US4451629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact lens and process for preparing the same
Assignee: Menicon Co Ltd
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Filing: 1982-01-05
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Granted: 1984-05-29
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Expires: 2002-01-05
Abstract
Abstract A water-absorptive contact lens made of a copolymer comprising units of an ester of acrylic or methacrylic acid and at least one saccharide selected from D-galactose, D-glucose and D-mannose and units of at least one member selected from a hydrophilic monomer and a hydrophobic monomer, which has excellent oxygen permeability and affinity for the eye and can be worn continuously for a long period of time. The contact lens is prepared by polymerizing a monomer mixture containing an ester of acrylic or methacrylic acid with a ketalized saccharide and a hydrophilic monomer and/or a hydrophobic monomer, and after forming the resulting copolymer into a contact lens, if necessary, treating the copolymer having a shape of contact lens with an acid to convert the ketal groups into hydroxyl groups.
Inventors
- 👤 Kyoichi Tanaka
- 👤 Shinji Kanome
- 👤 Tatsutoshi Nakajima
- 👤 Kazuhiko Nakada
- 👤 Nobuyuki Toyoshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:00
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00076; C; C08; C08F; C08F8/00; C08F8/12; C08J; C08J7/00; C08J7/12; C08F220/00; C08F220/02; C08F220/10; C08F220/26; C08F220/28; C08F220/283; C08F2810/00; C08F2810/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
38 words
A water-absorptive contact lens made of a copolymer comprising acrylate or methacrylate units having saccharides as side chains and units of at least one member selected from the group consisting of a hydrophilic monomer and a hydrophobic monomer.
Claim 2
Dependent Claim
38 words
A water-absorptive contact lens made of a copolymer comprising acrylate or methacrylate units having saccharides as side chains and units of at least one member selected from the group consisting of a hydrophilic monomer and a hydrophobic monomer.
Claim 3
Dependent Claim
24 words
The contact lens of claim 1, wherein said saccharides are at least one member selected from the group consisting of D-galactose, D-glucose and D-mannose.
Claim 4
Dependent Claim
46 words
The contact lens of claim 1, wherein said hydrophilic monomer is at least one member selected from the group consisting of 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl methacrylate, 2-hydroxypropyl acrylate, polyethylene glycol monomethacrylate, polyethylene glycol monoacrylate, acrylamide, methacrylamide, dimethylacrylamide, dimethylmethacrylamide, acrylic acid, methacrylic acid and N-vinyl pyrrolidone.
Claim 5
Dependent Claim
45 words
The contact lens of claim 1, wherein said hydrophobic monomer is at least one member selected from the group consisting of alkyl esters of methacrylic acid and acrylic acid wherein the alkyl group has 1 to 15 carbon atoms, styrene, vinyl acetate and vinyl propionate.
Claim 6
Dependent Claim
84 words
A process for preparing a water-absorptive contact lens which comprises the steps of carrying out a polymerization of a monomer mixture containing an ester of acrylic or methacrylic acid with a ketalized saccharide and at least one member selected from the group consisting of a hydrophilic monomer and a hydrophobic monomer, forming the obtained copolymer into a contact lens, treating the contact lens with an acid, and replacing the acid impregnated in the resulting water-absorptive contact lens with water or a physiological saline water.
Claim 7
Dependent Claim
84 words
A process for preparing a water-absorptive contact lens which comprises the steps of carrying out a polymerization of a monomer mixture containing an ester of acrylic or methacrylic acid with a ketalized saccharide and at least one member selected from the group consisting of a hydrophilic monomer and a hydrophobic monomer, forming the obtained copolymer into a contact lens, treating the contact lens with an acid, and replacing the acid impregnated in the resulting water-absorptive contact lens with water or a physiological saline water.
Claim 8
Dependent Claim
18 words
The process of claim 5, wherein the polymerization is carried out in the presence of a wetting 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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |