US5156693A
Expired / Lapsed
US
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Information recording medium
Assignee: Ricoh Co Ltd
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Filing: 1991-02-19
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Granted: 1992-10-20
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Expires: 2011-02-19
Abstract
Abstract An information recording medium is disclosed which records information through the transition of two phases of a recording material, utilizing electromagnetic wave energy. The information recording medium comprises a recording layer made up of a recording material of a composition represented by the formula: wherein 6≦α≦13 8≦β≦17 18≦γ≦28 45≦δ≦66 α+β+γ+δ=100.
Inventors
- 👤 Yukio Ide
- 👤 Makoto Harigaya
- 👤 Yoshiyuki Kageyma
- 👤 Hiroko Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:15
CPC Classifications
C; C22; C22C; C22C45/00; G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24308; G11B2007/2431; G11B2007/24314; G11B2007/24316; G11B7/252; G11B7/257; G11B2007/25705; G11B2007/2571; G11B2007/25713; G11B7/253; G11B7/2533; G11B7/2534; G11B7/258; G11B7/2585; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12681
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
51 words
An information recording medium for writing information through the transition of two phases of a recording material, utilizing electromagnetic wave energy and comprising a recording layer which in turn comprises a recording material consisting of a composition represented by the formula: Ag.sub.α In.sub.β Te.sub.γ Sb.sub.δ wherein 6≦α≦13 8≦β≦17 18≦γ≦28 45≦δ≦66 α+β+γ+δ=100
Claim 2
Dependent Claim
51 words
An information recording medium for writing information through the transition of two phases of a recording material, utilizing electromagnetic wave energy and comprising a recording layer which in turn comprises a recording material consisting of a composition represented by the formula: Ag.sub.α In.sub.β Te.sub.γ Sb.sub.δ wherein 6≦α≦13 8≦β≦17 18≦γ≦28 45≦δ≦66 α+β+γ+δ=100
Claim 3
Dependent Claim
42 words
The information recording medium as claimed in claim 1, wherein 50 mol % or less of said recording material in said recording layer is in a crystalline state and the remaining 50 mol % or more thereof is in an amorphous state.
Claim 4
Dependent Claim
19 words
The information recording medium as claimed in claim 2, wherein said crystalline state consists essentially of AgSbTe 2 .
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) | 1995-10-20 | 1996-04-20 | 1996-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-20 | 2000-04-20 | 2000-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-20 | 2004-04-20 | 2004-10-20 | $7700.00 | Window Closed / Lapsed |