US4734475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wettable surface modified contact lens fabricated from an oxirane containing hydrophobic polymer
Assignee: Ciba Vision Corp
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Filing: 1986-12-15
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Granted: 1988-03-29
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Expires: 2006-12-15
Abstract
Abstract A contact lens possessing a wettable surface in its aqueous environment of use fabricated from a hydrophobic addition polymer incorporating between about 0.5 and about 30% weight oxirane substituted units in the backbone thereof, wherein the outer surfaces of said lens contain an effective hydrophilic inducing amount of a reaction product of said oxirane substituted units of the formula ##STR1## wherein R is hydrogen or methyl; R 1 is ##STR2## or lower alkylene; n is 1 to 4; and R 0 is hydrogen or ##STR3## with a water soluble reactive organic amine, alcohol, thiol, urea or thiourea or a sulfite, bisulfite or thiosulfate, and the use thereof by placement in the eye of a patient in need of the same to correct vision defects of a refractive nature.
Inventors
- 👤 Merrill Goldenberg
- 👤 Karl F. Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:30
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
A contact lens possessing a wettable surface in its aqueous environment of use fabricated from a hydrophobic addition polymer incorporating between about 0.5 and about 30 percent by weight oxirane substituted units in the backbone thereof, wherein the outer surfaces of said lens contain an amount sufficient to increase the contact angle by at least 5°, of a reaction product of said oxirane substituted units of the formula: ##STR12## wherein R is hydrogen or methyl; R 1 is ##STR13## or lower alkylene; n is 1 to 4; and R o is hydrogen or ##STR14## with a water soluble amine, alcohol, thiol, urea or thiourea, or a sulfite, bisulfite or thiosulfate.
Claim 2
Dependent Claim
110 words
A contact lens possessing a wettable surface in its aqueous environment of use fabricated from a hydrophobic addition polymer incorporating between about 0.5 and about 30 percent by weight oxirane substituted units in the backbone thereof, wherein the outer surfaces of said lens contain an amount sufficient to increase the contact angle by at least 5°, of a reaction product of said oxirane substituted units of the formula: ##STR12## wherein R is hydrogen or methyl; R 1 is ##STR13## or lower alkylene; n is 1 to 4; and R o is hydrogen or ##STR14## with a water soluble amine, alcohol, thiol, urea or thiourea, or a sulfite, bisulfite or thiosulfate.
Claim 3
Dependent Claim
17 words
A contact lens according to claim 1, wherein the contact angle is increased by at least 10°.
Claim 4
Dependent Claim
17 words
A contact lens according to claim 2, wherein the contact angle is increased by at least 15°.
Claim 5
Dependent Claim
36 words
A contact lens according to claim 1, wherein the reaction product is a reaction product between said oxirane and a water soluble aliphatic, cycloaliphatic or aromatic primary or secondary amine having up to 12 carbon atoms.
Claim 6
Dependent Claim
31 words
A contact lens according to claim 1, wherein the reaction product is a reaction product between said oxirane and a water soluble pharmaceutically acceptable salt of a sulfite, bisulfite or thiosulfate.
Claim 7
Dependent Claim
19 words
A contact lens according to claim 1, wherein the hydrophobic polymer has a contact angle less than about 150°.
Claim 8
Dependent Claim
15 words
A contact lens according to claim 6, wherein said contact angle is less than 145°.
Claim 9
Dependent Claim
17 words
A contact lens according to claim 1, wherein the contact lens material is a silicone containing copolymer.
Claim 10
Dependent Claim
63 words
A contact lens according to claim 1 wherein the reaction product is prepared by conducting the reaction in aqueous medium at a PH between 3 and 10 and a temperature between 0 and 100° C. for a period of time sufficient such that the surface region of the lens, up to 10 percent of the thickness thereof is reacted to form reaction product.
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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) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |