US4707431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical information recording medium
Assignee: Ricoh Co Ltd
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Filing: 1985-10-25
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Granted: 1987-11-17
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Expires: 2005-10-25
Abstract
Abstract This invention relates to an optical information recording medium comprising a substrate provided at least with an underlayer and a recording layer thereon, said underlayer being prepared by curing a light-curable composition containing a reducing agent, a photo-polymerization initiator and acrylate monomer and/or methacrylate monomer and/or their corresponding oligomer.
Inventors
- 👤 Masaakira Umehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:59
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/254; G11B7/2542; G11B7/253; G11B7/2533; G11B7/242; G11B7/243; G11B7/2433; G11B7/244; G11B7/246; G11B7/247; G11B7/2472; G11B7/2475; G11B7/2534; G11B7/2535; G11B7/2536; G11B7/2538; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/114; Y10S430/118; Y10S430/119; Y10S430/146
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
85 words
An optical information recording medium comprising a substrate provided at least with an underlayer and a monolayer coloring-matter containing recording layer thereon, said underlayer being prepared by curing a light-curable composition of acrylate monomer and/or methacrylate monomer and/or their corresponding oligomer containing an effective amount to impart heat-resistance of a reducing agent selected from the group consisting of monohydroxybenzenes, polyhydroxybenzenes and alkylenebisphenols, and a photo-polymerization initiator selected from the group consisting of substituted and unsubstituted acetophenones, substituted and unsubstituted benzophenones and substituted and unsubstituted thioxanthones.
Claim 2
Dependent Claim
85 words
An optical information recording medium comprising a substrate provided at least with an underlayer and a monolayer coloring-matter containing recording layer thereon, said underlayer being prepared by curing a light-curable composition of acrylate monomer and/or methacrylate monomer and/or their corresponding oligomer containing an effective amount to impart heat-resistance of a reducing agent selected from the group consisting of monohydroxybenzenes, polyhydroxybenzenes and alkylenebisphenols, and a photo-polymerization initiator selected from the group consisting of substituted and unsubstituted acetophenones, substituted and unsubstituted benzophenones and substituted and unsubstituted thioxanthones.
Claim 3
Dependent Claim
18 words
An optical information recording medium according to claim 1, wherein the photo-polymerization initiator is an acetophenone or thioxanthone.
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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) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |