US4163608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydratable gas permeable methyl methacrylate copolymer
Assignee: Sunsoft Corp
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Filing: 1977-10-05
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Granted: 1979-08-07
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Expires: 1997-10-05
Abstract
Abstract A gas permeable contact lens material made by copolymerizing methyl methacrylate, N-(1,1-dimethyl-3-oxobutyl) acrylamide and methacrylic acid to form a hard solid contact lens material which may be made soft and hydrophilic by placing the lens in an alkaline solution.
Inventors
- 👤 Charles W. Neefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:37
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/14; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
75 words
A contact lens concave-convex form in section and of a curvature substantially the same as the eye to which it is applied, made of a hydrated oxygen permeable copolymer, providing an oxygen equivalent of 6.71% at a lens thickness of 0.15 millimeters said copolymer consisting of 100 parts by weight methyl methacrylate monomer copolymerized with from 1 to 50 parts by weight of N-(1,1-dimethyl-3-oxobutyl) acrylamide monomer and 2 to 30 parts by weight methacrylic acid.
Claim 2
Dependent Claim
75 words
A contact lens concave-convex form in section and of a curvature substantially the same as the eye to which it is applied, made of a hydrated oxygen permeable copolymer, providing an oxygen equivalent of 6.71% at a lens thickness of 0.15 millimeters said copolymer consisting of 100 parts by weight methyl methacrylate monomer copolymerized with from 1 to 50 parts by weight of N-(1,1-dimethyl-3-oxobutyl) acrylamide monomer and 2 to 30 parts by weight methacrylic acid.
Claim 3
Dependent Claim
11 words
A contact lens of claim 1 hydrated in an alkaline solution.
Claim 4
Dependent Claim
18 words
A contact lens of claim 1 having from 0.01 parts to 5 parts by weight a crosslinking agent.
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) | 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 |