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Patent US4786559A successfully refreshed from Google Patents.
US4786559A
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Magnetooptical storage element
Assignee: Sharp Corp
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Filing: 1986-12-22
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Granted: 1988-11-22
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Expires: 2006-12-22
Abstract
Abstract A magnetooptical storage element comprising a recording layer of a multi-layered structure including a reflecting film, said reflecting film being made of metals or metalloids having a low thermal conductivity coefficient.
Inventors
- 👤 Yoshiteru Murakami
- 👤 Akira Takahashi
- 👤 Hiroyuki Katayama
- 👤 Tomoyuki Miyake
- 👤 Kenji Ohta
- 👤 Michinobu Mieda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:13
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; G11B11/10589; G11B11/10591; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
85 words
A magnetooptical storage element comprising a recording layer of a multi-layered structure, said structure including a transparent substrate, a first transparent dielectric film on said substrate, a thin film of an amorphous alloy containing rare-earth transition metals on said first transparent dielectric film, a second transparent dielectric film on said thin film, and a reflecting film on said second transparent dielectric film, said reflecting film being made of metals or metalloids is selected from the group consisting of tantalum, lead, zirconium, bismuth, tellurium, and selenium.
Claim 2
Dependent Claim
85 words
A magnetooptical storage element comprising a recording layer of a multi-layered structure, said structure including a transparent substrate, a first transparent dielectric film on said substrate, a thin film of an amorphous alloy containing rare-earth transition metals on said first transparent dielectric film, a second transparent dielectric film on said thin film, and a reflecting film on said second transparent dielectric film, said reflecting film being made of metals or metalloids is selected from the group consisting of tantalum, lead, zirconium, bismuth, tellurium, and selenium.
Claim 3
Dependent Claim
31 words
A magnetooptical storage element according to claim 1, wherein said transparent substrate is made of one selected from the group consisting of glass, polycarbonate, an acrylic resin, and an epoxy resin.
Claim 4
Dependent Claim
34 words
A magnetooptical storage element according to claim 1, wherein said first and/or second transparent dielectric films are made of one selected from the group consisting of AlN, SiN, ZnN, SiO, and SiO 2 .
Claim 5
Dependent Claim
31 words
A magnetooptical storage element according to claim 1, wherein said thin film is made of an amorphous alloy of one selected from the group consisting of GdTbFe, GdTbFeCo, TbFe, and TbFeCo.
References Cited (Backward Citations)
US4230939A
Cited
EP0111988A1
Cited
JPS6034133A
Cited
US4610903A
Cited
JPS6192455A
Cited
JPS61115252A
Cited
EP0192256A2
Cited
US4717628A
Cited
EP0195532A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |