US3274571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic memory circuits
Assignee: AT&T Inc
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Filing: 1962-08-07
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Granted: 1966-09-20
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Expires: 1982-08-07
Abstract
No abstract record available.
Inventors
- 👤 Andrew H Bobeck
- 👤 James L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:52
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06085; G11C11/06007; G11C11/06078; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49069
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
196 words
A MAGNETIC MEMORY CIRCUIT COMPRISING A HIGH MAGNETIC PERMEABILITY BASE PLATE HAVING A BOTTOM PORTION AND A PLURALITY OF POSTS PROTRUDING FROM SAID BOTTOM PORTION, AN OVERLAY MAGNETIC SHEET HAVING SUBSTANTIALLY RECTANGULAR HYSTERESIS CHARACTERISTICS POSITIONED CONTIGUOUS TO SAID POSTS, A FIRST AND A SECOND MEMORY CELL, EACH BEING DEFINED BY SAID BOTTOM PORTION, SAID OVERLAY SHEET AND TWO OF SAID POSTS, EACH OF SAID MEMORY CELLS INCLUDING A CLOSED FLUX PATH THEREIN, SAID FIRST AND SECOND MEMORY CELLS TOGETHER COMPRISING A BIT ADDRESS, MEANS FOR ESTABLISHING A FIRST REMANENT MAGNETIC CONDITION IN SAID FIRST MEMORY CELL AND A SECOND REMANENT MAGNETIC CONDITION IN SAID SECOND MEMORY CELL INDICATIVE OF A FIRST BINARY VALUE STORED IN SAID BIT ADDRESS AND FOR ESTABLISHING SAID SECOND REMANENT MAGNETIC CONDITION IN SAID FIRST CELL AND SAID FIRST REMANENT MAGNETIC CONDITION IN SAID SECOND CELL INDICATIVE OF A SECOND BINARY VALUE STORED IN SAID BIT ADDRESS, MEANS FOR ESTABLISINING SAID FIRST REMANENT MAGNETIC CONDITION IN BOTH OF SAID FIRST AND SECOND CELLS, AND MEANS FOR DETECTING THE FLUX REVERSALS EFFECTED IN EITHER SAID FIRST OR SAID SECOND CELL WHEN IT IS SWITCHED FROM SAID SECOND TO SAID FIRST REMANENT MAGNETIC CONDITION.
Claim 2
Dependent Claim
196 words
A MAGNETIC MEMORY CIRCUIT COMPRISING A HIGH MAGNETIC PERMEABILITY BASE PLATE HAVING A BOTTOM PORTION AND A PLURALITY OF POSTS PROTRUDING FROM SAID BOTTOM PORTION, AN OVERLAY MAGNETIC SHEET HAVING SUBSTANTIALLY RECTANGULAR HYSTERESIS CHARACTERISTICS POSITIONED CONTIGUOUS TO SAID POSTS, A FIRST AND A SECOND MEMORY CELL, EACH BEING DEFINED BY SAID BOTTOM PORTION, SAID OVERLAY SHEET AND TWO OF SAID POSTS, EACH OF SAID MEMORY CELLS INCLUDING A CLOSED FLUX PATH THEREIN, SAID FIRST AND SECOND MEMORY CELLS TOGETHER COMPRISING A BIT ADDRESS, MEANS FOR ESTABLISHING A FIRST REMANENT MAGNETIC CONDITION IN SAID FIRST MEMORY CELL AND A SECOND REMANENT MAGNETIC CONDITION IN SAID SECOND MEMORY CELL INDICATIVE OF A FIRST BINARY VALUE STORED IN SAID BIT ADDRESS AND FOR ESTABLISHING SAID SECOND REMANENT MAGNETIC CONDITION IN SAID FIRST CELL AND SAID FIRST REMANENT MAGNETIC CONDITION IN SAID SECOND CELL INDICATIVE OF A SECOND BINARY VALUE STORED IN SAID BIT ADDRESS, MEANS FOR ESTABLISINING SAID FIRST REMANENT MAGNETIC CONDITION IN BOTH OF SAID FIRST AND SECOND CELLS, AND MEANS FOR DETECTING THE FLUX REVERSALS EFFECTED IN EITHER SAID FIRST OR SAID SECOND CELL WHEN IT IS SWITCHED FROM SAID SECOND TO SAID FIRST REMANENT MAGNETIC CONDITION.
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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |