US4243790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Styrene/hydroxy alkyl acrylic acid ester copolymer for contact lenses
Assignee: MC CARRY JOHN D
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Filing: 1978-06-30
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Granted: 1981-01-06
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Expires: 1998-06-30
Abstract
Abstract A novel contact lens having improved gas permeability is disclosed which is formed from copolymerizing a mixture comprising: (a) a group 1 monomer which is a styrene or substituted styrene monomer, and (b) a group 2 monomer which is a monomer of the general formula: (i) ##STR1## wherein R is hydrogen or methyl and R' is an alkyl, or a monomer of the general formula: (ii) ##STR2## wherein n is 0 or 1, R is hydrogen or methyl, and R" is hydrogen when n is 0 and hydrogen or hydroxyl when n is 1.
Inventors
- 👤 William M. Foley, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:10
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08L; C08L33/00; C08L33/04; C08L33/14; C08F222/00; C08F222/10; C08F222/1006; C08F222/102; Y; Y10; Y10S; Y10S526/00; Y10S526/93; Y10S526/936; Y10S526/937
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
75 words
A contact lens consisting essentially of the polymerization product of from about 5% to about 93.5% of styrene monomer, from about 4% to about 94% of acrylic monomers of the general formula ##STR7## wherein n is 0 or 1, R is hydrogen or methyl, and R" is hydrogen when n is 0 and hydrogen or hydroxyl when n is 1, and an effective amount of cross-linking monomer and optionally up to about 10% methacrylic acid.
Claim 2
Dependent Claim
75 words
A contact lens consisting essentially of the polymerization product of from about 5% to about 93.5% of styrene monomer, from about 4% to about 94% of acrylic monomers of the general formula ##STR7## wherein n is 0 or 1, R is hydrogen or methyl, and R" is hydrogen when n is 0 and hydrogen or hydroxyl when n is 1, and an effective amount of cross-linking monomer and optionally up to about 10% methacrylic acid.
Claim 3
Dependent Claim
26 words
The contact lens of claim 1 wherein the styrene content is from about 20% to about 30% and the contact lens is a soft contact lens.
Claim 4
Dependent Claim
26 words
The contact lens of claim 1 wherein the styrene content is from about 40% to about 50% and the contact lens is a hard contact lens.
Claim 5
Dependent Claim
13 words
The contact lens of claim 1 wherein the acrylic monomer is hydroxyethyl methacrylate.
Claim 6
Dependent Claim
13 words
The contact lens of claim 2 wherein the acrylic monomer is hydroxyethyl methacrylate.
Claim 7
Dependent Claim
13 words
The contact lens of claim 3 wherein the acrylic monomer is hydroxyethyl methacrylate.
Claim 8
Dependent Claim
21 words
The contact lens of claim 1 wherein styrene comprises from about 80% to about 95% of the polymer of the lens.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |