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US4831608A
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Multi-layer high density information recording carrier having a non-alkali inorganic glass protective layer
Assignee: Daicel Corp
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Filing: 1987-11-06
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Granted: 1989-05-16
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Expires: 2007-11-06
Abstract
Abstract An optical information recording carrier comprising a substrate made of transparent plastic, a high density information recording layer formed on said substrate, and a thin film layer made of inorganic glass and formed between said substrate and said high density information recording layer.
Inventors
- 👤 Nagayoshi Tsukane
- 👤 Masaru Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:55
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/254; G11B7/2548; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; G11B5/00; G11B5/62; G11B5/73; G11B5/7368; G11B5/739; G11B5/73923; G11B7/2403; G11B7/257; G11B7/2578; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24306; G11B2007/25705; G11B2007/25706; G11B2007/25708; G11B2007/2571; G11B2007/25715; G11B7/253; G11B7/2533; G11B7/2534
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
84 words
An optical information recording carrier comprising: a substrate made of transparent thermoplastic resin, provided that the substrate is not made of polymethylmethacrylate; a high density information recording layer made of rare earth-transition metal amorphous alloy, deposited on a surface of said substrate; and a thin film layer having a thickness of from 100 to 2000 angstroms, made of a non-alkali inorganic glass which is a mixture of two or more inorganic oxides and formed between said substrate and said high density information recording layer.
Claim 2
Dependent Claim
84 words
An optical information recording carrier comprising: a substrate made of transparent thermoplastic resin, provided that the substrate is not made of polymethylmethacrylate; a high density information recording layer made of rare earth-transition metal amorphous alloy, deposited on a surface of said substrate; and a thin film layer having a thickness of from 100 to 2000 angstroms, made of a non-alkali inorganic glass which is a mixture of two or more inorganic oxides and formed between said substrate and said high density information recording layer.
Claim 3
Dependent Claim
42 words
The optical information recording carrier as defined in claim 1, wherein a surface protection layer made of inorganic glass is further formed on the surface of the high density information recording layer at the side opposite to the layer of inorganic glass.
Claim 4
Dependent Claim
20 words
The optical information recording carrier as defined in claim 1, wherein the substrate made of transparent plastic is polycarbonate resin.
Claim 5
Dependent Claim
40 words
The optical information recording carrier as defined in claim 1, wherein an outer surface protection layer made of inorganic glass is further formed on the outer surface of the transparent plastic substrate at the side opposite to the recording layer.
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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) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |