USRE29693E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of soaking and sterilizing hydrophilic soft contact lens with chlorhexidine
Assignee: Barnes Hind Pharmaceuticals Inc
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Filing: 1975-11-06
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Granted: 1978-07-04
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Expires: 1995-11-06
Abstract
Abstract Chlorhexidene solutions are employed to sterilize and soak both hard and soft contact lenses.
Inventors
- 👤 Russell E. Phares, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:55
CPC Classifications
A; A61; A61L; A61L12/00; A61L12/08; A61L12/14; A61L12/141
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
38 words
The process of soaking and sterilizing hydrophilic soft contact lenses comprising placing a lens in an aqueous solution containing from about .Badd..[.0.001.]. .Baddend..Iadd.0.004 .Iaddend.percent to .Badd..[.0.1.]. .Baddend..Iadd.0.01 .Iaddend.percent of chlorhexidene for a time sufficient to sterilize said lens.
Claim 2
Dependent Claim
38 words
The process of soaking and sterilizing hydrophilic soft contact lenses comprising placing a lens in an aqueous solution containing from about .Badd..[.0.001.]. .Baddend..Iadd.0.004 .Iaddend.percent to .Badd..[.0.1.]. .Baddend..Iadd.0.01 .Iaddend.percent of chlorhexidene for a time sufficient to sterilize said lens.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the chlorhexidene is, employed as a salt selected from the group consisting of digluconate, diacetate and dihydrochloride.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the aqueous solution is an isotonic solution containing an isotonic agent.
Claim 5
Dependent Claim
29 words
The process of claim 3 wherein the isotomic agent is selected from the group consisting of sodium chloride, sodium citrate, boric acid, sodium nitrate, propylene glycol, glycerine and mannitol.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein The aqueous solution has a pH of 4.5 to 8.5.
Claim 7
Dependent Claim
59 words
The process of claim 5 wherein the pH is about 7.4. .Iadd. 7. The process according to claim 1 wherein said hydrophilic soft contact lenses are consisting essentially of polyhydroxyethyl methacrylate cross-linked with hydroxyethyl dimethacrylate..Iaddend..Iadd. 8. A process according to claim 2, wherein said hydrophilic soft contact lenses are consisting essentially of polyhydroxyethyl methacrylate cross-linked with hydroxyethyl dimethacrylate. .Iaddend.
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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |