US4152486A
Expired / Lapsed
US
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Magneto-optical memory medium
Assignee: KDDI Corp
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Filing: 1977-03-10
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Granted: 1979-05-01
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Expires: 1997-03-10
Abstract
Abstract A magneto-optical memory medium having an easy axis of magnetization perpendicular to the medium surface. The memory medium is formed by an amorphous Dy-Fe system alloy film containing 18 to 28 atom % Dy.
Inventors
- 👤 Nobutake Imamura
- 👤 Yoshinori Mimura
- 👤 Toshihiko Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:11
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/12; H01F10/13; H01F10/133; H01F10/135; H01F10/136; C; C22; C22C; C22C45/00; C22C45/02; G; G11; G11C; G11C13/00; G11C13/04; G11C13/06; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
43 words
A magneto-optical memory medium having as easy axis of magnetization perpendicular to a medium surface, comprising: an amorphous alloy having a Curie point of about 70° C.; said amorphous alloy consisting essentially of 18 to 28 atomic % Dy and the balance Fe.
Claim 2
Dependent Claim
43 words
A magneto-optical memory medium having as easy axis of magnetization perpendicular to a medium surface, comprising: an amorphous alloy having a Curie point of about 70° C.; said amorphous alloy consisting essentially of 18 to 28 atomic % Dy and the balance Fe.
Claim 3
Dependent Claim
20 words
A magneto-optical memory medium according to claim 1 in the form of a film having a thickness greater than 500A.
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) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |