US4028295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic polymer and contact lens
Assignee: W-J (DELAWARE) Inc
•
Filing: 1976-01-08
•
Granted: 1977-06-07
•
Expires: 1996-01-08
Abstract
Abstract A hydrophilic polymer and contact lens made therefrom, said polymer consisting essentially of a diester-free glycol monoester of acrylic or methacrylic acid and a comonomer having the formula: <IMAGE> wherein R is a C1 to C4 straight or branched chain alkoxy group, R' is a C2 to C3 straight or branched chain alkylene group, X is hydrogen or a methyl group, m is either 1 or 0, and n is an integer from 1 to 20.
Inventors
- 👤 Samuel Loshaek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:08
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/26; C08F220/28; C08F220/282
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
136 words
A contact lens consisting essentially of hydrated polymer consisting essentially of, for each 100% by weight, about 70 to 90% by weight of a hydroxy C 2 -C 4 alkyl monoester of acrylic or methacrylic acid containing less than 0.1% by weight of a diester and 10 to 30% by weight of a comonomer having the general formula: ##STR4## wherein R is a C 1 to C 4 straight or branched chain alkoxy group, R' is a C 2 to C 3 straight or branched chain alkylene group, X is hydrogen or a methyl group, m is 0, and n is 1 or 2, said polymer having a water content of about 25 to 40% by weight, a linear swelling index of about 10 to 18%, and a Shore A hardness of about 20 to 65.
Claim 2
Dependent Claim
136 words
A contact lens consisting essentially of hydrated polymer consisting essentially of, for each 100% by weight, about 70 to 90% by weight of a hydroxy C 2 -C 4 alkyl monoester of acrylic or methacrylic acid containing less than 0.1% by weight of a diester and 10 to 30% by weight of a comonomer having the general formula: ##STR4## wherein R is a C 1 to C 4 straight or branched chain alkoxy group, R' is a C 2 to C 3 straight or branched chain alkylene group, X is hydrogen or a methyl group, m is 0, and n is 1 or 2, said polymer having a water content of about 25 to 40% by weight, a linear swelling index of about 10 to 18%, and a Shore A hardness of about 20 to 65.
Claim 3
Dependent Claim
31 words
The lens of claim 1 wherein the monoester is a hydroxyethyl or hydroxypropyl acrylate or methacrylate and the comonomer is selected from alkoxyalkyl acrylates, alkoxyalkyl methacrylates, alkylcarbitol acrylates, or alkylcarbitol methacrylates.
Claim 4
Dependent Claim
18 words
The lens of claim 1 wherein the monoester is hydroxyethyl methacrylate and the comonomer is an alkoxyalkyl methacrylate.
Claim 5
Dependent Claim
11 words
The lens of claim 1 wherein the comonomer is ethoxyethyl methacrylate.
Claim 6
Dependent Claim
139 words
A corneal contact lens consisting essentially of a hydrated polymer consisting essentially of, for each 100% by weight, about 70 to 90% by weight of a hydroxy C 2 14 C 4 alkyl monoester of acrylic or methacrylic acid containing less than 0.1% by weight of a diester and 10 to 30% by weight of a comonomer having the general formula: ##STR5## wherein R is a C 1 to C 4 straight or branched chain alkoxy group, R' is a C 2 to C 3 straight or branched chain alkylene group, X is hydrogen or a methyl group, m is 0 and n is 1 or 2, said polymer having a water content of about 25 to 40% by weight, a linear swelling index of about 10 to 18%, and a Shore A hardness of about 20 to 65.
Claim 7
Dependent Claim
139 words
A corneal contact lens consisting essentially of a hydrated polymer consisting essentially of, for each 100% by weight, about 70 to 90% by weight of a hydroxy C 2 14 C 4 alkyl monoester of acrylic or methacrylic acid containing less than 0.1% by weight of a diester and 10 to 30% by weight of a comonomer having the general formula: ##STR5## wherein R is a C 1 to C 4 straight or branched chain alkoxy group, R' is a C 2 to C 3 straight or branched chain alkylene group, X is hydrogen or a methyl group, m is 0 and n is 1 or 2, said polymer having a water content of about 25 to 40% by weight, a linear swelling index of about 10 to 18%, and a Shore A hardness of about 20 to 65.
Claim 8
Dependent Claim
19 words
The contact lens of claim 5 wherein the monoester is hydroxyethyl methacrylate and the comonomer is an alkoxyalkyl methacrylate.
Claim 9
Dependent Claim
24 words
The contact lens of claim 6 wherein the polymer comprises from about 70 to 90% hydroxyethyl methacrylate and about 10 to 30% ethoxyethyl methacrylate.
Claim 10
Dependent Claim
65 words
A corneal contact lens consisting essentially of a hydrated polymer consisting essentially of 70 to 90% hydroxyethyl methacrylate containing less than 0.1% by weight of diester and about 10 to 30% ethoxyethyl methacrylate, said polymer having a water content of about 25 to 40% by weight, a linear swelling index of about 10 to 18%, and a Shore A hardness of about 20 to 65.
Claim 11
Dependent Claim
65 words
A corneal contact lens consisting essentially of a hydrated polymer consisting essentially of 70 to 90% hydroxyethyl methacrylate containing less than 0.1% by weight of diester and about 10 to 30% ethoxyethyl methacrylate, said polymer having a water content of about 25 to 40% by weight, a linear swelling index of about 10 to 18%, and a Shore A hardness of about 20 to 65.
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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |