US3369178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automotive tachometer energized by the ignition primary circuit
Assignee: Bendix Corp
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Filing: 1965-08-26
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Granted: 1968-02-13
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Expires: 1985-08-26
Abstract
No abstract record available.
Inventors
- 👤 George A Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:39
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/4802; G01P3/4807
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A TACHOMETER CIRCUIT FOR INTERNAL COMBUSTION ENGINES WITH ELECTRICAL SPARK IGNITION SYSTEMS HAVING AN INDUCTION COIL AND BREAKER POINTS DRIVEN SYNCHRONOUSLY BY THE ENGINE FOR INTERRUPTING PRIMARY CURRENT TO THE COIL, COMPRISING, AN INPUT TRANSFORMER WITH STEPUP TURNS RATIO BETWEEN THE PRIMARY AND SECONDARY WINDINGS THEREOF, THE PRIMARY WINDING OF SAID TRANSFORMER BEING CONNECTED IN SERIES WITH THE PRIMARY CIRCUIT OF THE IGNITION SYSTEM COIL; A LOAD RESISTOR CONNECTED TO THE SECONDARY WINDING OF SAID TRANSFORMER; A TRANSISTOR HAVING BASE, EMITTER AND COLLECTOR ELECTRODES, SAND BASE AND EMITTER ELECTRODES BEING IN SERIES CIRCUIT WITH SAID LOAD RESISTOR ACROSS SAID TRANSFORMER SECONDARY WINDING; A DIODE HAVING ONE ELECTRODE THEREOF CONNECTED TO THE EMITTER OF SAID TRANSISTOR; A METER CONNECTED TO THE OTHER ELECTRODE OF SAID DIODE AND TO THE COLLECTOR OF SAID TRANSISTOR; AND A CAPACITOR CONNECTED BETWEEN THE BASE OF SAID TRANSISTOR AND SAID OTHER ELECTRODE OF SAID DIODE.
Claim 2
Dependent Claim
149 words
A TACHOMETER CIRCUIT FOR INTERNAL COMBUSTION ENGINES WITH ELECTRICAL SPARK IGNITION SYSTEMS HAVING AN INDUCTION COIL AND BREAKER POINTS DRIVEN SYNCHRONOUSLY BY THE ENGINE FOR INTERRUPTING PRIMARY CURRENT TO THE COIL, COMPRISING, AN INPUT TRANSFORMER WITH STEPUP TURNS RATIO BETWEEN THE PRIMARY AND SECONDARY WINDINGS THEREOF, THE PRIMARY WINDING OF SAID TRANSFORMER BEING CONNECTED IN SERIES WITH THE PRIMARY CIRCUIT OF THE IGNITION SYSTEM COIL; A LOAD RESISTOR CONNECTED TO THE SECONDARY WINDING OF SAID TRANSFORMER; A TRANSISTOR HAVING BASE, EMITTER AND COLLECTOR ELECTRODES, SAND BASE AND EMITTER ELECTRODES BEING IN SERIES CIRCUIT WITH SAID LOAD RESISTOR ACROSS SAID TRANSFORMER SECONDARY WINDING; A DIODE HAVING ONE ELECTRODE THEREOF CONNECTED TO THE EMITTER OF SAID TRANSISTOR; A METER CONNECTED TO THE OTHER ELECTRODE OF SAID DIODE AND TO THE COLLECTOR OF SAID TRANSISTOR; AND A CAPACITOR CONNECTED BETWEEN THE BASE OF SAID TRANSISTOR AND SAID OTHER ELECTRODE OF SAID DIODE.
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) | 1971-02-12 | 1971-08-14 | 1972-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-12 | 1975-08-14 | 1976-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-12 | 1979-08-14 | 1980-02-13 | $7700.00 | Window Closed / Lapsed |