US3562760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermomagnetic recording method and system
Assignee: Magnavox Electronic Systems Co
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Filing: 1968-06-13
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Granted: 1971-02-09
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Expires: 1988-06-13
Abstract
Abstract MAGNETIC LAYERS COMPRISING PARTICLES HAVING SEVERAL DIFFERENTLY ORIENTED EASY AXES OF MAGNETIZATION AND DISPERSED IN THE LAYERS AT RANDOM, ARE USED FOR PRODUCING MAGNETIC RECORDINGS USING MAGNETIC BIAS, LOCAL THERMAL TREATMENT AND BELOW ROOM TEMPERATURE COERCIVITY FIELDS FOR CHANGING THE MAGNETIZATION IN LOCALLY HEATED AREAS, PARTICULARLY CO-Y-FE2O3 IS SUGGESTED TO OBTAIN A THERMOMAGNETIC RECORDING THROUGH THE COMBINATION OF MAGNETIZING FIELD AND INFORMATION MODULATED THERMAL TREATMENT AT TEMPERATURES WELL BELOW THE CURIE POINT.
Inventors
- 👤 Stanton H Cushner
- 👤 Alan S Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:13
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/03; G03; G03G; G03G5/00; G03G5/16; G11B5/00; G11B2005/0002; G11B2005/0005; G11B2005/0021
Claims Analysis
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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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |