US3223985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nondestructive magnetic data store
Assignee: Unisys Corp
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Filing: 1961-10-25
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Granted: 1965-12-14
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Expires: 1981-10-25
Abstract
No abstract record available.
Inventors
- 👤 Eric E Bittmann
- 👤 Joseph W Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:38
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A DATA STORE COMPRISING AT LEAST ONE FERROMAGNETIC STORAGE ELEMENT CAPABLE OF ATTACHING OPPOSED STATES OF RESIDUALLY FLUX DENSITY ALONG A PREFERRED AXIS OF MAGNETIZATION, FIRST MEANS FOR MAGNETIZING SAID ELEMENT SUBSTANTIALLY IN A PREDETERMINED ONE OF SAID STATES, SAID ELEMENT FORMING SUBSTANTIALLY A SINGLE LARGE DOMAIN OF SAID PREDETERMINED STATE, SECOND MEANS FOR MAGNETIZING A NARROW REGION OF SAID SINGLE DOMAIN TO A POSITION NEARLY TRANSVERSE TO SAID PREFERRED DIRECTION, SAID NARROW REGION SEPARATING SAID SINGLE DOMAIN INTO NEIGHBORING DOMAINS OF SAID PREDETERMINED STATE, THE DEMAGNETIZING FORCES PRESENT IN SAID NEIGHBORING DOMAINS BEING EFFECTIVE UPON THE TERMINATION OF SAID SECOND MEANS TO CAUSE SAID NARROW REGION TO ASSUME A STATE OPPOSITE TO SAID PREDETERMINED STATE, SAID NARROW REGION FORMING A DOMAIN OF ONE STATE BORDERED BY NEIGHBORING DOMAINS OF OPPOSITE STATE.
Claim 2
Dependent Claim
132 words
A DATA STORE COMPRISING AT LEAST ONE FERROMAGNETIC STORAGE ELEMENT CAPABLE OF ATTACHING OPPOSED STATES OF RESIDUALLY FLUX DENSITY ALONG A PREFERRED AXIS OF MAGNETIZATION, FIRST MEANS FOR MAGNETIZING SAID ELEMENT SUBSTANTIALLY IN A PREDETERMINED ONE OF SAID STATES, SAID ELEMENT FORMING SUBSTANTIALLY A SINGLE LARGE DOMAIN OF SAID PREDETERMINED STATE, SECOND MEANS FOR MAGNETIZING A NARROW REGION OF SAID SINGLE DOMAIN TO A POSITION NEARLY TRANSVERSE TO SAID PREFERRED DIRECTION, SAID NARROW REGION SEPARATING SAID SINGLE DOMAIN INTO NEIGHBORING DOMAINS OF SAID PREDETERMINED STATE, THE DEMAGNETIZING FORCES PRESENT IN SAID NEIGHBORING DOMAINS BEING EFFECTIVE UPON THE TERMINATION OF SAID SECOND MEANS TO CAUSE SAID NARROW REGION TO ASSUME A STATE OPPOSITE TO SAID PREDETERMINED STATE, SAID NARROW REGION FORMING A DOMAIN OF ONE STATE BORDERED BY NEIGHBORING DOMAINS OF OPPOSITE STATE.
References Cited (Backward Citations)
US3058099A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |