US3913549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inductor current relay switch
Assignee: V 8 ELECTRONIC IGNITION CO
•
Filing: 1973-09-20
•
Granted: 1975-10-21
•
Expires: 1993-09-20
Abstract
Abstract An inductor relay switch ignition system for an internal combustion engine. One side of the primary coil forming part of the ignition coil for the system is connected to a source of D.C. potential, and the second side of the coil is connected to ground through a pair of parallel transistor-switched paths. The first of these paths includes the ignition breaker points; the second path is of lower impedance than the first, and is enabled by current flowing through the first path, thereby providing a relay action. In order to prevent inductive kick back from damaging the switching transistors, the second side of the coil is connected to ground through a potential limiting means, such as a zener diode.
Inventors
- 👤 Peter G Crisafulli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:00
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/02; F02P3/04; F02P3/055; F02P3/0552
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
An inductor relay switch ignition system for an internal combustion engine, comprising in combination: a primary coil forming part of an ignition coil for said system; a source of D.C. potential having one side thereof connected to one side of said primary coil, and the other side thereof grounded; a pair of parallel transistor-switched conducting paths connecting the second side of said primary coil to ground, said first path including the ignition breaker points of said ignition system, and said second path being of lower impedance than said first path; said second conductiVe path being enabled by current flowing through said first path, thereby providing a relay action and a relatively low impedance path to ground shunting said breaker points; and a potential limiting means connected between said second side of said primary coil and ground to prevent inductive kick back from damaging said transistors.
Claim 2
Dependent Claim
145 words
An inductor relay switch ignition system for an internal combustion engine, comprising in combination: a primary coil forming part of an ignition coil for said system; a source of D.C. potential having one side thereof connected to one side of said primary coil, and the other side thereof grounded; a pair of parallel transistor-switched conducting paths connecting the second side of said primary coil to ground, said first path including the ignition breaker points of said ignition system, and said second path being of lower impedance than said first path; said second conductiVe path being enabled by current flowing through said first path, thereby providing a relay action and a relatively low impedance path to ground shunting said breaker points; and a potential limiting means connected between said second side of said primary coil and ground to prevent inductive kick back from damaging said transistors.
Claim 3
Dependent Claim
16 words
A system in accordance with claim 1, wherein said potential limiting means comprises a zener diode.
Claim 4
Dependent Claim
32 words
A system in accordance with claim 2, further including a neon discharge lamp in parallel with said zener diode, for providing additional limitation of said potential and visual indication of system operation.
Claim 5
Dependent Claim
15 words
A system in accordance with claim 1, wherein said potential limiting means comprises a capacitor.
Claim 6
Dependent Claim
33 words
A system in accordance with claim 2, further including a neon discharge lamp connected across said primary coil, for further controlling said inductive kick back, and for providing visual indication of system operation.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |