US3159821A
Expired / Lapsed
US
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Magnetic core matrix
Assignee: Unisys Corp
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Filing: 1957-09-25
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Granted: 1964-12-01
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Expires: 1977-09-25
Abstract
No abstract record available.
Inventors
- 👤 Thomas D Rossing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:19
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06007; G11C11/06014; G11C11/0605
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
154 words
A MEMORY MATRIX SYSTEM COMPRISING A PLURALITY OF PHYSICAL MEMORY PLANES EACH HAVING A PLURALITY OF SETS OF BISTABLE MAGNETIC CORES WITH EACH SET INCLUDING A DIFFERENT PLURALITY OF CORES, EACH DIFFERENT SET IN EACH DIFFERENT PLANE BEING A DIFFERENT BINARY WORD REGISTER, WRITING MEANS FOR CHANGING THE STATE OF EACH OF SAID CORES SELECTIVELY WHEREIN SAID MEANS INCLUDES FIRST AND SECOND WINDING MEANS FOR EACH CORE FOR CARRYING COINCIDENT CURRENTS RESPECTIVELY TO CAUSE A FIELD ALONG THE REMAMENT AXIS OF MAGNETIZATION IN THE CORES, THE FIRST WINDING MEANS FOR EACH CORE IN A GIVEN PLANE BEING INTERCONNECTED IN SERIES AND THE SECOND WINDING MEANS FOR THE CORES IN A GIVEN REGISTER IN EACH PLANE BEING SERIALLY INTERCONNECTED, AND A PLURALITY OF INTERROGATING MEANS SEPARATE FROM SAID WRITING MEANS EACH LINKING A DIFFERENT ONE AND ONLY ONE OF SAID SETS FOR CAUSING THE STATE OF THE CORES IN THE RESPECTIVE REGISTERS TO BE INTERROGATED.
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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) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |