US3642533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto-optical elements
Assignee: KIE Y AHN
•
Filing: 1970-04-28
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Granted: 1972-02-15
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Expires: 1990-04-28
Abstract
Abstract The present invention relates to a novel magneto-optical device composed of a rare-earth chalcogenide and to a method for making such device. 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 desirable. In one example, Eu2O3 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
2026-11-06 11:10
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/08; C23C14/58; G; G02; G02F; G02F1/00; G02F1/0009; G02F1/0036
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A method of forming a magneto-optically active element in an evacuated chamber comprising the steps of: vapor depositing a thin film of Eu0 onto a substrate while maintaining the latter at a temperature of 20* C. to 200* C., raising said substrate temperature to above 200* C. after said deposition has been completed, and bleeding oxygen into said evacuated chamber to cause the top surface of said Eu0 film to react with said oxygen so as to provide a protective layer of Eu203 with the initially deposited Eu0 film.
Claim 2
Dependent Claim
28 words
The method of forming a magneto-optically active element as set forth in claim 2 wherein a vacuum of the order of 10 5 mm. of Hg is used.
References Cited (Backward Citations)
US3376157A
Cited
US3434863A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |