US4163609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self cleaning contact lens
Assignee: Sunsoft Corp
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Filing: 1978-10-10
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Granted: 1979-08-07
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Expires: 1998-10-10
Abstract
Abstract A contact lens material, the surface of which is self cleaning of organic debris, by changing the surface charge from a natural anionic positive charge which attract debris to a cationic negative charge which repels debris..
Inventors
- 👤 Charles W. Neefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:50
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/049; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; G02C13/00; G02C13/008
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
A contact lens of concave-convex form in section, composed of a polymeric material having a negative electrical charge present on a hydrophilic surface and the lens surface having an affinity for water, whereby the lens material, while in the eye remains wetted by the liquid tears present on the surface of the eye and the hydrophilic surface of the lens material resists the accumulation of and repels from the lens surface the natural hydrophobic oil and protein particles present in the natural tear fluid present on the surface of the eye.
Claim 2
Dependent Claim
91 words
A contact lens of concave-convex form in section, composed of a polymeric material having a negative electrical charge present on a hydrophilic surface and the lens surface having an affinity for water, whereby the lens material, while in the eye remains wetted by the liquid tears present on the surface of the eye and the hydrophilic surface of the lens material resists the accumulation of and repels from the lens surface the natural hydrophobic oil and protein particles present in the natural tear fluid present on the surface of the eye.
Claim 3
Dependent Claim
19 words
A contact lens as in claim 1 wherein the polymeric lens material contains a sulfonate group on the surface.
Claim 4
Dependent Claim
27 words
A contact lens as in claim 1 wherein the hydrophilic lens surface resist the hydrophobic bonding of the hydrophobic oil and protein present in the natural tears.
Claim 5
Dependent Claim
17 words
A contact lens as in claim 1 wherein the contact lens is a hydrophilic soft contact lens.
Claim 6
Dependent Claim
16 words
A contact lens as in claim 1 wherein the contact lens is a hard contact lens.
References Cited (Backward Citations)
US3963662A
Cited
US4097657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-06 | 1983-02-05 | 1983-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-06 | 1987-02-05 | 1987-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-06 | 1991-02-05 | 1991-08-07 | $7700.00 | Window Closed / Lapsed |