US3277386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overload protection circuit for transistor amplifiers
Assignee: Torio KK
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Filing: 1963-10-21
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Granted: 1966-10-04
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Expires: 1983-10-21
Abstract
No abstract record available.
Inventors
- 👤 Miyazawa Kazumichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:15
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
A MULTISTAGE TRANSISTOR AMPLIFIER HAVING AN OVERLOAD PROTECTIVE CIRCUIT, COMPRISING A PLURALITY OF COUPLED AMPLIFIER STAGES, A RESISTOR COUPLED TO THE OUTPUT SIDE OF THE LAST AMPLIFIER STAGE AND DERIVING A PULSATING VOLTAGE FROM SAID LAST AMPLIFIER STAGE WHICH IS RESPONSIVE TO THE INPUT SIGNAL TO SAID AMPLIFIER, A FIRST PROTECTIVE TRANSISTOR HAVING SAID RESISTOR COUPLED TO THE BASE THEREOF, A RECTIFIER CONNECTED BETWEEN SAID BASE AND SAID RESISTOR, THE COLLECTOR OF SAID FIRST PROTECTIVE TRANSISTOR BEING COUPLED TO THE COLLECTOR OF THE FIRST STAGE TRANSISTOR OF SAID AMPLIFIER, A FIRST NON-LINEAR RECTIFIER COUPLED BETWEEN THE EMITTER OF SAID FIRST PROTECTIVE TRANSISTOR AND THE EMITTER OF SAID FIRST STAGE TRANSISTOR, A SECOND PROTECTIVE TRANSISTOR HAVING A POLARITY OPPOSITE THAT OF THE FIRST STAGE TRANSISTOR AND HAVING THE COLLECTOR THEREOF COUPLED TO THE EMITTER OF SAID FIRST STAGE TRANSISTOR, A PAIR OF SERIES CONNECTED VOLTAGE DIVIDING RESISTORS COUPLED BETWEEN THE COLLECTOR OF THE FIRST STAGE TRANSISTOR AND THE -B LINE OF SAID AMPLIFIER AND THE BASE OF SAID SECOND PROTECTIVE TRANSISTOR BEING CONNECTED TO THE CONNECTION BETWEEN SAID VOLTAGE DIVIDING RESISTORS, AND A SECOND NON-LINEAR RECTIFIER COUPLED BETWEEN THE EMITTER OF SAID SECOND PROTECTIVE TRANSISTOR AND THE -B LINE OF SAID AMPLIFIER.
Claim 2
Dependent Claim
201 words
A MULTISTAGE TRANSISTOR AMPLIFIER HAVING AN OVERLOAD PROTECTIVE CIRCUIT, COMPRISING A PLURALITY OF COUPLED AMPLIFIER STAGES, A RESISTOR COUPLED TO THE OUTPUT SIDE OF THE LAST AMPLIFIER STAGE AND DERIVING A PULSATING VOLTAGE FROM SAID LAST AMPLIFIER STAGE WHICH IS RESPONSIVE TO THE INPUT SIGNAL TO SAID AMPLIFIER, A FIRST PROTECTIVE TRANSISTOR HAVING SAID RESISTOR COUPLED TO THE BASE THEREOF, A RECTIFIER CONNECTED BETWEEN SAID BASE AND SAID RESISTOR, THE COLLECTOR OF SAID FIRST PROTECTIVE TRANSISTOR BEING COUPLED TO THE COLLECTOR OF THE FIRST STAGE TRANSISTOR OF SAID AMPLIFIER, A FIRST NON-LINEAR RECTIFIER COUPLED BETWEEN THE EMITTER OF SAID FIRST PROTECTIVE TRANSISTOR AND THE EMITTER OF SAID FIRST STAGE TRANSISTOR, A SECOND PROTECTIVE TRANSISTOR HAVING A POLARITY OPPOSITE THAT OF THE FIRST STAGE TRANSISTOR AND HAVING THE COLLECTOR THEREOF COUPLED TO THE EMITTER OF SAID FIRST STAGE TRANSISTOR, A PAIR OF SERIES CONNECTED VOLTAGE DIVIDING RESISTORS COUPLED BETWEEN THE COLLECTOR OF THE FIRST STAGE TRANSISTOR AND THE -B LINE OF SAID AMPLIFIER AND THE BASE OF SAID SECOND PROTECTIVE TRANSISTOR BEING CONNECTED TO THE CONNECTION BETWEEN SAID VOLTAGE DIVIDING RESISTORS, AND A SECOND NON-LINEAR RECTIFIER COUPLED BETWEEN THE EMITTER OF SAID SECOND PROTECTIVE TRANSISTOR AND THE -B LINE OF SAID AMPLIFIER.
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) | 1969-10-03 | 1970-04-04 | 1970-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-03 | 1974-04-04 | 1974-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-03 | 1978-04-04 | 1978-10-04 | $7700.00 | Window Closed / Lapsed |