US5298305A
Expired / Lapsed
US
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Phase-change type information recording medium
Assignee: Ricoh Co Ltd
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Filing: 1992-12-29
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Granted: 1994-03-29
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Expires: 2012-12-29
Abstract
Abstract A phase-change type information recording medium composed of a substrate and a recording layer formed on the substrate, which recording layer is composed of a recording material with the composition thereof in terms of atomic percentage being represented by general formula: Ag.sub.α In.sub.β Te.sub.γ Sb.sub.δ +M.sub.x 0.5≦x≦10, α+β+γ+δ+x=100, and M is one wherein 5≦α≦17, 6≦β≦18, 13≦γ≦36, 33≦δ≦77, additional element selected from the group consisting of B, N, C, P and Si.
Inventors
- 👤 Michiaki Shinozuka
- 👤 Makoto Harigaya
- 👤 Yukio Ide
- 👤 Yoshiyuki Kageyama
- 👤 Hiroko Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:54
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24308; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B2007/24318; G11B2007/24322; G11B2007/24328; G11B7/004; G11B7/0045; G11B7/00454; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10S430/165; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
64 words
A phase-change type information recording medium comprising a substrate and a recording layer formed thereon, comprising a recording material with the composition thereof in terms of atomic percentage being represented by general formula: Ag.sub.α In.sub.β Te.sub.γ Sb.sub.δ +M.sub.x wherein 5≦α≦17, 6≦β≦18, 13≦γ≦36, 33 ≦δ≦77, 0.5≦x≦10, α+β+γ+δ+x=100, and M is one additional element selected from the group consisting of B, N, C, P and Si.
Claim 2
Dependent Claim
64 words
A phase-change type information recording medium comprising a substrate and a recording layer formed thereon, comprising a recording material with the composition thereof in terms of atomic percentage being represented by general formula: Ag.sub.α In.sub.β Te.sub.γ Sb.sub.δ +M.sub.x wherein 5≦α≦17, 6≦β≦18, 13≦γ≦36, 33 ≦δ≦77, 0.5≦x≦10, α+β+γ+δ+x=100, and M is one additional element selected from the group consisting of B, N, C, P and Si.
Claim 3
Dependent Claim
26 words
The phase-change type information recording medium as claimed in claim 1, wherein said additional element represented by M has a radius of 1.2 Å or less.
Claim 4
Dependent Claim
27 words
The phase-change type information recording medium as claimed in claim 1, wherein the thickness of said recording layer is in the range of 200 to 1000 Å.
Claim 5
Dependent Claim
24 words
The phase-change type information recording medium as claimed in claim 1, further comprising a protective layer provided between said substrate and said recording layer.
Claim 6
Dependent Claim
21 words
The phase-change type information recording medium as claimed in claim 1, further comprising a protective layer provided on said recording layer.
Claim 7
Dependent Claim
51 words
The phase-change type information recording medium as claimed in claim 1, further comprising a lower protective layer between said substrate and said recording layer, an upper protective layer on said recording layer, an upper protective layer on said upper protective layer, and an organic protective layer on said upper protective layer.
Claim 8
Dependent Claim
35 words
The phase-change type information recording medium as claimed in claim 6, further comprising an antistatic layer provided on the back side of said substrate, opposite to said lower protective layer with respect to said substrate.
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) | 1997-03-28 | 1997-09-27 | 1998-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-28 | 2001-09-27 | 2002-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-28 | 2005-09-27 | 2006-03-29 | $7700.00 | Window Closed / Lapsed |