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US3559191A
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Thin-ferromagnetic-film memory element using rf mixing for readout operation
Assignee: Unisys Corp
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Filing: 1967-03-01
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Granted: 1971-01-26
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Expires: 1987-03-01
Abstract
Abstract A THIN-FERROMAGNETIC-FILM MEMORY ELEMENT UTILIZING A PLURALITY OF CONCURRENT RF LONGITUDINAL DRIVE FIELDS AND A PULSE-LIKE DC TRANSVERSE DRIVE FIELD FOR PROVIDING A RESULTANT SUM-FREQUENCY READOUT SIGNAL THE POLARITY PHASE OF WHICH IS INDICATIVE OF THE INFORMATIONAL STATE OF THE MEMORY ELEMENT.
Inventors
- 👤 Virgil A Ehresman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:52
CPC Classifications
G; G11; G11C; G11C27/00; G11C27/02; G11C27/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |