US3176159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching circuit
Assignee: ZF International UK Ltd
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Filing: 1962-09-10
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Granted: 1965-03-30
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Expires: 1982-09-10
Abstract
No abstract record available.
Inventors
- 👤 Laishley Frederick Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:18
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/73; H02; H02M; H02M1/00; H02M1/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
211 words
A SWITCHING CIRCUIT COMPRISING IN COMBINATION FIRST AND SECOND TERMINALS FOR CONNECTING TO A D.C. SOURCE SO AS TO BE OF RELATIVELY POSITIVE AND NEGATIVE POLARITIES RESPECTIVELY, A FIRST CONTROLLED RECTIFIER HAVING ITS ANODE CONNECTED TO THE FIRST TERMINAL AND ITS CATHODE CONNECTED TO THE SECOND TERMINAL THROUGH A FIRST RESISTOR, A SECOND CONTROLLED RECTIFIER HAVING ITS ANODE CONNECTED TO THE FIRST TERMINAL THROUGH A SECOND RESISTOR AND ITS CATHODE CONNECTED TO THE SECOND TERMINAL THROUGH THE FIRST RESISTOR, A CAPACITOR CONNECTED BETWEEN THE SECOND TERMINAL AND THE ANODE OF THE SECOND CONTROLLED RECTIFIER, AND A THIRD RESISTOR AND A ZENER DIODE CONNECTED IN SERIES BETWEEN THE CATHODE OF THE SECOND CONTROLLED RECTIFIER AND THE SECOND TERMINAL, THE ARRANGEMENT BEING SUCH THAT IN USE A VOLTAGE SUPPLIED TO THE GATE OF THE FIRST CONTROLLED RECTIFIER WILL RENDER IT CONDUCTIVE, WHEREAFTER A VOLTAGE SUPPLIED TO THE SECOND CONTROLLED RECTIFIER WILL RENDER IT CONDUCTIVE, AND ALLOW THE CAPACITOR TO DISCHARGE THROUGH THE FIRST RESISTOR AND THEREBY REDUCE THE ANODE-CATHODE VOLTAGE OF THE FIRST CONTROLLED RECTIFIER SUFFICIENTLY TO SWITCH IT OFF, THE VALUE OF THE SECOND RESISTOR BEING CHOSEN SO THAT WHEN THE CAPACITOR HAS DISCHARGED THE CURRENT THROUGH THE SECOND CONTROLLED RECTIFIER IS REDUCED TO A VALUE SUCH THAT IT IS SWITCHED OFF.
Claim 2
Dependent Claim
211 words
A SWITCHING CIRCUIT COMPRISING IN COMBINATION FIRST AND SECOND TERMINALS FOR CONNECTING TO A D.C. SOURCE SO AS TO BE OF RELATIVELY POSITIVE AND NEGATIVE POLARITIES RESPECTIVELY, A FIRST CONTROLLED RECTIFIER HAVING ITS ANODE CONNECTED TO THE FIRST TERMINAL AND ITS CATHODE CONNECTED TO THE SECOND TERMINAL THROUGH A FIRST RESISTOR, A SECOND CONTROLLED RECTIFIER HAVING ITS ANODE CONNECTED TO THE FIRST TERMINAL THROUGH A SECOND RESISTOR AND ITS CATHODE CONNECTED TO THE SECOND TERMINAL THROUGH THE FIRST RESISTOR, A CAPACITOR CONNECTED BETWEEN THE SECOND TERMINAL AND THE ANODE OF THE SECOND CONTROLLED RECTIFIER, AND A THIRD RESISTOR AND A ZENER DIODE CONNECTED IN SERIES BETWEEN THE CATHODE OF THE SECOND CONTROLLED RECTIFIER AND THE SECOND TERMINAL, THE ARRANGEMENT BEING SUCH THAT IN USE A VOLTAGE SUPPLIED TO THE GATE OF THE FIRST CONTROLLED RECTIFIER WILL RENDER IT CONDUCTIVE, WHEREAFTER A VOLTAGE SUPPLIED TO THE SECOND CONTROLLED RECTIFIER WILL RENDER IT CONDUCTIVE, AND ALLOW THE CAPACITOR TO DISCHARGE THROUGH THE FIRST RESISTOR AND THEREBY REDUCE THE ANODE-CATHODE VOLTAGE OF THE FIRST CONTROLLED RECTIFIER SUFFICIENTLY TO SWITCH IT OFF, THE VALUE OF THE SECOND RESISTOR BEING CHOSEN SO THAT WHEN THE CAPACITOR HAS DISCHARGED THE CURRENT THROUGH THE SECOND CONTROLLED RECTIFIER IS REDUCED TO A VALUE SUCH THAT IT IS SWITCHED OFF.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |