Patent US4721377A successfully refreshed from Google Patents.
US4721377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly-refractive plastic lens
Assignee: Toray Industries Inc
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Filing: 1987-02-25
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Granted: 1988-01-26
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Expires: 2007-02-25
Abstract
Abstract A plastic lens formed from a copolymer of three components. A first component which is a vinyl monomer having a nucleus-halogen-substituted aromatic ring. A second component which is selected from at least one member of the group consisting of aliphatic diacrylate, dimethacrylate, triacrylate, and trimethacrylate. A third component is chosen from mono-acrylate or mono-methacrylate having a nucleus-halogen substituted aromatic ring. The components are present in the weight ratio of 20/15/0 to 85/80/60 weight percent, respectively.
Inventors
- 👤 Tadanori Fukuda
- 👤 Sadayuki Sakamoto
- 👤 Masami Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:50
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
A plastic lens which comprises a copolymer of (A) 20 to 85 percent by weight of dibromostyrene with (B) 15 to 80 percent by weight of at least one member selected from the group consisting of aliphatic diacrylate, dimethacrylate, triacrylate and trimethacrylate, and (C) less than 60 percent by weight of mono-acrylate, or monomethacrylate having a nucleus-halogen substituted aromatic ring, said copolymer being in the form of a lens.
Claim 2
Dependent Claim
69 words
A plastic lens which comprises a copolymer of (A) 20 to 85 percent by weight of dibromostyrene with (B) 15 to 80 percent by weight of at least one member selected from the group consisting of aliphatic diacrylate, dimethacrylate, triacrylate and trimethacrylate, and (C) less than 60 percent by weight of mono-acrylate, or monomethacrylate having a nucleus-halogen substituted aromatic ring, said copolymer being in the form of a lens.
Claim 3
Dependent Claim
60 words
A plastic lens according to claim 1, wherein the component C is at least one member selected from the group represented by the following general formulae V and VI ##STR7## wherein X is chlorine, bromine or iodine, R 5 is a methyl group or hydrogen, W is one of ##STR8## and r is an integer of from 1 to 5.
Claim 4
Dependent Claim
14 words
A plastic lens according to claim 1, wherein the polymer is formed by cast-polymerization.
Claim 5
Dependent Claim
14 words
A plastic lens according to claim 1, wherein component B is ethylene glycol dimethacrylate.
Claim 6
Dependent Claim
59 words
A plastic lens according to claim 1, wherein component B is aliphatic diacrylate and/or dimethacrylate represented by the following general formulae II. ##STR9## wherein R 1 is a methyl group hydrogen, Y is one being selected out of groups ##STR10## whereby b is an integer of from 3 to 10, l is an integer of from 1 to 10.
Claim 7
Dependent Claim
65 words
A plastic lens according to claim 1, wherein component C is a monomer represented by the following general formulae VI ##STR11## wherein X is chlorine, bromine, or iodine, R 5 is a methyl group or hydrogen, W is one being selected out of groups ##STR12## and r is an integer of from 1 to 5, and S in an integer of from 1 to 4.
Claim 8
Dependent Claim
14 words
A plastic lens according to claim 1, wherein component B is ethylene glycol dimethacrylate.
Claim 9
Dependent Claim
13 words
A plastic lens according to claim 1, wherein component C is 2,3,4,5,6-pentabromophenoxyethyl acrylate.
References Cited (Backward Citations)
US4243790A
Cited
GB2034721A
Cited
US4306780A
Cited
JPS5814449A
Cited
JPS6012501A
Cited
JPS6014202A
Cited
US4487904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |