US3567308A
Expired / Lapsed
US
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Rare-earth chalcogenide magneto-optical elements with protective layers
Assignee: International Business Machines Corp
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Filing: 1966-12-22
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Granted: 1971-03-02
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Expires: 1986-12-22
Abstract
Abstract The present invention relates to a novel magneto-optical device composed of a rare-earth chalcogenide. When such rare-earth chalcogenides are made in the form of crystals or of thin layers, they are subject to deterioration by exposure to the atmosphere. The use of a thin overlying protective layer having optical and magnetic properties compatible with the underlying rare-earth chalcogenide is highly desireable. In one example, Eu2O2 is employed as the protective layer for EuO.
Inventors
- 👤 Kie Y Ahn
- 👤 Siegfried Methfessel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:12
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; H01F10/187; C; C23; C23C; C23C14/00; C23C14/06; C23C14/08; C23C14/58; G; G02; G02F; G02F1/00; G02F1/0009; G02F1/0036
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |