Patent US3595212A successfully refreshed from Google Patents.
US3595212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sparking circuit for an ignition system for internal combustion engines
Assignee: Rolls Royce PLC
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Filing: 1969-02-17
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Granted: 1971-07-27
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Expires: 1989-02-17
Abstract
Abstract The invention concerns a sparking circuit for an ignition system for internal combustion engines comprising first and second discharge circuits, the first circuit being operatively associated with said second circuit via delay circuit means, discharge of the first circuit causing said second circuit to discharge after said first circuit but at less than 1 millisecond thereafter.
Inventors
- 👤 Leslie Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:44
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/06; F02P3/08; F02C; F02C7/00; F02C7/26; F02C7/264; F02C7/266; H; H01; H01R; H01R39/00; H01R39/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
162 words
A sparking circuit for use in the ignition system of an internal combustion engine, said circuit comprising: a first discharge circuit means for producing a leader spark used to blast liquid fuel away from sparking electrodes in a combustion chamber of said engine, a second discharge circuit means for producing a main spark used to ignite fuel in said chamber while it is set in motion by said leader spark thereby setting up a travelling flame in said combustion chamber, said first and second discharge circuit means each comprising a rectifier, a condenser and a discharge tube, and a third circuit means including delay means and operatively connected between said first and second circuit means for triggering discharge of said second circuit, after a time delay, from the discharge of said first circuit wherein discharge of said first circuit energizes said third circuit which, in turn, causes said second circuit to discharge between approximately 250 and 750 microseconds after said first circuit.
Claim 2
Dependent Claim
162 words
A sparking circuit for use in the ignition system of an internal combustion engine, said circuit comprising: a first discharge circuit means for producing a leader spark used to blast liquid fuel away from sparking electrodes in a combustion chamber of said engine, a second discharge circuit means for producing a main spark used to ignite fuel in said chamber while it is set in motion by said leader spark thereby setting up a travelling flame in said combustion chamber, said first and second discharge circuit means each comprising a rectifier, a condenser and a discharge tube, and a third circuit means including delay means and operatively connected between said first and second circuit means for triggering discharge of said second circuit, after a time delay, from the discharge of said first circuit wherein discharge of said first circuit energizes said third circuit which, in turn, causes said second circuit to discharge between approximately 250 and 750 microseconds after said first circuit.
Claim 3
Dependent Claim
40 words
A sparking circuit as claimed in claim 1 in which first and second charging means are provided for effecting separate charging of the first and second discharge circuits, whereby, when desired, one only of the said circuits may be charged.
Claim 4
Dependent Claim
29 words
A sparking circuit as claimed in claim 2 in which the first and second charging means are such that the discharge pulses produced thereby are of substantially equal energy.
References Cited (Backward Citations)
US3127540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |