US4478981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixtures of polyacrylate resins and siloxane carbonate copolymers
Assignee: DRUG ROYALTY CORP Inc
•
Filing: 1982-03-22
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Granted: 1984-10-23
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Expires: 2002-03-22
Abstract
Abstract Contact lenses are fabricated from a mixture of polymethymethacrylate and polydimethylsiloxane-bisphenol A carbonate block copolymers. The lenses so produced exhibit excellent oxygen permeability.
Inventors
- 👤 Barry C. Arkles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:27
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; C08L83/00; C08L83/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
23 words
A composition comprising an oxygen-permeable, transparent alloy of a polyacrylic resin and a siloxane-carbonate copolymer comprising an organo polysiloxane-bisphenol A carbonate block copolymer.
Claim 2
Dependent Claim
23 words
A composition comprising an oxygen-permeable, transparent alloy of a polyacrylic resin and a siloxane-carbonate copolymer comprising an organo polysiloxane-bisphenol A carbonate block copolymer.
Claim 3
Dependent Claim
16 words
A composition according to claim 1 wherein said siloxane-carbonate copolymer comprises polydimethylsiloxane-bisphenol A carbonate block copolymer.
Claim 4
Dependent Claim
21 words
A composition according to claim 2 wherein said polydimethylsiloxane comprises between about 50 and about 55 weight percent of the copolymer.
Claim 5
Dependent Claim
12 words
A composition according to claim 1 wherein said polyacrylic resin is polymethylmethacrylate.
Claim 6
Dependent Claim
21 words
A composition according to claim 1 wherein said copolymer comprises between about 0.5 and about 50 weight percent of said composition.
Claim 7
Dependent Claim
21 words
A composition according to claim 1 wherein said copolymer comprises between about 2 and about 20 weight percent of said composition.
Claim 8
Dependent Claim
19 words
A method of producing the composition of claim 1, 2, 3, 4, 5 or 6 which comprises melt mixing.
Claim 9
Dependent Claim
27 words
A method of producing the composition of claim 1, 2, 3, 4, 5 or 6 which comprises polymerizing acrylate monomer in the presence of said siloxane-polycarbonate copolymer.
Claim 10
Dependent Claim
15 words
Contact lenses fabricated from the compositions of claim 1, 2, 3, 4, 5 or 6.
Claim 11
Dependent Claim
9 words
Contact lenses produced by the method of claim 7.
Claim 12
Dependent Claim
9 words
Contact lenses produced by the method of claim 8.
References Cited (Backward Citations)
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US3808178A
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Cited
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Cited
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Cited
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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) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |