Patent US3658044A successfully refreshed from Google Patents.
US3658044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor discharge ignition system
Assignee: Individual
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Filing: 1970-12-08
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Granted: 1972-04-25
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Expires: 1990-12-08
Abstract
Abstract An improved ignition system is provided for an internal combustion engine which is of the capacitive discharge type, and which serves to maintain the engine in tune for long operational periods; and which also serves to improve combustion within the engine so as to prevent the emission of smog-forming, unburned fuel components at all operational speeds of the vehicle in which the engine is installed. The ignition system of the present invention includes a resistance-capacitance discharge circuit which exhibits a relatively high effective spark energy at low cranking speeds of the engine for cold weather starting, yet which exhibits a lower spark energy at higher engine speeds to prevent undue burning of the sparkplugs.
Inventors
- 👤 Alden L Safstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:20
CPC Classifications
F; F02; F02P; F02P3/00; F02P3/06; F02P3/08; F02P3/0876; F02P3/0884
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
138 words
In an ignition system for an internal combustion engine, and the like, and which includes a source of direct-current voltage, an oscillating inverter for converting the direct-current voltage from said source to a higher direct-current voltage, an ignition coil, first capacitor means connected to said coil, and switching means for alternately causing said first capacitor means to be charged by said inverter and to discharge through said ignition coil at a rate determined by the speed of said internal combustion engine, the combination of: further capacitor means connected in circuit with said first capacitor means for increasing the energy supplied to said ignition coil by said first capacitor means at low cranking engine speeds, and a resistor connected in circuit with said further capacitor means to decrease the effectiveness of said further capacitor means at increased engine speeds.
Claim 2
Dependent Claim
138 words
In an ignition system for an internal combustion engine, and the like, and which includes a source of direct-current voltage, an oscillating inverter for converting the direct-current voltage from said source to a higher direct-current voltage, an ignition coil, first capacitor means connected to said coil, and switching means for alternately causing said first capacitor means to be charged by said inverter and to discharge through said ignition coil at a rate determined by the speed of said internal combustion engine, the combination of: further capacitor means connected in circuit with said first capacitor means for increasing the energy supplied to said ignition coil by said first capacitor means at low cranking engine speeds, and a resistor connected in circuit with said further capacitor means to decrease the effectiveness of said further capacitor means at increased engine speeds.
Claim 3
Dependent Claim
26 words
The combination defined in claim 1, in which said further capacitor means and said resistance means are series connected in shunt with said first capacitor means.
Claim 4
Dependent Claim
19 words
The combination defined in claim 1, and which includes diode means connected in series with said further capacitor means.
Claim 5
Dependent Claim
18 words
The combination defined in claim 2, and which includes diode means connected in shunt with said resistance means.
Claim 6
Dependent Claim
34 words
The combination defined in claim 1, in which said further capacitor means and said resistance means are connected in shunt with one another, and are connected across a portion of the aforesaid ignition coil.
Claim 7
Dependent Claim
17 words
The combination defined in claim 5, and which includes diode means in series with said capacitor means.
Claim 8
Dependent Claim
48 words
The combination defined in claim 1, in which said inverter means includes a multivibrator circuit having first and second transistors and an inverter transformer, and which includes first and second diodes connected in circuit with one of said transistors to provide low voltage operation for the multivibrator circuit.
Claim 9
Dependent Claim
15 words
The combination defined in claim 7, in which said transistors are of a silicon type.
Claim 10
Dependent Claim
16 words
The combination defined in claim 1, in which said switching means comprises a silicon controlled rectifier.
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |