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US3248571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Logic circuit
Assignee: Unisys Corp
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Filing: 1963-08-07
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Granted: 1966-04-26
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Expires: 1983-08-07
Abstract
No abstract record available.
Inventors
- 👤 Jack S Cubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:49
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/33; H03K19/00; H03K19/02; H03K19/08; H03K19/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
197 words
A LOGIC CIRCUIT COMPRISING, A TUNNEL DIODE EXHIBITING TWO STABLE OPERATING CONDITIONS, BIAS MEANS CONNECTED TO SAID TUNNEL DIODE TO PROVIDE BISTABLE OPERATION THEREOF, INPUT MEANS FOR PROVIDING INPUT SIGNALS HAVING TWO DIFFERENT LEVELS, COUPLING MEANS CONNECTED TO SAID INPUT MEANS AND TO SAID TUNNEL DIODE, SAID COUPLING MEANS INCLUDING A DIODE WHICH RELATIVELY NONCONDUCTING IN RESPONSE TO EITHER LEVEL OF AN INPUT SIGNAL THEREBY TO ISOLATE SAID TUNNEL A DIODE FROM SAID INPUT MEANS, CHARGE STORAGE MEANS CONNECTED TO SAID COUPLING MEANS AND ADAPTED TO STORE CHARGE THEREIN IN RESPONSE TO ONE LEVEL OF SAID INPUT SIGNAL, SIGNAL SUPPLYING MEANS CONNECTED TO SAID CHARGE STORAGE MEANS FOR PROVIDING REVERSE CURRENT IN SAID CHARGE STORAGE MEANS SUBSEQUENT TO THE STORAGE OF CHARGE THEREIN SUCH THAT A LARGE CURRENT IS PASSED TO SAID TUNNEL DIODE VIA SAID DIODE IN SAID COUPLING MEANS WHEREBY SAID TUNNEL DIODE IS SWITCHED FROM ONE OPERATING STATE TO THE OTHER, POTENTIAL CLAMPING MEANS CONNECTED TO SAID SIGNAL SUPPLYING MEANS SUCH THAT THE POTENTIAL AT SAID CHARGE STORAGE MEANS DOES NOT VARY SIGNIFICANTLY IN THE ABSENCE OF STORAGE CHARGE THEREIN, AND OUTPUT MEANS CONNECTED TO SAID TUNNEL DIODE FOR DETECTING THE OPERATING CONDITION THEREOF.
Claim 2
Dependent Claim
197 words
A LOGIC CIRCUIT COMPRISING, A TUNNEL DIODE EXHIBITING TWO STABLE OPERATING CONDITIONS, BIAS MEANS CONNECTED TO SAID TUNNEL DIODE TO PROVIDE BISTABLE OPERATION THEREOF, INPUT MEANS FOR PROVIDING INPUT SIGNALS HAVING TWO DIFFERENT LEVELS, COUPLING MEANS CONNECTED TO SAID INPUT MEANS AND TO SAID TUNNEL DIODE, SAID COUPLING MEANS INCLUDING A DIODE WHICH RELATIVELY NONCONDUCTING IN RESPONSE TO EITHER LEVEL OF AN INPUT SIGNAL THEREBY TO ISOLATE SAID TUNNEL A DIODE FROM SAID INPUT MEANS, CHARGE STORAGE MEANS CONNECTED TO SAID COUPLING MEANS AND ADAPTED TO STORE CHARGE THEREIN IN RESPONSE TO ONE LEVEL OF SAID INPUT SIGNAL, SIGNAL SUPPLYING MEANS CONNECTED TO SAID CHARGE STORAGE MEANS FOR PROVIDING REVERSE CURRENT IN SAID CHARGE STORAGE MEANS SUBSEQUENT TO THE STORAGE OF CHARGE THEREIN SUCH THAT A LARGE CURRENT IS PASSED TO SAID TUNNEL DIODE VIA SAID DIODE IN SAID COUPLING MEANS WHEREBY SAID TUNNEL DIODE IS SWITCHED FROM ONE OPERATING STATE TO THE OTHER, POTENTIAL CLAMPING MEANS CONNECTED TO SAID SIGNAL SUPPLYING MEANS SUCH THAT THE POTENTIAL AT SAID CHARGE STORAGE MEANS DOES NOT VARY SIGNIFICANTLY IN THE ABSENCE OF STORAGE CHARGE THEREIN, AND OUTPUT MEANS CONNECTED TO SAID TUNNEL DIODE FOR DETECTING THE OPERATING CONDITION THEREOF.
References Cited (Backward Citations)
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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) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |