US4528351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic lens
Assignee: Hoya Lens Corp
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Filing: 1982-07-22
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Granted: 1985-07-09
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Expires: 2002-07-22
Abstract
Abstract A plastic lens of a stepped segment having an excellent surface hardness can be obtained at high molding efficiency from cast polymerization of a diethylene glycol bisallyl carbonate and specified acrylate(s) system further added with a specified diacrylate(s) and/or dimethacrylate(s).
Inventors
- 👤 Niro Tarumi
- 👤 Yoichi Okubo
- 👤 Seiichi Yoshimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:26
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; C; C08; C08F; C08F218/00; C08F218/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
A plastic lens having a stepped segment composed of a copolymer obtained by copolymerizing diethylene glycol bisallyl carbonate, at least one monomer selected from the group A shown below and at least one monomer selected from the group B shown below, said materials being used in such proportions that diethylene glycol bisallyl carbonate will be 95-50% by weight, the group A monomer will be 5-50% by weight based on the total weight of the diethylene glycol bisallyl carbonate and Group A monomer and the group B monomer will be 0.1-25% by weight based on the total weight of said diethylene glycol bisallyl carbonate and group A monomer, Group A: methyl acrylate, ethyl acrylate, cyclohexyl acrylate, glycidyl acrylate, allyl acrylate or their methacrylate versions, Group B: diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate or their methacrylate versions.
Claim 2
Dependent Claim
138 words
A plastic lens having a stepped segment composed of a copolymer obtained by copolymerizing diethylene glycol bisallyl carbonate, at least one monomer selected from the group A shown below and at least one monomer selected from the group B shown below, said materials being used in such proportions that diethylene glycol bisallyl carbonate will be 95-50% by weight, the group A monomer will be 5-50% by weight based on the total weight of the diethylene glycol bisallyl carbonate and Group A monomer and the group B monomer will be 0.1-25% by weight based on the total weight of said diethylene glycol bisallyl carbonate and group A monomer, Group A: methyl acrylate, ethyl acrylate, cyclohexyl acrylate, glycidyl acrylate, allyl acrylate or their methacrylate versions, Group B: diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate or their methacrylate versions.
Claim 3
Dependent Claim
47 words
The plastic lens of claim 1, wherein the group A monomer is selected from the group consisting of methyl methacrylate, ethyl acrylate and cyclohexyl methacrylate, and the group B monomer is selected from the group consisting of diethylene glycol dimethacrylate, triethylene glycol dimethacrylate and tetraethylene glycol dimethacrylate.
Claim 4
Dependent Claim
79 words
The plastic lens of claim 1, wherein diethylene glycol bisallyl carbonate is used in an amount of 90 to 70% by weight, the group A monomer in an amount of 10 to 30% by weight based on the total weight of the diethylene glycol bisallyl carbonate and Group A monomer and the group B monomer in an amount of 0.5 to 15% by weight based on the total weight of said diethylene glycol bisallyl carbonate and group A monomer.
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) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |