Patent US4261875A successfully refreshed from Google Patents.
US4261875A
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US
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Contact lenses containing hydrophilic silicone polymers
Assignee: American Optical Corp
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Filing: 1979-01-31
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Granted: 1981-04-14
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Expires: 1999-01-31
Abstract
Abstract Homopolymers and copolymers of compounds according to the formula; ##STR1## wherein R is an alkyl having 1 to 3 carbons, a+b+c+d=e, b=0 to e, c=0 to e, b+c>1, d=0 to 5, e=1 to 100, and Y is an organic group containing at least one >C=C< are hydrophilic as well as exhibiting properties similar to silicone compounds. The polymers are particularly useful in contact lenses having enhanced oxygen permeability.
Inventors
- 👤 Albert R. LeBoeuf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:30
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
50 words
A solid polymer comprising a polymerization product of a hydrophilic siloxane having the formula: ##STR21## wherein R is an alkyl having 1 to 3 carbons, a+b+c+d=e, b=0 to e, c=0 to e, b+c>1, d=0 to 5, e=1 to 100, and Y is an organic group containing at least one >C=C<.
Claim 2
Dependent Claim
50 words
A solid polymer comprising a polymerization product of a hydrophilic siloxane having the formula: ##STR21## wherein R is an alkyl having 1 to 3 carbons, a+b+c+d=e, b=0 to e, c=0 to e, b+c>1, d=0 to 5, e=1 to 100, and Y is an organic group containing at least one >C=C<.
Claim 3
Dependent Claim
38 words
A polymer comprising a free radical polymerization product of the hydrophilic siloxane of claim 1, wherein d is 1 to 5, and a monomer selected from the group consisting of 2-hydroxyethylmethacrylate, 3-methoxy-2-hydroxypropylmethacrylate, methylmethacrylate, methylacrylate, N-vinylpyrrolidone and mixtures thereof.
Claim 4
Dependent Claim
10 words
A polymer of claim 2 wherein the monomer is 2-hydroxyethylmethacrylate.
Claim 5
Dependent Claim
10 words
A polymer of claim 2 wherein the monomer is 3-methoxy-hydroxypropylmethacrylate.
Claim 6
Dependent Claim
20 words
A soft contact lens having a water content of at least 20% by weight comprising a polymer of claim 1.
Claim 7
Dependent Claim
20 words
A soft contact lens having a water content of at least 20% by weight comprising a polymer of claim 2.
Claim 8
Dependent Claim
12 words
The soft contact lens of claim 6 wherein the monomer is 2-hydroxyethylmethacrylate.
Claim 9
Dependent Claim
12 words
The soft contact lens of claim 6 wherein the monomer is 3-methoxy-2-hydroxypropylmethacrylate.
References Cited (Backward Citations)
US3655602A
Cited
US4136250A
Cited
US4153641A
Cited
US4139692A
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US4139513A
Cited
US4138382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |