Patent US3311577A successfully refreshed from Google Patents.
US3311577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater contact lens solution
Assignee: Alcon Vision LLC
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Filing: 1965-03-29
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Granted: 1967-03-28
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Expires: 1985-03-29
Abstract
No abstract record available.
Inventors
- 👤 Billy F Rankin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:18
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/0012; A61K9/0048
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
AN EYE COMPATIBLE COMPOSITION SUITABLE FOR USE WITH CONTACT LENSES CONSISTING ESSENTIALLY OF A WATER BASE CONTAINING A CELLULOSIC DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF METHYL CELLULOSE, CARBOXY METHYL CELLULOSE, PROPYL METHYL CELLULOSE, HYDROXY ETHYL CELLUSLOSE, AND HYDROXY PROPYL CELLULOSE; FROM .25 TO 4% UNSUBSTITUTED POLYALKYLENE GLYCOL; A COMBINATION OF ALKALI METAL MONO AND DIBASIC BUFFERS TO PROVIDE A PH OF FROM ABOUT 7.4 AND 8.2 AND A VISCOSITY OF BETWEEN ABOUT 3000 AND 30,000 CPS. WHEN MEASURED BY A BROOKFIELD VISCOSIMETER AT 20*C. WITH #6 SPINDLE AT 10 R.P.M.
References Cited (Backward Citations)
US3171752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-27 | 1970-09-26 | 1971-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-27 | 1974-09-26 | 1975-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-27 | 1978-09-26 | 1979-03-28 | $7700.00 | Window Closed / Lapsed |