US4411932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the prevention of soilant deposits on contact lenses
Assignee: Alcon Research LLC
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Filing: 1981-11-23
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Granted: 1983-10-25
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Expires: 2001-11-23
Abstract
Abstract This invention relates to polymeric alcohols and polymeric ethers including poly(ethylene glycol), polyethylene oxide and polyethylene glycol methyl ether as prophylactic agents against soilant deposits on contact lenses.
Inventors
- 👤 Stephen C. Kwan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:12
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J2471/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
A method for preventing soil encrustation on a soft contact lens comprising exposing the soft contact lens to an aqueous solution which comprises a composition selected from the group consisting of poly(ethylene glycol) having a molecular weight in the range from about 500 to about 15,000, alkyl ethers of polyethylene glycol having a molecular weight in the range from about 550 to about 5,000, polyethylene oxide having a molecular weight in the range from about 100,000 to about 5,000,000, and mixtures thereof.
Claim 2
Independent Claim
82 words
A method for preventing soil encrustation on a soft contact lens comprising exposing the soft contact lens to an aqueous solution which comprises a composition selected from the group consisting of poly(ethylene glycol) having a molecular weight in the range from about 500 to about 15,000, alkyl ethers of polyethylene glycol having a molecular weight in the range from about 550 to about 5,000, polyethylene oxide having a molecular weight in the range from about 100,000 to about 5,000,000, and mixtures thereof.
Claim 3
Dependent Claim
42 words
A method as recited in claim 1 wherein said poly(ethylene glycol) has a molecular weight in the range of from about 3,350 to about 15,000 and said polyethylene oxide has a molecular weight in the range from about 100,000 to about 600,000.
Claim 4
Dependent Claim
20 words
A method as recited in claim 1 wherein exposing said soft contact lens includes heating said lens in said solution.
Claim 5
Independent Claim
32 words
A method as recited in claims 1, 2, or 3 wherein said solution has a concentration of said composition in the range of from about 0.1 to about 5.0 percent by weight/volume.
Claim 6
Dependent Claim
49 words
A method as recited in claim 3 wherein said composition is poly(ethylene glycol) having a molecular weight in the range from about 500 to about 15,000, and said polyethylene glycol has a concentration in said solution in the range from about 0.1 percent to about 5.0 percent by weight/volume.
Claim 7
Dependent Claim
51 words
A method as recited in claim 3 wherein said composition is polyethylene glycol methyl ether having a molecular weight in the range from about 550 to about 5,000, and said polyethylene glycol methyl ether has a concentration in said solution in the range from about 0.05% to about 5 percent weight/volume.
Claim 8
Dependent Claim
23 words
A method as recited in claim 3 wherein said heating is in the range of from about 85° C. to about 95° C.
References Cited (Backward Citations)
US4143949A
Cited
US4168112A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |