US5244470A
Expired / Lapsed
US
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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 05:04
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.
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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) | 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 |