Patent US3240709A successfully refreshed from Google Patents.
US3240709A
Expired / Lapsed
US
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Method of cleansing contact lenses
Assignee: Alcon Vision LLC
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Filing: 1964-08-31
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Granted: 1966-03-15
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Expires: 1984-08-31
Abstract
No abstract record available.
Inventors
- 👤 Billy F Rankin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:21
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/02; C11D7/04; C11D7/10; C11D7/16; A; A61; A61L; A61L12/00; A61L12/08; A61L12/14; A61L12/143; C11D3/00; C11D3/0005; C11D3/0078; C11D3/16; C11D3/20; C11D3/22; C11D3/222; C11D3/225
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
A METHOD OF REMOVING CRYSTALLINE TEAR DEPOSITS FROM A CONTACT LENS COMPRISING THE STEPS OF: (1) APPLYING TO THE SIDES OF THE LENS A COMPOSITION CONSISTING ESSENTIALLY OF APPROXIMATELY 1% BY WEIGHT METHYL-CELLULOSE HAVING A VISCOSITY OF ABOUT 4000 CENTIPOISES IN A WATER SOLUTION OF ABOUT 0.45 TO 0.5% SODIUM CHLORIDE BUFFERED TO A PH OF BETWEEN 6.2 AND 7.2 BY A COMBINATION OF ABOUT 0.64 TO 0.24% SODIUM BIPHOSPHATE AND ABOUT 0.188 TO 0.663% SODIUM PHOSPHATE; (2) LIGHTLY RUBBING SAID LENSES TO INSURE FULL CLENSING; AND, (3) SUBJECTING THE THUS TREATED LENS TO WATER WASHING WHEREBY ALL DEPOSITS ARE REMOVED AND A NON-IRRITATING, BLUR FREE LENS PROVIDED FOR THE HUMAN EYE.
Claim 2
Independent Claim
112 words
A METHOD OF REMOVING CRYSTALLINE TEAR DEPOSITS FROM A CONTACT LENS COMPRISING THE STEPS OF: (1) APPLYING TO THE SIDES OF THE LENS A COMPOSITION CONSISTING ESSENTIALLY OF APPROXIMATELY 1% BY WEIGHT METHYL-CELLULOSE HAVING A VISCOSITY OF ABOUT 4000 CENTIPOISES IN A WATER SOLUTION OF ABOUT 0.45 TO 0.5% SODIUM CHLORIDE BUFFERED TO A PH OF BETWEEN 6.2 AND 7.2 BY A COMBINATION OF ABOUT 0.64 TO 0.24% SODIUM BIPHOSPHATE AND ABOUT 0.188 TO 0.663% SODIUM PHOSPHATE; (2) LIGHTLY RUBBING SAID LENSES TO INSURE FULL CLENSING; AND, (3) SUBJECTING THE THUS TREATED LENS TO WATER WASHING WHEREBY ALL DEPOSITS ARE REMOVED AND A NON-IRRITATING, BLUR FREE LENS PROVIDED FOR THE HUMAN EYE.
Claim 3
Independent Claim
24 words
A METHOD ACCORDING TO CALIM 1 WHEREIN THE COMPOSITION OF STEP (1) INCLUDES FROM 0.01 TO 0.05% BENZALKONIUM CHLORIDE AS A STERILIZER AND PRESERVATIVE.
Claim 4
Independent Claim
24 words
A METHOD ACCORDING TO CALIM 1 WHEREIN THE COMPOSITION OF STEP (1) INCLUDES FROM 0.01 TO 0.05% BENZALKONIUM CHLORIDE AS A STERILIZER AND PRESERVATIVE.
References Cited (Backward Citations)
US2547653A
Cited
US3171752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |