US3077586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic storage device
Assignee: International Business Machines Corp
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Filing: 1959-05-25
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Granted: 1963-02-12
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Expires: 1979-05-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Norman C Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:14
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
121 words
A STORAGE ELEMENT COMPRISING, A THIN FILM OF FERROMAGNETIC MATERIAL EXHIBITING AN EASY AXIS OF MAGNETIZATION DEFINING OPPOSITE STABLE STATES OF REMANENT FLUX ORIENTATION, SAID FILM COMPRISING SUCCESSIVE LAYERS OF RELATIVELY HIGH AND LOW COERCIVE FORCE MATERIAL, A PLURALITY OF WINDINGS INCLUDING AN OUTPUT WINDING COUPLING SAID FILM, MEANS INCLUDING A NUMBER OF SAID PLURALITY OF WINDINGS FOR SWITCHING SAID FILM FROM ONE TO ANOTHER OF SAID STABLE STATES, AND MEANS FOR NONDESTRUCTIVELY INTERROGATING THE STABLE STATE OF SAID ELEMENT COMPRISING MEANS FOR APPLYING A FIELD OF PREDETERMINED MAGNITUDE AND POLARITY ALONG THE EASY AXIS OF SAID FILM WHEREBY AN OUTPUT SIGNAL IS INDUCED ON SAID OUTPUT WINDING ONLY WHEN SAID FILM IS IN A PREDETERMINED ONE OF SAID STABLE STATES.
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) | 1966-02-11 | 1966-08-13 | 1967-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-11 | 1970-08-13 | 1971-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-11 | 1974-08-13 | 1975-02-12 | $7700.00 | Window Closed / Lapsed |