Patent US4715899A successfully refreshed from Google Patents.
US4715899A
Expired / Lapsed
US
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Liquid cleaner containing inactivated protease for protein soiled contact lenses
Assignee: Individual
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Filing: 1984-04-11
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Granted: 1987-12-29
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Expires: 2004-04-11
Abstract
Abstract Protein soiled contact lenses are conveniently cleaned by the concurrent use of an aqueous solution containing an inactivated sulfhydryl protease and an aqueous mild thio reducing agent. The protease is allosterically inactivated by reaction with sodium tetrathionate.
Inventors
- 👤 Subir Chanda
- 👤 Thomas M. Riedhammer
- 👤 Andrew M. Tometsko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:07
CPC Classifications
A; A61; A61L; A61L12/00; A61L12/08; A61L12/082; C; C11; C11D; C11D3/00; C11D3/0005; C11D3/0078; C11D3/16; C11D3/38; C11D3/386; C11D7/00; C11D7/02; C11D7/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
13 words
A process for removing proteinaceous deposits on contact lenses comprising the steps of:
Claim 2
Dependent Claim
13 words
A process for removing proteinaceous deposits on contact lenses comprising the steps of:
Claim 3
Dependent Claim
97 words
(i) contacting said contact lens with an aqueous solution of a mild thiol reducing agent wherein the aqueous solution is isotonic to the human eye and said thiol reducing agent is selected from group consisting of: cysteine, mercaptoethanol, sodium thiosulfate, ascorbic acid, glutathione and mixtures thereof; (ii) admixing with said solution containing said lens an effective amount of an allosterically inactivated sulfhydryl protease, to remove said proteinaceous deposit from said lens, said protease having been inactivated by reaction with sodium tetrathionate; and (iii) allowing said lens to remain in the admixture until said proteinaceous deposit is removed.
Claim 4
Dependent Claim
97 words
(i) contacting said contact lens with an aqueous solution of a mild thiol reducing agent wherein the aqueous solution is isotonic to the human eye and said thiol reducing agent is selected from group consisting of: cysteine, mercaptoethanol, sodium thiosulfate, ascorbic acid, glutathione and mixtures thereof; (ii) admixing with said solution containing said lens an effective amount of an allosterically inactivated sulfhydryl protease, to remove said proteinaceous deposit from said lens, said protease having been inactivated by reaction with sodium tetrathionate; and (iii) allowing said lens to remain in the admixture until said proteinaceous deposit is removed.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the reducing agent is cysteine.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the reducing agent is mercaptoethanol.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the reducing agent is sodium thiosulfate.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein the reducing agent is ascorbic acid.
Claim 9
Dependent Claim
11 words
The process of claim 1 wherein the reducing agent is glutathione.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein the inactivated sulfhydryl protease is added to the solution as an aqueous solution.
Claim 11
Dependent Claim
19 words
The process of claim 1 wherein the inactivated sulfhydryl protease is added to the solution as a tabletted material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-28 | 1991-06-29 | 1991-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-28 | 1995-06-29 | 1995-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-28 | 1999-06-29 | 1999-12-29 | $7700.00 | Window Closed / Lapsed |