US3305791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fault detecting and switching circuit for providing reliability in amplifier circuits
Assignee: Allard Way Holdings Ltd
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Filing: 1964-03-09
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Granted: 1967-02-21
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Expires: 1984-03-09
Abstract
No abstract record available.
Inventors
- 👤 Wolfe Brian Sinclair
- 👤 Gilbert Malcolm Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:00
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03F1/54; H03F1/542; H03F1/526; H04; H04B; H04B1/00; H04B1/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
ELECTRONIC EQUIPMENT COMPRISING TWO SIMILAR COMPONENTS ARRANGED FOR CONNECTION ALTERNATIVELY IN A SIGNAL CIRCUIT, SWITCHING MEANS IN SAID SIGNAL CIRCUIT OPERABLE TO EFFECT SAID ALTERNATIVE CONNECTION, CIRCUIT MEANS COUPLED TO ONLY ONE OF SAID COMPONENTS AND OPERATIVE ON FAILURE THEREOF TO ACTUATE SAID SWITCHING MEANS TO CONNECT THE OTHER SAID COMPONENT INTO THE CIRCUIT, SAID ONE COMPONENT COMPRISING A FIRST TRANSISTOR WITH BASE, EMITTER AND COLLECTOR ELECTRODES AND SAID CIRCUIT MEANS COMPRISING A SECOND TRANSISTOR AND A ZENER DIODE CONNECTED TOGETHER IN COMBINATION, WHICH COMBINATION HAS TWO INPUT TERMINALS CONNECTED RESPECTIVELY TO TWO ELECTRODES OF THE FIRST TRANSISTOR, THE ZENER DIODE HAVING ONE SIDE CONNECTED TO ONE OF SAID INPUT TERMINALS AND SAID CIRCUIT MEANS FURTHER COMPRISING A SERIES RESISTOR TO WHICH THE OTHER SIDE OF THE ZENER DIODE IS CONNECTED AND MEANS CONNECTING THE JUNCTION OF THE ZENER DIODE AND THE SERIES RESISTOR TO ONE INPUT ELECTRODE OF THE SECOND TRANSISTOR, MEANS CONNECTING THE OTHER INPUT ELECTRODE OF THE SECOND TRANSISTOR TO THE OTHER INPUT TERMINAL, BREAKDOWN CONDUCTION OF THE ZENER DIODE BEING CONTROLLED BY THE POTENTIAL DIFFERENCE BETWEEN SAID
Claim 2
Dependent Claim
181 words
ELECTRONIC EQUIPMENT COMPRISING TWO SIMILAR COMPONENTS ARRANGED FOR CONNECTION ALTERNATIVELY IN A SIGNAL CIRCUIT, SWITCHING MEANS IN SAID SIGNAL CIRCUIT OPERABLE TO EFFECT SAID ALTERNATIVE CONNECTION, CIRCUIT MEANS COUPLED TO ONLY ONE OF SAID COMPONENTS AND OPERATIVE ON FAILURE THEREOF TO ACTUATE SAID SWITCHING MEANS TO CONNECT THE OTHER SAID COMPONENT INTO THE CIRCUIT, SAID ONE COMPONENT COMPRISING A FIRST TRANSISTOR WITH BASE, EMITTER AND COLLECTOR ELECTRODES AND SAID CIRCUIT MEANS COMPRISING A SECOND TRANSISTOR AND A ZENER DIODE CONNECTED TOGETHER IN COMBINATION, WHICH COMBINATION HAS TWO INPUT TERMINALS CONNECTED RESPECTIVELY TO TWO ELECTRODES OF THE FIRST TRANSISTOR, THE ZENER DIODE HAVING ONE SIDE CONNECTED TO ONE OF SAID INPUT TERMINALS AND SAID CIRCUIT MEANS FURTHER COMPRISING A SERIES RESISTOR TO WHICH THE OTHER SIDE OF THE ZENER DIODE IS CONNECTED AND MEANS CONNECTING THE JUNCTION OF THE ZENER DIODE AND THE SERIES RESISTOR TO ONE INPUT ELECTRODE OF THE SECOND TRANSISTOR, MEANS CONNECTING THE OTHER INPUT ELECTRODE OF THE SECOND TRANSISTOR TO THE OTHER INPUT TERMINAL, BREAKDOWN CONDUCTION OF THE ZENER DIODE BEING CONTROLLED BY THE POTENTIAL DIFFERENCE BETWEEN SAID
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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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |