US3274446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Darlington configuration transistor circuit
Assignee: Hitachi Ltd
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Filing: 1963-01-03
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Granted: 1966-09-20
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Expires: 1983-01-03
Abstract
No abstract record available.
Inventors
- 👤 Nagata Minoru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:10
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/565; G05F1/569; G05F1/573
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A DARLINGTON CONFIGURATION TRANSISTOR CIRCUIT CONSISTING OF A COMBINATION OF A PLURALITY OF TRANSISTORS WHICH COMPRISES: A CIRCUIT CONSTRUCTION HAVING AT LEAST TWO TRANSISTORS WHEREIN THE EMITTER OF A SECOND TRANSISTOR IS DIRECTLY CONNECTED TO THE BASE OF A FIRST TRANSISTOR AND THE COLLECTORS OF SAID RESPECTIVE TRANSISTORS ARE CONNECTED IN COMMON; AND SWITCHING MEANS INSERTED BETWEEN THE BASE OF SAID SECOND TRANSISTOR AND THE EMITTERS OF SAID RESPECTIVE TRANSISTORS, WHEREBY, WHEN SAID SWICTHING MEANS ARE SIMULTANEOUSLY CLOSED, THE CONNECTION BETWEEN THE EMITTERS OF SAID RESPECTIVE TRANSISTORS AND THE BASE OF SAID SECOND TRANSISTOR IN SAID CIRCUIT CONSTRUCTION IS SHORTED TO CUT-OFF SAID DARLINGTON TRANSISTOR CIRCUIT.
Claim 2
Dependent Claim
106 words
A DARLINGTON CONFIGURATION TRANSISTOR CIRCUIT CONSISTING OF A COMBINATION OF A PLURALITY OF TRANSISTORS WHICH COMPRISES: A CIRCUIT CONSTRUCTION HAVING AT LEAST TWO TRANSISTORS WHEREIN THE EMITTER OF A SECOND TRANSISTOR IS DIRECTLY CONNECTED TO THE BASE OF A FIRST TRANSISTOR AND THE COLLECTORS OF SAID RESPECTIVE TRANSISTORS ARE CONNECTED IN COMMON; AND SWITCHING MEANS INSERTED BETWEEN THE BASE OF SAID SECOND TRANSISTOR AND THE EMITTERS OF SAID RESPECTIVE TRANSISTORS, WHEREBY, WHEN SAID SWICTHING MEANS ARE SIMULTANEOUSLY CLOSED, THE CONNECTION BETWEEN THE EMITTERS OF SAID RESPECTIVE TRANSISTORS AND THE BASE OF SAID SECOND TRANSISTOR IN SAID CIRCUIT CONSTRUCTION IS SHORTED TO CUT-OFF SAID DARLINGTON TRANSISTOR CIRCUIT.
References Cited (Backward Citations)
US3178617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |