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US5244470A
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Method for marking a water-absorptive contact lens: dyeing dry lens with a mark using reduced vat dye and then making the dye insoluble
Assignee: Tomei Sangyo KK
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Filing: 1992-01-28
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Granted: 1993-09-14
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Expires: 2012-01-28
Abstract
Abstract A method for tinting a water-absorptive contact lens to have a mark tinted thereon, which comprises superimposing on a water-absorptive contact lens in the dry state a screen provided with a tinting pattern corresponding to the mark to be tinted on the contact lens, applying to the contact lens through the tinting pattern of the screen a dye solution containing a vat dye and an alkaline reducing agent, followed by insolubilizing the vat dye.
Inventors
- 👤 Koji Onda
- 👤 Toshihisa Sakai
- 👤 Yasuhiro Yokoyama
- 👤 Takanori Shibata
- 👤 Yasuyuki Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:16
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00865; B29D11/00894; B29D11/00903; B29D11/00009; B29D11/00038; D; D06; D06P; D06P1/00; D06P1/22; D06P1/221; G; G02; G02C; G02C7/00; G02C7/02; G02C7/021
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
74 words
A method for marking a water-absorptive contact lens to have a mark tinted thereon, which comprises superimposing on a water-absorptive contact lens in the dry state a screen provided with a tinting pattern corresponding to the mark to be tinted on the contact lens, applying to the contact lens through the tinting pattern of the screen a dye solution containing a vat dye and an alkaline reducing agent, followed by insolubilizing the vat dye.
Claim 2
Independent Claim
74 words
A method for marking a water-absorptive contact lens to have a mark tinted thereon, which comprises superimposing on a water-absorptive contact lens in the dry state a screen provided with a tinting pattern corresponding to the mark to be tinted on the contact lens, applying to the contact lens through the tinting pattern of the screen a dye solution containing a vat dye and an alkaline reducing agent, followed by insolubilizing the vat dye.
Claim 3
Dependent Claim
21 words
The method according to claim 1, wherein the dye solution contains from 0.05 to 2.0% by weight of the vat dye.
Claim 4
Dependent Claim
35 words
The method according to claim 1, wherein the alkaline reducing agent comprises an alkali base material and a reducing agent, each in an amount of from 0.05 to 10.0% by weight in the dye solution.
Claim 5
Dependent Claim
36 words
The method according to claim 1, wherein the dye solution is an aqueous solution containing from 1 to 90% by weight of an organic solvent selected from the group consisting of methanol, ethanol, acetone, and acetonitrile.
Claim 6
Dependent Claim
20 words
The method according to claim 1, wherein the dye solution contains not more than 10% by weight of a thickener.
Claim 7
Dependent Claim
18 words
The method according to claim 1, wherein the insolubilization of the vat dye is conducted by oxidation treatment.
Claim 8
Dependent Claim
19 words
The method according to claim 6, wherein the oxidation treatment is conducted in air or in water under heating.
References Cited (Backward Citations)
GB1583492A
Cited
US4238524A
Cited
US4494954A
Cited
US4518390A
Cited
US4777684A
Cited
JPS63264719A
Cited
US4981487A
Cited
US4898695A
Cited
JPH03107121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-13 | 1997-03-15 | 1997-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-13 | 2001-03-15 | 2001-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-13 | 2005-03-15 | 2005-09-14 | $7700.00 | Window Closed / Lapsed |