Patent US3571584A successfully refreshed from Google Patents.
Patent US4580146A successfully refreshed from Google Patents.
US4580146A
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Information recording material
Assignee: Asahi Kasei Corp
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Filing: 1983-07-05
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Granted: 1986-04-01
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Expires: 2003-07-05
Abstract
Abstract An information recording material comprising a substrate, a metallic recording layer composed mainly of Bi and a Cr layer interposed therebetween has been found to be extremely excellent in C/N ratio as well as in storage stability and archivability. The information recording material of this type can be advantageously employed for video image signal memory, still video recording, and the like.
Inventors
- 👤 Masafumi Nakao
- 👤 Isao Morimoto
- 👤 Koichi Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:44
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/257; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24314; G11B2007/25705; G11B2007/25706; G11B7/004; G11B7/0045; G11B7/00452; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/165
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
86 words
An information recording material having a high sensitivity and C/N ratio comprising a substrate having superimposed thereon in the following order a first Cr layer having a thickness of 10 to 200 Å, a metallic recording layer composed mainly of Bi, and a stabilizing layer of a first metallic compound said relationship of thickness of said Cr layer together with said metallic recording layer composed mainly of Bi producing an information recording layer which suppresses increased noise level and has a high sensitivity and C/N ratio.
Claim 2
Dependent Claim
86 words
An information recording material having a high sensitivity and C/N ratio comprising a substrate having superimposed thereon in the following order a first Cr layer having a thickness of 10 to 200 Å, a metallic recording layer composed mainly of Bi, and a stabilizing layer of a first metallic compound said relationship of thickness of said Cr layer together with said metallic recording layer composed mainly of Bi producing an information recording layer which suppresses increased noise level and has a high sensitivity and C/N ratio.
Claim 3
Dependent Claim
21 words
An information recording material according to claim 1, wherein the thickness of the first Cr layer is 30 to 80 Å.
Claim 4
Dependent Claim
48 words
An information recording material according to claim 1, which further comprises a second Cr layer provided either between said metallic recording layer and said stabilizing layer of a first metallic compound or on the side of said stabilizing layer of a first metallic compound remote from said substrate.
Claim 5
Dependent Claim
20 words
An information recording material according to claim 1, wherein said Bi metallic recording layer further includes 16 to 30% Sb.
Claim 6
Dependent Claim
92 words
An information recording material according to claim 1, wherein said stabilizing layer of a first metallic compound comprises at least one member selected from the group consisting of oxides, nitrides and fluorides of a metal selected from Be, Li, B, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Sr, Y, Zr, Nb, Tc, Ru, Rh, Ag, In, Sn, Sb, Ba, La, Hf, Ta, Re, Ir, Tl, Pb, Bi, Ce, Dy, Er, Gd, Nd, Pr, Sm, Pm, Eu, Tb, Ho, Tm, Yb and Lu.
Claim 7
Dependent Claim
62 words
An information recording material according to claim 1, wherein said stabilizing layer of a first metallic compound comprises at least one member selected from the group consisting of oxides of a metal selected from Si, Al, Ge, Zr, Ta, Bi, Li, Mg, Ti, La, Ce, Y, Dy, Er, Gd, Hf, Sm, Cr, Nd, Pr, Pm, Eu, Tb, Ho, Tm, Yb and Lu.
Claim 8
Dependent Claim
53 words
An information recording material according to claim 1, wherein said stabilizing layer of a first metallic compound comprises at least one member selected from the group consisting of oxides of a metal selected from Si, Al, Ge, Zr, Bi, Mg, Ti, La, Ce, Y, Dy, Er, Gd, Hf, Sm, Cr, Nd and Pr.
Claim 9
Dependent Claim
44 words
An information recording material according to claim 3, wherein said stabilizing layer of a first metallic compound comprises at least one member selected from the group consisting of oxides of a metal selected from La, Ce, Y, Dy, Er, Gd, Sm, Nd and Pr.
Claim 10
Dependent Claim
38 words
An information recording material according to claim 1, which further comprises a layer of a second metallic compound either between the substrate and the first Cr layer or between the first Cr layer and the metallic recording layer.
Claim 11
Dependent Claim
91 words
An information recording material according to claim 9, wherein said layer of a second metallic compound comprises at least one member selected from the group consisting of oxides, nitrides and fluorides of a metal selected from Be, Li, B, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Sr, Y, Zr, Nb, Tc, Ru, Rh, Ag, In, Sn, Sb, Ba, La, Hf, Ta, Re, Ir, Tl, Pb, Bi, Ce, Dy, Er, Gd, Nd, Pr, Sm, Pm, Eu, Tb, Ho, Tm, Yb and Lu.
Claim 12
Dependent Claim
52 words
An information recording material according to claim 9, wherein said layer of a second metallic compound comprises at least one member selected from the group consisting of oxides of a rare earth element selected from Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu.
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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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |