Patent US3984485A successfully refreshed from Google Patents.
US3984485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wettable polymeric materials prepared from 2-50% by wt. N-(1,1-dimethyl-3-oxobutyl)acrylamide, 2.5% by wt. crosslinking agent and methyl methacrylate
Assignee: Sunsoft Corp
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Filing: 1975-06-06
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Granted: 1976-10-05
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Expires: 1995-06-06
Abstract
Abstract A copolymer of polymethyl methacrylate and N-(1,1-dimethyl-3-oxobutyl) acrylamide having a wettable surface and low water absorption and low gas transmission.
Inventors
- 👤 Charles W. Neefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:46
CPC Classifications
C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; A; A61; A61F; A61F9/00; A61F9/0008; A61F9/0017; A61M; A61M31/00; A61M31/002
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
45 words
A material for the manufacture of contact lenses having a water absorption of 2.5% by weight and a water contact angle of less than 20° when hydrated comprising 2.5% by weight ethylene dimethacrylate, 5% by weight N-(1,1 dimethyl-3-oxobutyl) acrylamide, and 92.5% by weight methyl methacrylate.
Claim 2
Dependent Claim
45 words
A material for the manufacture of contact lenses having a water absorption of 2.5% by weight and a water contact angle of less than 20° when hydrated comprising 2.5% by weight ethylene dimethacrylate, 5% by weight N-(1,1 dimethyl-3-oxobutyl) acrylamide, and 92.5% by weight methyl methacrylate.
Claim 3
Dependent Claim
24 words
A material as in claim 1 comprising 2.5% by weight allyl methacrylate, 5% by weight N-(1,1 dimethyl-3-oxobutyl) acrylamide, and 92.5% by weight methyl methacrylate.
Claim 4
Dependent Claim
55 words
A material for the manufacture of contact lenses having a water absorption of 2.5% by weight and a water contact angle of less than 20° when hydrated comprising 2.5% by weight of a crosslinking agent selected from ethylene dimethacrylate or allyl methacrylate, 2% to 50% by weight N-(1,1 dimethyl-3-oxobutyl) acrylamide and the remainder methyl methacrylate.
Claim 5
Dependent Claim
55 words
A material for the manufacture of contact lenses having a water absorption of 2.5% by weight and a water contact angle of less than 20° when hydrated comprising 2.5% by weight of a crosslinking agent selected from ethylene dimethacrylate or allyl methacrylate, 2% to 50% by weight N-(1,1 dimethyl-3-oxobutyl) acrylamide and the remainder methyl methacrylate.
References Cited (Backward Citations)
US3660545A
Cited
US3699089A
Cited
US3277056A
Cited
US3497467A
Cited
US3425942A
Cited
US3663490A
Cited
US3518326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |