US4625007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone-containing contact lens material and contact lenses made thereof
Assignee: B&L International Holdings Corp
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Filing: 1985-01-18
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Granted: 1986-11-25
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Expires: 2005-01-18
Abstract
Abstract Multifunctional organopolysiloxane resin systems are provided whose starting materials comprise a reactive vinyl containing silane, a disubstituted silane and a trisubstituted silane hydrolyzed together to form a resin system. The preferred material of the resin system has a viscosity of from 7 to 70 centistokes at 25° C. The preferred material is in the form of a contact lens and also contains an ester and a hydrophilic agent.
Inventors
- 👤 Edward J. Ellis
- 👤 Jeanne Y. Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:29
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/20; C08F; C08F283/00; C08F283/12; C08F283/124; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A contact lens consisting essentially of polymerized material formed from (A) 25 to 98% by weight of the resin system having the following formula: ##STR19## a=0.10 to 0.40 mole fraction b=0.25 to 0.80 mole fraction c=0.10 to 0.40 mole fraction, (B) 75 to 2% by weight of an ester of a C 1 -C 20 monohydric or polyhydric alkanol or phenol and an acid selected fom the class consisting essentially of acrylic, methacrylic, itaconic acid and mixtures thereof, and (C) 1 to 10% of a hydrophilic agent, which material is polymerized to a degree above 95% completion by free radical polymerization.
Claim 2
Dependent Claim
101 words
A contact lens consisting essentially of polymerized material formed from (A) 25 to 98% by weight of the resin system having the following formula: ##STR19## a=0.10 to 0.40 mole fraction b=0.25 to 0.80 mole fraction c=0.10 to 0.40 mole fraction, (B) 75 to 2% by weight of an ester of a C 1 -C 20 monohydric or polyhydric alkanol or phenol and an acid selected fom the class consisting essentially of acrylic, methacrylic, itaconic acid and mixtures thereof, and (C) 1 to 10% of a hydrophilic agent, which material is polymerized to a degree above 95% completion by free radical polymerization.
Claim 3
Dependent Claim
53 words
A contact lens in accordance with claim 1 wherein (A) is in the range of from 30 to 60% by weight, a=0.20 to 0.35 mole fraction b=0.40 to 0.60 mole fraction c=0.20 to 0.40 mole fraction (B) is 69 to 40% by weight and is methylmethacrylate (C) is 1 to 10% by weight
Claim 4
Dependent Claim
12 words
A contact lens in accordance with claim 1 wherein C is vinylpyrrolidone.
Claim 5
Dependent Claim
13 words
A contact lens in accordance with claim 1 wherein C is acrylic acid.
Claim 6
Dependent Claim
13 words
A contact lens in accordance with claim 1 wherein C is methacrylic acid.
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) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |