US3427472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Threshold detector employing tunnel diode-hot carrier diode-transistor in combination with backward diode for isolation
Assignee: International Business Machines Corp
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Filing: 1965-11-12
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Granted: 1969-02-11
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Expires: 1985-11-12
Abstract
No abstract record available.
Inventors
- 👤 Friedrich A Karner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:58
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/58; H03K3/00; H03K3/02; H03K3/313; H03K3/315
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A THRESHOLD DETECTOR COMPRISING: A TUNNEL DIODE; MEANS NORMALLY BIASING THE DIODE FOR OPERATION IN AN INITAL STABLE STATE; AN INPUT CIRCUIT ADAPTED FOR CONNECTION TO A SOURCE OF INPUT SIGNALS; A BACKWARD DIODE COUPLING THE INPUT CIRCUIT TO THE TUNNEL DIODE FOR SWITCHING THE TUNNEL DIODE TO ANOTHER STATE WHEN THE INPUT SIGNAL REACHES A PREDETERMINED THRESHOLD VALUE; A TRANSISTOR AMPLIFIER; A MEANS NORMALLY BIASING THE AMPLIFIER FOR OPERATION AT ONE LEVEL OF CONDUCTION; AND A HOT CARRIER DIODE CONNECTING THE TUNNEL DIODE AND THE BACKGROUND DIODE TO THE AMPLIFIER FOR OPERATING THE AMPLIFIER AT A DIFFERENT LEVEL OF CONDUCTION IN RESPONSE ONLY TO THE SWITICHING OF THE TUNNEL DIODE FROM ITS INITIAL STABLE STATE TO SAID OTHER STATE.
Claim 2
Dependent Claim
120 words
A THRESHOLD DETECTOR COMPRISING: A TUNNEL DIODE; MEANS NORMALLY BIASING THE DIODE FOR OPERATION IN AN INITAL STABLE STATE; AN INPUT CIRCUIT ADAPTED FOR CONNECTION TO A SOURCE OF INPUT SIGNALS; A BACKWARD DIODE COUPLING THE INPUT CIRCUIT TO THE TUNNEL DIODE FOR SWITCHING THE TUNNEL DIODE TO ANOTHER STATE WHEN THE INPUT SIGNAL REACHES A PREDETERMINED THRESHOLD VALUE; A TRANSISTOR AMPLIFIER; A MEANS NORMALLY BIASING THE AMPLIFIER FOR OPERATION AT ONE LEVEL OF CONDUCTION; AND A HOT CARRIER DIODE CONNECTING THE TUNNEL DIODE AND THE BACKGROUND DIODE TO THE AMPLIFIER FOR OPERATING THE AMPLIFIER AT A DIFFERENT LEVEL OF CONDUCTION IN RESPONSE ONLY TO THE SWITICHING OF THE TUNNEL DIODE FROM ITS INITIAL STABLE STATE TO SAID OTHER STATE.
References Cited (Backward Citations)
US3214608A
Cited
US3239775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |