US4625009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-hydration contact lens
Assignee: Hoya Corp
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Filing: 1986-03-31
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Granted: 1986-11-25
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Expires: 2006-03-31
Abstract
Abstract A high-hydration contact lens having a high strength is disclosed which is made of a copolymer composed of (i) 40 to 90 wt. % of N,N-dimethyl acrylamide, (ii) 5 to 50 wt. % of a hydrophobic monomer, (iii) 0.1 to 10 wt. % of an unsaturated carboxylic acid having one ethylenically unsaturated bond, and (iv) 0.01 to 5.0 wt. % of a crosslinking agent, wherein the hydrophobic monomer is selected from the group consisting of phenyl acrylates, benzyl acrylates, phenyl methacrylates, benzyl methacrylates, alkyl acrylates, alkyl methacrylates, cyclohexyl acrylates and cyclohexyl methacrylates, and the crosslinking agent is selected from those represented by formula (I), (II), or (III) ##STR1## wherein X represents a hydrogen atom or a methyl group, a is an integer of 2 to 23, and b and c each is an integer of 2 to 14.
Inventors
- 👤 Tetsuro Izumitani
- 👤 Niro Tarumi
- 👤 Shigeo Komiya
- 👤 Takeyuki Sawamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:47
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/52; C08F220/54; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
A high-hydration contact lens with a water content of 60% or more which is made of a copolymer composed of (i) 40 to 90 wt% of N,N-dimethyl acrylamide, (ii) 5 to 50 wt% of a hydrophobic monomer, (iii) 0.1 to 10 wt% of an unsaturated carboxylic acid having one ethylenically unsaturated bond, and (iv) 0.01 to 5.0 wt% of a crosslinking agent, wherein the hydrophobic monomer is selected from the group consisting of phenyl acrylates, benzyl acrylates, phenyl methacrylates, benzyl methacrylates, alkyl acrylates, alkyl methacrylates, cyclohexyl acrylates and cyclohexyl methacrylates, and the crosslinking agent is selected from those represented by formula (I), (II), or (III) ##STR5## wherein X represents a hydrogen atom or a methyl group, a is an integer of 2 to 23, and b and c each is an integer of 2 to 14.
Claim 2
Dependent Claim
136 words
A high-hydration contact lens with a water content of 60% or more which is made of a copolymer composed of (i) 40 to 90 wt% of N,N-dimethyl acrylamide, (ii) 5 to 50 wt% of a hydrophobic monomer, (iii) 0.1 to 10 wt% of an unsaturated carboxylic acid having one ethylenically unsaturated bond, and (iv) 0.01 to 5.0 wt% of a crosslinking agent, wherein the hydrophobic monomer is selected from the group consisting of phenyl acrylates, benzyl acrylates, phenyl methacrylates, benzyl methacrylates, alkyl acrylates, alkyl methacrylates, cyclohexyl acrylates and cyclohexyl methacrylates, and the crosslinking agent is selected from those represented by formula (I), (II), or (III) ##STR5## wherein X represents a hydrogen atom or a methyl group, a is an integer of 2 to 23, and b and c each is an integer of 2 to 14.
Claim 3
Dependent Claim
26 words
A high-hydration contact lens as in claim 1, wherein the alkyl moiety in the alkyl acrylate and the alkyl methacrylates has 4 to 30 carbon atoms.
Claim 4
Dependent Claim
18 words
A high-hydration contact lens as in claim 1, wherein the hydrophobic monomer (ii) is selected from cyclohexyl methacrylates.
Claim 5
Dependent Claim
32 words
A high-hydration contact lens as in claim 1, wherein the unsaturated carboxylic acid (iii) is selected from acrylic acid, methacrylic acid, itaconic acid, crotonic acid, pyruvic acid, fumaric acid, and maleic acid.
Claim 6
Dependent Claim
37 words
A high-hydration contact lens as in claim 1, wherein the crosslinking agent (iv) is selected from those represented by formula (I), (II), or (III) wherein a, b and c each is an integer of 3 to 9.
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) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |