Patent US4536267A successfully refreshed from Google Patents.
US4536267A
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Plastic lens of neopentyl glycol dimethacrylate copolymerized with methoxy diethylene glycol methacrylate or diethylene glycol dimethacrylate
Assignee: Panasonic Holdings Corp
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Filing: 1983-04-01
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Granted: 1985-08-20
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Expires: 2003-04-01
Abstract
Abstract There are provided acrylic plastic lenses having a wide range of refractive indices as well as excellent physical and optical properties by polymerization of specific acrylic monomers in the presence of a photopolymerization initiator and a thermal polymerization catalyst.
Inventors
- 👤 Akio Ito
- 👤 Shunsuke Matsuda
- 👤 Yoshinobu Murakami
- 👤 Tooru Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:11
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
48 words
A plastic lens obtained by polymerizing neopentyl glycol dimethacrylate with methoxy diethylene glycol methacrylate or diethylene glycol dimethacrylate, said polymerization being performed in the presence of a photopolymerization initiator and a polymerization catalyst which is methyl ethyl ketone peroxide, the transmittivity of said lens being at least 75%.
Claim 2
Dependent Claim
48 words
A plastic lens obtained by polymerizing neopentyl glycol dimethacrylate with methoxy diethylene glycol methacrylate or diethylene glycol dimethacrylate, said polymerization being performed in the presence of a photopolymerization initiator and a polymerization catalyst which is methyl ethyl ketone peroxide, the transmittivity of said lens being at least 75%.
Claim 3
Dependent Claim
30 words
The plastic lens according to claim 1 wherein the photopolymerization initiator is benzoin isopropyl ether, benzoin ethyl ether, benzoin isobutyl ether, α-aryl benzoin, α-methyl benzoin, benzophenone, benzyl, or 2-ethyl anthraquinone.
Claim 4
Dependent Claim
15 words
The plastic lens according to claim 2 wherein the photopolymerization initiator is benzoin isopropyl ether.
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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) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |