Patent US4814109A successfully refreshed from Google Patents.
US4814109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cleaning contact lenses
Assignee: BIOPHAR Inc
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Filing: 1988-02-12
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Granted: 1989-03-21
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Expires: 2008-02-12
Abstract
Abstract The method of cleansing a contact lens adapted to be worn in close proximity to the cornea of the eye and typically having a light coating of mucus, lipids, or other proteinaceous materials on its outer surface, which comprises placing a drop of a mild, nonirritating surfactant composition on the lens while it is being worn to remove said coating from the outer surface thereof, said composition comprising: (a) an anionic surfactant; (b) a nonionic surfactant; and (c) an amine oxide surfactant in an amount capable of enhancing the foaming properties of the anionic and nonionic surfactants while further reducing the irritating characteristics of the anionic surfactant.
Inventors
- 👤 John R. Wittpenn, Jr.
- 👤 Richard L. Giovanoni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:22
CPC Classifications
C; C11; C11D; C11D1/00; C11D1/66; C11D1/83; C11D1/75; C11D3/00; C11D3/0005; C11D3/0078; C11D1/02; C11D1/12; C11D1/123; C11D1/74
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 words
The method of cleansing a contact lens adapted to be worn in close proximity to the cornea of the eye and typically having a light coating of mucus, lipids, or other proteinaceous materials on its outer surface, which comprises placing a drop of a mild, nonirritating surfactant composition on the lens while it is being worn to remove said coating from the outer surface thereof, said composition comprising: (a) an anionic surfactant having high foaming properties and being only mildly irritating to human tissues, said anionic surfactant being present in an amount sufficient to remove a substantial quantity of said materials; (b) a nonionic surfactant in an amount capable of reducing the irritating properties of said anionic surfactant and of emulsifying or solubilizing bodily surface physiologic debris, and in addition to said anionic and nonionic surfactants, (c) an amine oxide surfactant in an amount capable of enhancing the foaming properties of the anionic and nonionic surfactants while further reducing the irritating characteristics of the anionic surfactant.
Claim 2
Independent Claim
166 words
The method of cleansing a contact lens adapted to be worn in close proximity to the cornea of the eye and typically having a light coating of mucus, lipids, or other proteinaceous materials on its outer surface, which comprises placing a drop of a mild, nonirritating surfactant composition on the lens while it is being worn to remove said coating from the outer surface thereof, said composition comprising: (a) an anionic surfactant having high foaming properties and being only mildly irritating to human tissues, said anionic surfactant being present in an amount sufficient to remove a substantial quantity of said materials; (b) a nonionic surfactant in an amount capable of reducing the irritating properties of said anionic surfactant and of emulsifying or solubilizing bodily surface physiologic debris, and in addition to said anionic and nonionic surfactants, (c) an amine oxide surfactant in an amount capable of enhancing the foaming properties of the anionic and nonionic surfactants while further reducing the irritating characteristics of the anionic surfactant.
Claim 3
Dependent Claim
29 words
The method of cleansing a contact lens as recited in claim 1, in which the ratio of said anionic to said nonionic surfactant varies from about 1:1 to 1:4.
Claim 4
Dependent Claim
30 words
The method of cleansing a contact lens as claimed in claim 1, in which the ratio of said anionic to said amine oxide surfactant varies from about 1:0.1 to 1:4.
Claim 5
Dependent Claim
46 words
The method of cleansing a contact lens as claimed in claim 1, in which the ratio of said anionic to said nonionic surfactant varies from about 1:1 to 1:4 and the ratio of said anionic to said amine oxide surfactant varies from about 1:0.1 to 1:4.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |