US4280759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permeable wettable contact lens
Assignee: Sunsoft Corp
•
Filing: 1980-04-14
•
Granted: 1981-07-28
•
Expires: 2000-04-14
Abstract
Abstract The permeability of a silane copolymer is increased and the surface wetting properties improved if the silane is polymerized before being mixed with the comononer and before the copolymerization.
Inventors
- 👤 Charles W. Neefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:32
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
78 words
An oxygen permeable contact lens, having a wettable surface concave-convex in form of an optically clear permeable copolymer, made by the steps of adding 100 parts by volume monomeric methylmethacrylate to 2 to 150 parts by volume of a syrup composed of polymerized reactive organosilane, allowing the mixture to further polymerize to form a clear solid from which a contact lens having increased oxygen permeability and improved surface wetting is made by methods well known to the art.
Claim 2
Dependent Claim
78 words
An oxygen permeable contact lens, having a wettable surface concave-convex in form of an optically clear permeable copolymer, made by the steps of adding 100 parts by volume monomeric methylmethacrylate to 2 to 150 parts by volume of a syrup composed of polymerized reactive organosilane, allowing the mixture to further polymerize to form a clear solid from which a contact lens having increased oxygen permeability and improved surface wetting is made by methods well known to the art.
Claim 3
Dependent Claim
21 words
A lens as in claim 1 wherein the reactive organosilane is a partially polymerized syrup when added to the monomeric methylmethacrylate.
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) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |