US4599195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solution and method for removing protein, lipid, and calcium deposits from contact lenses
Assignee: Alcon Research LLC
•
Filing: 1984-12-28
•
Granted: 1986-07-08
•
Expires: 2004-12-28
Abstract
Abstract A nontoxic, aqueous, contact lens cleaning solution containing a mixture which includes a nonionic or weakly anionic surfactant, a chelating agent, a source of hydrated protons, and optionally also urea; and a method of chemically removing protein, lipid and calcium deposits from contact lens utilizing this solution are described.
Inventors
- 👤 Doris Schafer
- 👤 Rolf Schafer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:41
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/0005; C11D3/0078; C11D1/00; C11D1/02; C11D1/04; C11D1/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
133 words
An aqueous contact lens cleaning solution, comprising an effective amount of an anionic surfactant formula: R-O-(CH.sub.2 -CH.sub.2 -O).sub.z -CH.sub.2 -COOH in which R is a C 8 to C 18 hydrocarbon chain and z is a whole number from 1 to 25; an effective amount of a calcium chelating agent selected from the group consisting of citric acid, ethylenediaminetetraacetic acid and combinations thereof; and a source of hydrated protons to facilitate removal of protein deposits from contact lenses, said source of hydrated protons comprising an acid capable of providing free hydrogen ions when in solution at acid pH in an amount sufficient to render the aqueous contact lens cleaning solution slightly acidic, said acid being selected from the group consisting of citric acid, ethylenediaminetetraacetic acid, sodium dihydrogen phosphate, gluconic acid and combinations therof.
Claim 2
Dependent Claim
133 words
An aqueous contact lens cleaning solution, comprising an effective amount of an anionic surfactant formula: R-O-(CH.sub.2 -CH.sub.2 -O).sub.z -CH.sub.2 -COOH in which R is a C 8 to C 18 hydrocarbon chain and z is a whole number from 1 to 25; an effective amount of a calcium chelating agent selected from the group consisting of citric acid, ethylenediaminetetraacetic acid and combinations thereof; and a source of hydrated protons to facilitate removal of protein deposits from contact lenses, said source of hydrated protons comprising an acid capable of providing free hydrogen ions when in solution at acid pH in an amount sufficient to render the aqueous contact lens cleaning solution slightly acidic, said acid being selected from the group consisting of citric acid, ethylenediaminetetraacetic acid, sodium dihydrogen phosphate, gluconic acid and combinations therof.
Claim 3
Dependent Claim
37 words
The aqueous contact lens cleaning solution of claim 1, wherein the solution comprises from about 0.02 to 1.0 weight/volume percent of the anionic surfactant and from about 0.005 to 0.5 weight/volume percent of the calcium chelating agent.
Claim 4
Dependent Claim
21 words
The aqueous contact lens cleaning solution of claim 1, wherein R is a C 12 hydrocarbon chain and z is 10.
Claim 5
Dependent Claim
17 words
The aqueous contact lens cleaning solution of claim 1, wherein the calcium chelating agent comprises ethylenediaminetetraacetic acid.
Claim 6
Dependent Claim
21 words
A method of cleaning a contact lens which comprises applying the contact lens cleaning solution of claim 1 to the lens.
References Cited (Backward Citations)
US2183153A
Cited
US3240709A
Cited
US3171752A
Cited
US3183152A
Cited
US3311577A
Cited
US3539520A
Cited
US3549747A
Cited
US3882036A
Cited
US3954644A
Cited
US3639576A
Cited
US3947573A
Cited
US3767788A
Cited
US3856919A
Cited
US3755561A
Cited
US3910296A
Cited
US3910296B1
Cited
US4046706A
Cited
US4152283A
Cited
US4311618A
Cited
US4096870A
Cited
US4127423A
Cited
US4285738A
Cited
US4395346A
Cited
US4356100A
Cited
US4421665A
Cited
US4407791A
Cited
US4440662A
Cited
US4410442A
Cited
DE3320340A1
Cited
EP0102118A2
Cited
US4546123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |