Patent US4096870A successfully refreshed from Google Patents.
US4096870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for cleaning soft hydrophilic gel contact lenses
Assignee: Alcon Vision LLC
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Filing: 1977-06-09
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Granted: 1978-06-27
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Expires: 1997-06-09
Abstract
Abstract Proteinaceous material on the surfaces of hydrophilic gel contact lenses is removed by contacting the lenses with an aqueous suspension of pancreatin without absorption of pancreatin into the lens structure. Pancreatin is formulated as tablets using sodium chloride and boric acid as binding agents thus providing a convenient, measured amount of pancreatin for cleaning a single pair of contact lenses.
Inventors
- 👤 John A. Manfuso, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:07
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/38; C11D3/386; C11D3/38609; C11D3/0005; C11D3/0078
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
20 words
A composition in tablet form consisting essentially of 25-50 mg pancreatin 4X, 60-145mg sodium chloride and 12-25 mg. boric acid.
Claim 2
Dependent Claim
20 words
A composition in tablet form consisting essentially of 25-50 mg pancreatin 4X, 60-145mg sodium chloride and 12-25 mg. boric acid.
Claim 3
Dependent Claim
25 words
The composition of claim 1 containing 35 to 40 mg pancreatin 4X, 100 to 115 mg sodium chloride and 18 to 22 mg boric acid.
Claim 4
Independent Claim
76 words
A method for removing proteinaceous deposits from hydrophilic polymer gel contact lenses comprising: dispersing an effective cleaning amount of an eye-compatible enzyme formulation in water to form a slurry, said formulation being in the form of a tablet consisting essentially of pancreatin 4X, sodium chloride and boric acid; contacting said lenses with said slurry for at least 10 minutes to remove said proteinaceous deposits; and rinsing the cleaned lenses to remove pancreatin from the lens surfaces.
Claim 5
Independent Claim
76 words
A method for removing proteinaceous deposits from hydrophilic polymer gel contact lenses comprising: dispersing an effective cleaning amount of an eye-compatible enzyme formulation in water to form a slurry, said formulation being in the form of a tablet consisting essentially of pancreatin 4X, sodium chloride and boric acid; contacting said lenses with said slurry for at least 10 minutes to remove said proteinaceous deposits; and rinsing the cleaned lenses to remove pancreatin from the lens surfaces.
Claim 6
Dependent Claim
40 words
The method of claim 3 wherein said tablet contains 25 to 50 mg pancreatin 4X, 60 to 145 mg sodium chloride and 12 to 25 mg boric acid, and wherein the tablet is dispersed in 5 to 15 ml water.
Claim 7
Dependent Claim
28 words
The method of claim 3 wherein said tablet contains 35 to 40 mg pancreatin 4X, 100 to 115 mg sodium chloride and 18 to 22 mg boric acid.
Claim 8
Dependent Claim
15 words
The method of claim 4 wherein said tablet is slurried in approximately 10 ml water.
Claim 9
Dependent Claim
16 words
The method of claim 3 wherein said lenses are rinsed with a buffered isotonic saline solution.
References Cited (Backward Citations)
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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) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |