US4463148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact lens and compositions
Assignee: Ciba Vision GmbH
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Filing: 1983-05-06
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Granted: 1984-07-31
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Expires: 2003-05-06
Abstract
Abstract A soft contact lens having in preferred embodiment an elliptical inside surface which has a numerical eccentricity of 0.2 to 0.5 and a zenith radium of curvature of 8.0 to 8.4 mm. It preferably consists of a copolymer comprising of 50% to 90% hydroxyethyl-methacrylate (HEMA) by weight, 2% to 20% one or more unsaturated carboxylic acids, 2% to 20% one or more base monomers, 5% to 25% aliphatic acrylate or methacrylate, and 0.1% to 1% of a dialkylene-glycol-dimethacrylate crosslinker.
Inventors
- 👤 Peter Hofer
- 👤 Ulrich Muller
- 👤 Manfred Barenz
- 👤 Horst Schafer
- 👤 Wolfgang Muller-Lierheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:02
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
92 words
A soft contact lens comprising a copolymer, consisting of 50% to 90% hydroxy-ethyl-methacrylate (HEMA) by weight, 2% to 20% of one or more unsaturated carboxylic acids selected from the group consisting of acrylic acid and methacrylic acid, 2% to 20% one or more basic monomers selected from the group consisting of acrylamide, methacrylamide, dimethylaminoethyl methacrylate, dimethylaminopropyl methacrylate, N-vinyl-pyrrolidone and N-vinyl-delta-lactam, 5% to 25% of an aliphatic ester of acrylic acid or methacrylic acid and 0.1% to 1% of at least one dialkylene-glycol-dimethacrylate cross-linker selected from the group consisting of ethylene-diethylene-dipropylene-, and triethylene-glycol-dimethyacrylate.
Claim 2
Dependent Claim
92 words
A soft contact lens comprising a copolymer, consisting of 50% to 90% hydroxy-ethyl-methacrylate (HEMA) by weight, 2% to 20% of one or more unsaturated carboxylic acids selected from the group consisting of acrylic acid and methacrylic acid, 2% to 20% one or more basic monomers selected from the group consisting of acrylamide, methacrylamide, dimethylaminoethyl methacrylate, dimethylaminopropyl methacrylate, N-vinyl-pyrrolidone and N-vinyl-delta-lactam, 5% to 25% of an aliphatic ester of acrylic acid or methacrylic acid and 0.1% to 1% of at least one dialkylene-glycol-dimethacrylate cross-linker selected from the group consisting of ethylene-diethylene-dipropylene-, and triethylene-glycol-dimethyacrylate.
Claim 3
Dependent Claim
38 words
The lens according to claim 1, wherein the unsaturated carboxylic acid is acrylic acid or methacrylic acid; the base monomer is acrylamide, methacrylamide, dimethyl-aminoethyl-methacrylate, dimethylaminopropyl methacrylate, N-vinyl pyrrolidone or N-vinyl-deltalactam; and the cross-linker is a diethlene- or dipropylene-glycol-dimethacrylate.
Claim 4
Dependent Claim
32 words
A lens as claimed in claim 1 as follows: HEMA 77.8% by weight, N-vinyl pyrrolidone 3.4% by weight, methacrylic acid 5.2% by weight, butyl-methacrylate 12.9% by weight, and triethylene-glycol-dimethacrylate 0.7% by weight.
Claim 5
Dependent Claim
33 words
A lens as claimed in claim 1 as follows: HEMA 78.35% by weight, N-vinyl pyrrolidone 3.5% by weight, methacrylic acid 5.0% by weight, butyl-methacrylate 13.0% by weight, and ethylene glycol-dimethacrylate 0.15% by weight.
Claim 6
Dependent Claim
32 words
A lens as claimed in claim 1 as follows: HEMA 74.5% by weight, N-vinyl pyrrolidone 7.05% by weight, methacrylic acid 7.05% by weight, butyl-methacrylate 11.30% by weight, and triethylene-glycol-dimethacrylate 0.10% by weight.
Claim 7
Dependent Claim
32 words
A lens as claimed in claim 1 as follows: HEMA 56% by weight, N-vinyl pyrrolidone 18.5% by weight, methacrylic acid 15.5% by weight, butyl-methacrylate 5.0% by weight, and triethylene-glycol-dimethacrylate 0.1% by weight.
References Cited (Backward Citations)
US3937680A
Cited
US4036788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |