Patent US3221428A successfully refreshed from Google Patents.
Patent US3884826A successfully refreshed from Google Patents.
US3884826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thixotropic cleaning agent for hard contact lenses
Assignee: Barnes Hind Pharmaceuticals Inc
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Filing: 1973-07-20
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Granted: 1975-05-20
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Expires: 1993-07-20
Abstract
Abstract A thixotropic gel cleaner is provided for hard contact lenses. The cleaning agent is ordinarily packaged in a tube which makes it easy to carry without danger of leakage and it is convenient and effective to use.
Inventors
- 👤 Jr Russell E Phares
- 👤 Rebecca F Nite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:04
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/48; A; A61; A61L; A61L12/00; A61L12/08; C11D17/00; C11D17/0008; C11D17/003; C11D3/0005; C11D3/0078; C11D1/00; C11D1/02; C11D1/12; C11D1/14; C11D1/146; C11D1/66; C11D1/72; C11D1/74; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
56 words
AN AQUEOUS THIXOTROPIC COMPOSITION FOR CLEANING HARD CONTACT LENSES CONSISTING ESSENTIALLY OF: FROM 0.1 TO 20 WEIGHT PERCENT OF AN ANIONIC OR NONIONIC DETERGENT; FROM 0.1 TO 5 WEIGHT PERCENT AND IN AN AMOUNT SUFFICIENT TO FORM A GEL OF A THIXOTROPIC GELLING AGENT; FROM 0.001 TO 1 WEIGHT PERCENT OF A STERILIZING AGENT, AND WATER.
Claim 2
Dependent Claim
56 words
AN AQUEOUS THIXOTROPIC COMPOSITION FOR CLEANING HARD CONTACT LENSES CONSISTING ESSENTIALLY OF: FROM 0.1 TO 20 WEIGHT PERCENT OF AN ANIONIC OR NONIONIC DETERGENT; FROM 0.1 TO 5 WEIGHT PERCENT AND IN AN AMOUNT SUFFICIENT TO FORM A GEL OF A THIXOTROPIC GELLING AGENT; FROM 0.001 TO 1 WEIGHT PERCENT OF A STERILIZING AGENT, AND WATER.
Claim 3
Dependent Claim
29 words
A composition according to claim 1, wherein said thickening agent is synthetic montmorillonite in an amount of from about 1 to 5 weight percent and said detergent is nonionic.
Claim 4
Dependent Claim
33 words
A composition according to claim 1, wherein said thickening agent is a high molecular weight carboxyvinyl polymer in an amount of from about 0.2 to 2 weight percent and said detergent is nonionic
Claim 5
Dependent Claim
12 words
A composition according to claim 3, wherein said sterilizing agent is thimerosal.
Claim 6
Dependent Claim
19 words
A composition according to claim 1, wherein said composition has a viscosity of 15,000 to 70,000 cps at 25*C.
Claim 7
Dependent Claim
50 words
A composition according to claim 1, wherein said thickening agent is carboxyvinyl polymer in the amount of from about 0.5 weight percent, said detergent is polyoxyethylene alkylaryl ether in an amount from about 0.5 weight percent, said sterilizing agent is thimerosal, and the pH of said composition is about 8.
Claim 8
Dependent Claim
36 words
A method for cleaning hard contact lenses which comprises: contacting a hard contact lens with a sufficient amount of an aqueous composition according to claim 1, to remove undesirable residue; and rinsing said hard contact lens.
Claim 9
Dependent Claim
36 words
A method of cleaning hard contact lenses which comprises: contacting a hard contact lens with a sufficient amount of an aqueous composition according to claim 6, to remove undesirable residue; and rinsing said hard contact lens.
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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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |