US4388436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permeable contact lens
Assignee: Hydron Ltd
•
Filing: 1981-06-08
•
Granted: 1983-06-14
•
Expires: 2001-06-08
Abstract
Abstract A hydrophilic soft contact lens is made from a cross-linked copolymer of an N,N-(C1-C2alkyl)acrylamide and cyclohexyl methacrylate. The lens has much higher oxygen permeability and better mechanical properties than conventional hydrophilic contact lenses.
Inventors
- 👤 Richard Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:10
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
20 words
A cross-linked copolymer of N,N-(C 1 -C 2 alkyl)acrylamide and cyclohexyl methacrylate having a molar ratio of 3.5 to 5.5:1.
Claim 2
Dependent Claim
20 words
A cross-linked copolymer of N,N-(C 1 -C 2 alkyl)acrylamide and cyclohexyl methacrylate having a molar ratio of 3.5 to 5.5:1.
Claim 3
Dependent Claim
15 words
A copolymer according to claim 1 having a molar ratio of about 4.0 to 5:1.
Claim 4
Dependent Claim
12 words
A copolymer according to claim 2 having a molar ratio of 4.5:1.
Claim 5
Dependent Claim
11 words
A copolymer according to claim 2 wherein the acrylamide is N,N-dimethylacrylamide.
Claim 6
Dependent Claim
11 words
A copolymer according to claim 3 wherein the acrylamide is N,N-dimethylacrylamide.
Claim 7
Dependent Claim
20 words
A copolymer according to claim 1 including 0.02 to 5 weight % of the total monomers of a cross-linking monomer.
Claim 8
Dependent Claim
19 words
A copolymer according to claim 6 wherein the cross-linking agent is a multiester of acrylic acid or methacrylic acid.
Claim 9
Dependent Claim
41 words
A copolymer according to claim 7 wherein the molar ratio of the N,N-(C 1 -C 2 alkyl)acrylamide to cyclohexyl methacrylate is about 4.0 to 5:1 and wherein the copolymer includes from about 0.1 to 2.0 weight % of the crosslinking agent.
Claim 10
Dependent Claim
28 words
A copolymer according to claim 8 of N,N-dimethylacrylamide to cyclohexyl methacrylate of 4.5:1 and a weight percent of tetraethylene glycol dimethacrylate of 1.5 based on the total monomers.
Claim 11
Dependent Claim
28 words
A water-swellable, water-insoluble hydrophilic contact lens formed from a cross-linked copolymer of N,N-(C 1 -C 2 alkyl)acrylamide and cyclohexyl methacrylate having a molar ratio of 3.5 to 5.5:1.
Claim 12
Dependent Claim
28 words
A water-swellable, water-insoluble hydrophilic contact lens formed from a cross-linked copolymer of N,N-(C 1 -C 2 alkyl)acrylamide and cyclohexyl methacrylate having a molar ratio of 3.5 to 5.5:1.
Claim 13
Dependent Claim
20 words
A contact lens according to claim 10 made from a copolymer having a molar ratio of about 4.0 to 5:1.
Claim 14
Dependent Claim
16 words
A contact lens according to claim 11 made from a copolymer having molar ratio of 4.5:1.
Claim 15
Dependent Claim
12 words
A contact lens according to claim 12 wherein the acrylamide is N,N-dimethylacrylamide.
Claim 16
Dependent Claim
12 words
A contact lens according to claim 11 wherein the acrylamide is N,N-dimethylacrylamide.
Claim 17
Dependent Claim
24 words
A contact lens according to claim 10 from a copolymer including 0.02 to 5 weight % of the total monomers of a cross-linking monomer.
Claim 18
Dependent Claim
20 words
A contact lens according to claim 15 wherein the cross-linking agent is a multiester of acrylic acid or methacrylic acid.
Claim 19
Dependent Claim
28 words
A contact lens according to claim 16 wherein the acrylamide is N,N-dimethylacrylamide and wherein the copolymer includes from about 0.1 to 2.0 weight % of the cross-linking agent.
Claim 20
Dependent Claim
18 words
A contact lens according to claim 17 wherein the cross-linking agent is a polyalkylene glycol diacrylate or dimethacrylate.
Claim 21
Dependent Claim
35 words
A contact lens according to claim 18 wherein the copolymer is a copolymer of N,N-dimethylacrylamide to cyclohexyl methacrylate of 4.5:1 and a weight percent of tetraethylene glycol dimethacrylate of 1.5 based on the total monomers.
Claim 22
Dependent Claim
21 words
A contact lens according to claim 19 wherein the copolymer is prepared by polymerization with about 1 megarad of gamma irradiation.
Claim 23
Dependent Claim
35 words
A contact lens according to claim 19 having an oxygen permeability of about 38.2×10 -10 cm 3 -cm/sec-cm 2 -cmHg and when equilibrated with 0.9% sodium chloride solution having a water content of about 69%.
Claim 24
Dependent Claim
15 words
A contact lens according to claim 21 having an initial tear strength of 2.7 g/mm.
Claim 25
Dependent Claim
47 words
A contact lens according to claim 13 made from a copolymer of N,N-dimethylacrylamide, cyclohexyl methacrylate, and from about 0.1 to 2.0 weight % of a polyethylene glycol diacrylate or dimethacrylate, said lens having an oxygen permeability of about 32 to 40×10 -10 cm 3 -cm/sec-cm 2 -cmHg.
Claim 26
Dependent Claim
24 words
A contact lens according to claim 23 which when equilibrated with 0.9% sodium chloride solution has a water content of about 60 to 75%.
Claim 27
Dependent Claim
15 words
A contact lens according to claim 24 wherein the cross-linking agent is tetraethylene glycol dimethacrylate.
Claim 28
Dependent Claim
13 words
A contact lens according to claim 24 containing about 60 to 75% water.
References Cited (Backward Citations)
US3983083A
Cited
US4107418A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |