Patent US3835830A successfully refreshed from Google Patents.
US3835830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark ignition systems
Assignee: Plessey Handel und Investments AG
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Filing: 1972-08-14
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Granted: 1974-09-17
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Expires: 1992-08-14
Abstract
Abstract A spark generator or ignition system in which an arc is struck by applying an E.H.T. voltage pulse, of some thousands of volts, across a spark gap, and maintaining the spark by the current from the discharge of a capacitor charged only to an H.T. voltage (typically 400v), which produces spark intensifying energy.
Inventors
- 👤 R Shepherd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:22
CPC Classifications
F; F02; F02P; F02P1/00; F02P1/08; F02P1/086; F02P9/00; F02P9/002; F02P9/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
203 words
An internal combustion engine ignition system comprising a winding, a storage capacitor, rectifier means through which the said storage capacitor is charged by a current of one sense induced in the said winding by relative rotation between the said winding and a magnet operatively associated with the said engine, a thyristor responsive to a trigger pulse induced in the said winding by the said magnet and of opposite sense to the said current, the said trigger pluse beinG effective for rendering conductive the said thyristor so that the said capacitor is discharged through the primary winding of an ignition transformer thereby to produce an ignition pulse in the secondary winding of the said ignition transformer for application to a spark gap of the said engine and a further storage capacitor and further rectifier means coupled to the said secondary winding so that in operation of the system the said further capacitor charges contemporaneously with the said storage capacitor through the said further rectifier means and discharges through the said secondary winding of the said ignition transformer consequent upon production of the said ignition pulse thereby to provide current which increases the intensity of the said ignition pulse applied to the said spark gap.
Claim 2
Dependent Claim
203 words
An internal combustion engine ignition system comprising a winding, a storage capacitor, rectifier means through which the said storage capacitor is charged by a current of one sense induced in the said winding by relative rotation between the said winding and a magnet operatively associated with the said engine, a thyristor responsive to a trigger pulse induced in the said winding by the said magnet and of opposite sense to the said current, the said trigger pluse beinG effective for rendering conductive the said thyristor so that the said capacitor is discharged through the primary winding of an ignition transformer thereby to produce an ignition pulse in the secondary winding of the said ignition transformer for application to a spark gap of the said engine and a further storage capacitor and further rectifier means coupled to the said secondary winding so that in operation of the system the said further capacitor charges contemporaneously with the said storage capacitor through the said further rectifier means and discharges through the said secondary winding of the said ignition transformer consequent upon production of the said ignition pulse thereby to provide current which increases the intensity of the said ignition pulse applied to the said spark gap.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |