US3197653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Random or associative access memory
Assignee: International Business Machines Corp
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Filing: 1961-04-03
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Granted: 1965-07-27
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Expires: 1981-04-03
Abstract
No abstract record available.
Inventors
- 👤 John L Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:17
CPC Classifications
G; G11; G11C; G11C15/00; G11C15/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A MEMORY CELL ADAPTED FOR NONDESTRUCTIVE READOUT COMPRISING: A BIPOLAR DIVER CIRCUIT; A FIRST AND A SECOND READ-OUT CIRCUIT HAVING A FIRST AND A SECOND THRESHOLD SIGNAL LEVEL RESPECTIVELY; A BISTABLE CIRCUIT ELEMENT; A COUPLING NETWORK INCLUDING TWO SERIES RESISTORS CONNECTED BETWEEN SAID BIPOLAR DRIVER AND SAID ELEMENT; A FIRST DIODE CONNECTED BETWEEN SAID FIRST READ-OUT CIRCUIT AND A POINT INTERMEDIATE SAID TWO RESISTORS; A SECOND DIODE CONNECTED BETWEEN SAID SECOND READ-OUT CIRCUIT AND SAID INTERMEDIATE POINT; BIASING MEANS CONNECTED AT THE JUNCTION OF SAID COUPLING NETWORK AND SAID ELEMENT FOR BIASING SAID ELEMENT AND SAID DIODES SO THAT A POSITIVE SIGNAL EXCEEDING SAID FIRST THRESHOLD FROM SAID BIPOLAR DRIVER PASSES THROUGH SAID FIRST DIODE TO SAID FIRST READOUT CIRCUIT ONLY WHEN SAID ELEMENT RESIDES IN ONE OF SAID STABLE STATES AND A NEGATIVE SIGNAL LESS THAN SAID SECOND
Claim 2
Dependent Claim
139 words
A MEMORY CELL ADAPTED FOR NONDESTRUCTIVE READOUT COMPRISING: A BIPOLAR DIVER CIRCUIT; A FIRST AND A SECOND READ-OUT CIRCUIT HAVING A FIRST AND A SECOND THRESHOLD SIGNAL LEVEL RESPECTIVELY; A BISTABLE CIRCUIT ELEMENT; A COUPLING NETWORK INCLUDING TWO SERIES RESISTORS CONNECTED BETWEEN SAID BIPOLAR DRIVER AND SAID ELEMENT; A FIRST DIODE CONNECTED BETWEEN SAID FIRST READ-OUT CIRCUIT AND A POINT INTERMEDIATE SAID TWO RESISTORS; A SECOND DIODE CONNECTED BETWEEN SAID SECOND READ-OUT CIRCUIT AND SAID INTERMEDIATE POINT; BIASING MEANS CONNECTED AT THE JUNCTION OF SAID COUPLING NETWORK AND SAID ELEMENT FOR BIASING SAID ELEMENT AND SAID DIODES SO THAT A POSITIVE SIGNAL EXCEEDING SAID FIRST THRESHOLD FROM SAID BIPOLAR DRIVER PASSES THROUGH SAID FIRST DIODE TO SAID FIRST READOUT CIRCUIT ONLY WHEN SAID ELEMENT RESIDES IN ONE OF SAID STABLE STATES AND A NEGATIVE SIGNAL LESS THAN SAID SECOND
References Cited (Backward Citations)
US2673936A
Cited
US3107345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |