US3441912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feedback current switch memory cell
Assignee: International Business Machines Corp
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Filing: 1966-01-28
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Granted: 1969-04-29
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Expires: 1986-01-28
Abstract
No abstract record available.
Inventors
- 👤 Robert A Henle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:42
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/286; G; G11; G11C; G11C11/00; G11C11/21; G11C11/34; G11C11/40; G11C11/41; G11C11/411
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A MEMORY SYSTEM COMPRISING A PLURALITY OF MEMORY CELLS, EACH MEMORY CELL COMPRISING AT LEAST FIRST, SECOND AND THIRD TRANSISTORS, THE COLLECTOR OF THE FIRST OF SAID TRANSISTORS BEING DIRECTLY CONNECTED TO THE BASE OF THE SECOND TRANSISTOR, A LOAD IMPEDANCE CONNECTED TO THE COLLECTOR OF SAID FIRST TRANSISTOR, AND A COMMON IMPEDANCE CONNECTED TO THE EMITTERS OF SAID FIRST, SECOND AND THIRD TRANSISTORS, EACH MEMORY CELL HAVING TWO QUIESCENT STATES, A FIRST STATE IN WHICH SAID FIRST TRANSISTOR IS CONDUCTIVE AND THE SECOND TRANSISTOR IS NONCONDUCTIVE, AND A SECOND STATE IN WHICH THE SECOND TRANSISTORS IS CONDUCTIVE AND THE FIRST TRANSISTOR IS NONCONDUCTIVE, SAID FIRST STATE DEFINING THE STORAGE OF A "1" BY SAID CELL, AND THE SECOND STATE DEFINING THE STORAGE OF A "0," AT LEAST THREE LINES CONNECTED TO EACH OF THE MEMORY CELLS, ONE OF SAID LINES BEING CONNECTED TO THE BASE OF SAID THIRD TRANSISTOR, MEANS, CONNECTED TO EACH OF SAID THREE LINES, FOR SELECTIVELY APPLYING PULSES TO THE BASES RESPECTIVELY OF EACH OF SAID FIRST, SECOND AND THRID TRANSISTORS IN EACH OF SAID MEMORY CELLS.
Claim 2
Dependent Claim
181 words
A MEMORY SYSTEM COMPRISING A PLURALITY OF MEMORY CELLS, EACH MEMORY CELL COMPRISING AT LEAST FIRST, SECOND AND THIRD TRANSISTORS, THE COLLECTOR OF THE FIRST OF SAID TRANSISTORS BEING DIRECTLY CONNECTED TO THE BASE OF THE SECOND TRANSISTOR, A LOAD IMPEDANCE CONNECTED TO THE COLLECTOR OF SAID FIRST TRANSISTOR, AND A COMMON IMPEDANCE CONNECTED TO THE EMITTERS OF SAID FIRST, SECOND AND THIRD TRANSISTORS, EACH MEMORY CELL HAVING TWO QUIESCENT STATES, A FIRST STATE IN WHICH SAID FIRST TRANSISTOR IS CONDUCTIVE AND THE SECOND TRANSISTOR IS NONCONDUCTIVE, AND A SECOND STATE IN WHICH THE SECOND TRANSISTORS IS CONDUCTIVE AND THE FIRST TRANSISTOR IS NONCONDUCTIVE, SAID FIRST STATE DEFINING THE STORAGE OF A "1" BY SAID CELL, AND THE SECOND STATE DEFINING THE STORAGE OF A "0," AT LEAST THREE LINES CONNECTED TO EACH OF THE MEMORY CELLS, ONE OF SAID LINES BEING CONNECTED TO THE BASE OF SAID THIRD TRANSISTOR, MEANS, CONNECTED TO EACH OF SAID THREE LINES, FOR SELECTIVELY APPLYING PULSES TO THE BASES RESPECTIVELY OF EACH OF SAID FIRST, SECOND AND THRID TRANSISTORS IN EACH OF SAID MEMORY CELLS.
References Cited (Backward Citations)
US3364362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-28 | 1972-10-28 | 1973-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-28 | 1976-10-28 | 1977-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-28 | 1980-10-28 | 1981-04-29 | $7700.00 | Window Closed / Lapsed |