contact lens or the periphery surrounding the section to which the colouring/coloured pattern is applied, are masked during the electrical corona discharge treatment of the surface.
Claim 5
Independent Claim
37 words
The method as claimed in any one of the preceding claims in which said carrier system comprises a monomeric hydrogel forming material which is the same as the material from which the lens is to be made.
Claim 6
Independent Claim
115 words
The method of producing a coloured contact lens comprising the steps of treating the surface of a hydrophobic casting mould with electrical corona discharge, preparing a colouring dispersion comprising from 10 to 90% by weight of monomeric hydroxyethyl methacrylate and from 10 to 90% by weight of a colouring material which is insoluble in hydroxyethyl methacrylate, using the said dispersion to imprint a pattern on a surface of said treated casting mould, introducing additional hydroxyethyl methacrylate monomer in said mould in contact with said imprinted surface, polymerizing said monomer to produce a lens blank having a coloured pattern impregnated in said blank, adjacent an optical surface thereof, and subsequently removing said lens from said mould.
Claim 7
Dependent Claim
13 words
The method of Claim 6 in which said pattern is an iris pattern.
Claim 8
Independent Claim
61 words
The method as claimed in any one of the preceding claims in which area sections of the mould surface whose area are within the area of the surface which corresponds to the pupil of the contact lens or the periphery surrounding the section to which the colouring/coloured pattern is applied, are masked during the electrical corona discharge treatment of the surface.
References Cited (Backward Citations)
No citation records indexed.
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