Patent US3112431A successfully refreshed from Google Patents.
US3112431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor switch
Assignee: MODUTRONICS Inc
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Filing: 1961-10-19
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Granted: 1963-11-26
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Expires: 1981-10-19
Abstract
No abstract record available.
Inventors
- 👤 Helmer T Pederson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:51
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/30; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/284
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
212 words
A TRANSISTOR SWITCHING CIRCUIT WHICH COMPRISES D.C. INPUT CONDUCTOR MEANS INCLUDING A RELATIVELY HIGH VOLTAGE CONDUCTOR AND A RELATIVELY LOW VOLTAGE CONDUCTOR, A SWITCHING TRANSISTOR AND AN AMPLIFIER TRANSISTOR, THE COLLECTOR OF THE SWITCHING TRANSISTOR BEING ELECTRICALLY CONNECTED TO THE EMITTER OF THE AMPLIFIER TRANSISTOR, AN ELECTRICAL CONNECTION INCLUDING A BASE RESISTOR BETWEEN ONE CONDUCTOR AND THE BASE OF SAID SWITCHING TRANSISTOR, AN ELECTRICAL CONNECTION INCLUDING A BASE RESISTOR BETWEEN THE OTHER CONDUCTOR AND THE BASE OF SAID AMPLIFIER TRANSISTOR, BIASING MEANS CONNECTED BETWEEN SAID ONE CONDUCTOR AND THE SWITCHING TRANSISTOR EMITTER FOR PROVIDING CUTOFF BIAS TO THE SWITCHING TRANSISTOR, CIRCUIT MEANS CONNECTED TO THE SWITCHING TRANSISTOR EMITTER AND TO THE AMPLIFIER TRANSISTOR BASE FOR ESTABLISHING A VOLTAGE BETWEEN THE SWITCHING TRANSISTOR EMITTER AND THE AMPLIFIER TRANSISTOR BASE AT LEAST AS LARGE AS THE SWITCHING TRANSISTOR SATURATION VOLTAGE, AND OUTPUT CIRCUIT MEANS ELECTRICALLY CONNECTED BETWEEN THE COLLECTOR OF SAID AMPLIFIER TRANSISTOR AND SAID OTHER CONDUCTOR, WHEREBY THE SWITCHING TRANSISTOR WILL NORMALLY BE IN A NON-CONDUCTING STATE AND WILL NOT PROVIDE CURRENT TO THE AMPLIFIER TRANSISTOR, AND THE APPLICATION OF A SIGNAL TO THE SWITCHING TRANSISTOR BASE WHICH OVERCOMES THE SWITCHING TRANSISTOR BIASING VOLTAGE WILL SHARPLY SWITCH THE SWITCHING TRANSISTOR TO SATURATION CURRENT FLOW SO AS TO PROVIDE CURRENT TO THE AMPLIFIER TRANSISTOR.
Claim 2
Dependent Claim
212 words
A TRANSISTOR SWITCHING CIRCUIT WHICH COMPRISES D.C. INPUT CONDUCTOR MEANS INCLUDING A RELATIVELY HIGH VOLTAGE CONDUCTOR AND A RELATIVELY LOW VOLTAGE CONDUCTOR, A SWITCHING TRANSISTOR AND AN AMPLIFIER TRANSISTOR, THE COLLECTOR OF THE SWITCHING TRANSISTOR BEING ELECTRICALLY CONNECTED TO THE EMITTER OF THE AMPLIFIER TRANSISTOR, AN ELECTRICAL CONNECTION INCLUDING A BASE RESISTOR BETWEEN ONE CONDUCTOR AND THE BASE OF SAID SWITCHING TRANSISTOR, AN ELECTRICAL CONNECTION INCLUDING A BASE RESISTOR BETWEEN THE OTHER CONDUCTOR AND THE BASE OF SAID AMPLIFIER TRANSISTOR, BIASING MEANS CONNECTED BETWEEN SAID ONE CONDUCTOR AND THE SWITCHING TRANSISTOR EMITTER FOR PROVIDING CUTOFF BIAS TO THE SWITCHING TRANSISTOR, CIRCUIT MEANS CONNECTED TO THE SWITCHING TRANSISTOR EMITTER AND TO THE AMPLIFIER TRANSISTOR BASE FOR ESTABLISHING A VOLTAGE BETWEEN THE SWITCHING TRANSISTOR EMITTER AND THE AMPLIFIER TRANSISTOR BASE AT LEAST AS LARGE AS THE SWITCHING TRANSISTOR SATURATION VOLTAGE, AND OUTPUT CIRCUIT MEANS ELECTRICALLY CONNECTED BETWEEN THE COLLECTOR OF SAID AMPLIFIER TRANSISTOR AND SAID OTHER CONDUCTOR, WHEREBY THE SWITCHING TRANSISTOR WILL NORMALLY BE IN A NON-CONDUCTING STATE AND WILL NOT PROVIDE CURRENT TO THE AMPLIFIER TRANSISTOR, AND THE APPLICATION OF A SIGNAL TO THE SWITCHING TRANSISTOR BASE WHICH OVERCOMES THE SWITCHING TRANSISTOR BIASING VOLTAGE WILL SHARPLY SWITCH THE SWITCHING TRANSISTOR TO SATURATION CURRENT FLOW SO AS TO PROVIDE CURRENT TO THE AMPLIFIER TRANSISTOR.
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) | 1966-11-25 | 1967-05-27 | 1967-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-25 | 1971-05-27 | 1971-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-25 | 1975-05-27 | 1975-11-26 | $7700.00 | Window Closed / Lapsed |