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Patent US4127423A successfully refreshed from Google Patents.
US4127423A
Expired / Lapsed
US
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Contact lens cleaning solution
Assignee: Alcon Vision LLC
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Filing: 1977-09-13
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Granted: 1978-11-28
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Expires: 1997-09-13
Abstract
Abstract Silicone and/or hydrophilic soft contact lenses are freed of proteinaceous and other deposits by rubbing them with an aqueous solution of a crystalline sodium silicate having a pH of 10.2 - 10.9 and rinsing. The solution may contain in addition sodium chloride in isotonic amount, viscosity agents, wetting agents, detergents and bactericides.
Inventors
- 👤 Billy F. Rankin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:23
CPC Classifications
A; A61; A61L; A61L12/00; A61L12/08; C; C11; C11D; C11D3/00; C11D3/0005; C11D3/0078; C11D7/00; C11D7/02; C11D7/04; C11D7/10; C11D7/14
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
98 words
A composition for cleaning hydrophobic silicone or hydrophilic soft contact lenses, comprising a solution in deionized distilled water of 0.2-1.5% of a sodium silicate having a SiO 2 :Na 2 O ratio of 1:1 to 4:1, an isotonic amount of sodium chloride, about 0.5 to 0.3 of ethylenediamine tetraacetic acid, about 0.4-0.9% a cellulose derivative viscosity control agent, about 0.5-0.9% of polyvinylalcohol, about 0.1-0.4% of a non-ionic detergent about .002-.005% of a bactericide, and the balance deionized or distilled water, all percentage being by weight, and sufficient dilute HCl to achieve a pH of about 10.2 to 10.9.
Claim 2
Dependent Claim
98 words
A composition for cleaning hydrophobic silicone or hydrophilic soft contact lenses, comprising a solution in deionized distilled water of 0.2-1.5% of a sodium silicate having a SiO 2 :Na 2 O ratio of 1:1 to 4:1, an isotonic amount of sodium chloride, about 0.5 to 0.3 of ethylenediamine tetraacetic acid, about 0.4-0.9% a cellulose derivative viscosity control agent, about 0.5-0.9% of polyvinylalcohol, about 0.1-0.4% of a non-ionic detergent about .002-.005% of a bactericide, and the balance deionized or distilled water, all percentage being by weight, and sufficient dilute HCl to achieve a pH of about 10.2 to 10.9.
Claim 3
Dependent Claim
87 words
The composition of claim 1 wherein the sodium chloride is present in the amount of about 0.458%, the cellulose derivative is selected from the group consisting of hydroxyethylcellulose, methylcellulose, hydroxypropylcellulose, carboxymethylcellulose and hydroxypropylmethylcellulose, the non-ionic detergent is selected from the group consisting of tyloxapol, ethylene oxide - propylene oxide - propylene glycol condensation products and polyalkylene oxide derivatives of sorbitan mono esters of higher fatty acids having an HCB factor of 12 or more and the bactericide is selected from the group consisting of thimersol and chlorhexidine.
Claim 4
Dependent Claim
50 words
The composition of claim 2 consisting essentially in percent by weight, ______________________________________
Sodium Chloride .458
[EDTA] Ethylenediamine-
0.1
tetraacetic acid
Hydroxyethylcellulose 0.8
Polyvinylalcohol 0.75
Sodium Silicate 0.5
tyloxapol 0.2
thimersol .004
Distilled or Deionized Water
balance to 100%
Dilute HC1 to bring the pH to about 10.2 to 10.9
______________________________________
Claim 5
Independent Claim
55 words
A method of cleaning proteinaceous and other tear deposits from hydrophilic or hydrophobic soft contact lenses which comprises applying to said lenses a few drops of an aqueous solution containing about 0.2-1.5% of a cystalline sodium silicate, said solution having a pH of about 10.2-10.9, rubbing the lenses with the fingers and rinsing with water.
Claim 6
Independent Claim
55 words
A method of cleaning proteinaceous and other tear deposits from hydrophilic or hydrophobic soft contact lenses which comprises applying to said lenses a few drops of an aqueous solution containing about 0.2-1.5% of a cystalline sodium silicate, said solution having a pH of about 10.2-10.9, rubbing the lenses with the fingers and rinsing with water.
Claim 7
Independent Claim
59 words
A method of cleaning proteinaceous and other tear deposits from hydrophilic or hydrophobic soft contact lenses which method comprises heating said lenses in an aqueous solution having a pH of about 10.2 to 10.9 and containing about 0.2 to 1.5% by weight of a crystalline sodium silicate, removing the lenses and rinsing the lenses with deionized or distilled water.
Claim 8
Independent Claim
59 words
A method of cleaning proteinaceous and other tear deposits from hydrophilic or hydrophobic soft contact lenses which method comprises heating said lenses in an aqueous solution having a pH of about 10.2 to 10.9 and containing about 0.2 to 1.5% by weight of a crystalline sodium silicate, removing the lenses and rinsing the lenses with deionized or distilled water.
Claim 9
Dependent Claim
23 words
The method of claim 5 wherein the solution containing the lenses is heated to a temperature of from about 40° to 100° C.
Claim 10
Dependent Claim
18 words
The method of claim 6 wherein the solution containing the lenses is heated for 1 to 5 minutes.
Claim 11
Dependent Claim
14 words
The method of claim 4 wherein the aqueous solution is that of claim 2.
Claim 12
Dependent Claim
14 words
The method of claim 4 wherein the aqueous solution is that of claim 3.
Claim 13
Dependent Claim
14 words
The method of claim 5 wherein the aqueous solution is that of claim 2.
Claim 14
Dependent Claim
14 words
The method of claim 5 wherein the aqueous solution is that of claim 3.
Claim 15
Dependent Claim
23 words
The method of claim 11 wherein the solution containing the lenses is heated to a temperature of from about 40° to 100° C.
Claim 16
Dependent Claim
18 words
The method of claim 12 wherein the solution containing the lenses is heated for 1 to 5 minutes.
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) | 1981-11-27 | 1982-05-29 | 1982-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-27 | 1986-05-29 | 1986-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-27 | 1990-05-29 | 1990-11-28 | $7700.00 | Window Closed / Lapsed |