US5516467A
Expired / Lapsed
US
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Process for producing a tinted contact lens
Assignee: Menicon Co Ltd
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Filing: 1994-07-15
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Granted: 1996-05-14
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Expires: 2014-07-15
Abstract
Abstract A process for producing a tinted contact lens, which includes dissolving a soluble vat dye in a monomer capable of dissolving the soluble vat dye therein, mixing the monomer having the soluble vat dye dissolved therein and other monomers, polymerizing the monomer mixture and processing the resulting polymer into a shape of a contact lens.
Inventors
- 👤 Kazuharu Niwa
- 👤 Yoshitaka Taniyama
- 👤 Noriko Iwata
- 👤 Yasuhiro Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:16
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22; D06P1/28; B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00865; B29D11/00894; B29D11/00903; B29D11/00913; C; C09; C09B; C09B5/00; C09B5/24; C09B5/44; C09B5/46; C09B5/48; D06P3/00; D06P3/34; D06P3/343; G; G02; G02C; G02C7/00; G02C7/02; G02C7/021
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A process for producing a tinted contact lens, which comprises: (a) dissolving a solubilised vat dye in one or more monomers capable of dissolving the solubilised vat dye therein, said one or more monomers comprising, at least, N,N,-dimethyl acrylamide or N,N-dimethyl(meth)acrylamide; (b) mixing the one or more monomers having said solubilised vat dye dissolved therein and other monomers; (c) polymerizing the monomer mixture; and (d) processing the resulting polymer into a shape of a contact lens.
Claim 2
Dependent Claim
76 words
A process for producing a tinted contact lens, which comprises: (a) dissolving a solubilised vat dye in one or more monomers capable of dissolving the solubilised vat dye therein, said one or more monomers comprising, at least, N,N,-dimethyl acrylamide or N,N-dimethyl(meth)acrylamide; (b) mixing the one or more monomers having said solubilised vat dye dissolved therein and other monomers; (c) polymerizing the monomer mixture; and (d) processing the resulting polymer into a shape of a contact lens.
Claim 3
Dependent Claim
35 words
The process of claim 1, wherein the solubilised vat dye is an alkali metal salt of a leuco sulfate ester of a vat dye selected from the group consisting of anthraquinone, anthrone, indigo and thioindigo.
Claim 4
Dependent Claim
35 words
The process of claim 1, wherein the concentration of the solubilised vat dye in the monomer mixture is from 0.01 to 1 wt % based on the total weight of the monomers to be polymerzied.
Claim 5
Dependent Claim
20 words
The process of claim 1, wherein the monomer capable of dissolving the solublised vat dye therein is N,N-dimethyl (meth) acrylamide.
Claim 6
Dependent Claim
18 words
The process of claim 1, wherein the monomer capable of dissolving the solubilised vat dye is N,N-dimethyl acrylamide.
Claim 7
Dependent Claim
41 words
The process of claim 1, wherein said leuco sulfate ester is selected from the group consisting of 7, 16-dichloro-6,15-dihydro-5,9,14,18-anthrazinetetrone, 16,23-dihydrodinaphtho (2,3-a:2',3'-i) naphth (2',3':6,7) indole (2,3-c) carbazole -5,10,15,17,22, 24-hexone, N,N'-(9,10-dihydro-9,10-dioxo-1,5-anthracenediyl) bisbenzamide, 16,17-dimethoxydinaphtho (1,2,3-cd:3',2'1'-1n) perylene-5,10-dione and 6-ethoxy-2-(6-ethoxy-3-oxobenzo (b) thien-2(3H)-ylidene) genzo (b) thiophen-3-(2H) one.
Claim 8
Dependent Claim
24 words
The process of claim 3, wherein the concentration of the solubilised vat dye in the monomer mixture is from 0.03 to 0.3 wt. %.
Claim 9
Dependent Claim
24 words
The process of claim 1, wherein said other monomers are hydrophilic monomers selected from the group consisting of N-vinyl-2-pyrrolidone, 2-hydroxyethyl (meth)acrylate and (meth)acrylic acid.
Claim 10
Dependent Claim
35 words
The process of claim 1, wherein said other monomers are hydrophobic monomers selected from the group consisting of methyl (meth)acrylate, styrene, t-butylstyrene, trifluoroethyl (meth) acrylate, hexafluoroisopropyl (meth) acrylate and tris (trimethylsiloxy) silyl propyl (meth) acrylate.
Claim 11
Dependent Claim
27 words
The process of claim 8 or 9, which further comprises adding monomers selected from the group consisting of ethylene glycol di(meth)acrylate, ally (meth)acrylate, divinylbenzene and vinylbenzyl (meth)acrylate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-14 | 1999-11-13 | 2000-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-14 | 2003-11-13 | 2004-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-14 | 2007-11-13 | 2008-05-14 | $7700.00 | Window Closed / Lapsed |