Patent US3221180A successfully refreshed from Google Patents.
US3221180A
Expired / Lapsed
US
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Memory circuits employing negative resistance elements
Assignee: RCA Corp
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Filing: 1960-09-12
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Granted: 1965-11-30
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Expires: 1980-09-12
Abstract
No abstract record available.
Inventors
- 👤 Melvin M Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:21
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/313; H03K3/315; G; G11; G11C; G11C11/00; G11C11/21; G11C11/34; G11C11/36; G11C11/38; G11C2211/00; G11C2211/56; G11C2211/561; G11C2211/5614
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A MEMORY COMPRISING, IN COMBINATION, A PAIR OF CIRCUITS, ONE INCLUDING A TUNNEL DIODE AND THE OTHER INCLUDING A TUNNEL RECTIFIER WHICH IS CONNECTED TO THE TUNNEL DIODE; MEANS COUPLED TO THE CONNECTION BETWEEN THE TUNNEL DIODE AND TUNNEL RECTIFIER FOR APPLYING A QUIESCENT OPERATING CURRENT IN PARALLEL TO THE TWO CIRCUITS AT A LEVEL SUCH THAT THE TUNNEL DIODE CAN ASSUME EITHER OF TWO STABLE VOLTAGE STAGES AND, IN EITHER OF THESE STATES OF THE TUNNEL RECTIFIER OPERATES IN ITS SUBSTANTIALLY CONSTANT CURRENT REGION; AND MEANS FOR APPLYING CONCIDENT WRITE PULSES TO THE TUNNEL DIODE AND FOR PLACING THE TUNNEL DIODE IN A DESIRED ONE OF ITS TWO STABLE STATES A READ PULSE TO ACROSS BOTH THE TUNNEL DIODE AND TUNNEL RECTIFIER FOR CAUSING THE TUNNEL RECTIFIER TO DRAW CURRENT WHEN THE TUNNEL DIODE IS IN A GIVEN ONE OF ITS STABLE STATES BUT NOT WHEN IT IS IN ITS OTHER STABLE STATE.
Claim 2
Dependent Claim
154 words
A MEMORY COMPRISING, IN COMBINATION, A PAIR OF CIRCUITS, ONE INCLUDING A TUNNEL DIODE AND THE OTHER INCLUDING A TUNNEL RECTIFIER WHICH IS CONNECTED TO THE TUNNEL DIODE; MEANS COUPLED TO THE CONNECTION BETWEEN THE TUNNEL DIODE AND TUNNEL RECTIFIER FOR APPLYING A QUIESCENT OPERATING CURRENT IN PARALLEL TO THE TWO CIRCUITS AT A LEVEL SUCH THAT THE TUNNEL DIODE CAN ASSUME EITHER OF TWO STABLE VOLTAGE STAGES AND, IN EITHER OF THESE STATES OF THE TUNNEL RECTIFIER OPERATES IN ITS SUBSTANTIALLY CONSTANT CURRENT REGION; AND MEANS FOR APPLYING CONCIDENT WRITE PULSES TO THE TUNNEL DIODE AND FOR PLACING THE TUNNEL DIODE IN A DESIRED ONE OF ITS TWO STABLE STATES A READ PULSE TO ACROSS BOTH THE TUNNEL DIODE AND TUNNEL RECTIFIER FOR CAUSING THE TUNNEL RECTIFIER TO DRAW CURRENT WHEN THE TUNNEL DIODE IS IN A GIVEN ONE OF ITS STABLE STATES BUT NOT WHEN IT IS IN ITS OTHER STABLE STATE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |