US3603835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark plug with an internal resistor
Assignee: Federal Mogul Ignition LLC
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Filing: 1970-01-14
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Granted: 1971-09-07
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Expires: 1990-01-14
Abstract
Abstract An improved low inductance spring for holding a noise suppression resistor either in the bore of a spark plug insulator or at some other suitable point in the ignition system for an internal combustion engine. The spring is formed from an elongated resilient conductor which is preferably flat. The conductor is shaped to have a plurality of reverse bends which simulate pleats in the bellows of an accordion.
Inventors
- 👤 Carl J Eaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:17
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/40; H01T13/41
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
In a spark plug for an internal combustion engine having an insulator surrounding a center electrode, said electrode being connected to an external terminal by a resistor positioned within the bore of said insulator, a low inductance spring for maintaining electrical contact between said resistor, said electrode and said terminal, said spring comprising an elongated resilient conductor, said conductor having a plurality of reverse bends longitudinally spaced therealong and having a maximum compressed width less than the diameter of the bore of said insulator, said spring being positioned in the bore of said insulator and compressed between said resistor and one of said electrode and said terminal.
Claim 2
Dependent Claim
107 words
In a spark plug for an internal combustion engine having an insulator surrounding a center electrode, said electrode being connected to an external terminal by a resistor positioned within the bore of said insulator, a low inductance spring for maintaining electrical contact between said resistor, said electrode and said terminal, said spring comprising an elongated resilient conductor, said conductor having a plurality of reverse bends longitudinally spaced therealong and having a maximum compressed width less than the diameter of the bore of said insulator, said spring being positioned in the bore of said insulator and compressed between said resistor and one of said electrode and said terminal.
Claim 3
Dependent Claim
24 words
An improved spark plug for an internal combustion engine, as claimed in claim 1, wherein said spring is formed from a flat elongated conductor.
Claim 4
Dependent Claim
56 words
An improved spark plug for an internal combustion engine, as claimed in claim 2, wherein one end of said spring is formed to maintain flat contact with an end of said resistor and the other end of said spring is formed to maintain flat contact with an end of one of said electrode and said terminal.
Claim 5
Dependent Claim
32 words
An improved spark plug for an internal combustion engine, as claimed in claim 2, wherein said reverse bends are substantially uniform and are uniformly spaced along said conductor to resemble accordion pleats.
Claim 6
Dependent Claim
79 words
In an ignition system for an internal combustion engine including a radio interference suppression resistor, an improved low inductance spring for electrically connecting said resistor to a terminal, said spring comprising an elongated resilient conductor, said conductor having a plurality of reverse bends longitudinally spaced therealong to resemble accordion pleats, said spring being compressed between said resistor and said terminal, and the end portions of said spring being formed to maintain flat contact with said resistor and said terminal.
Claim 7
Dependent Claim
79 words
In an ignition system for an internal combustion engine including a radio interference suppression resistor, an improved low inductance spring for electrically connecting said resistor to a terminal, said spring comprising an elongated resilient conductor, said conductor having a plurality of reverse bends longitudinally spaced therealong to resemble accordion pleats, said spring being compressed between said resistor and said terminal, and the end portions of said spring being formed to maintain flat contact with said resistor and said terminal.
Claim 8
Dependent Claim
33 words
A low inductance spring for connecting a suppression resistor in an ignition system for an internal combustion engine, as defined in claim 5, wherein said spring is formed from a flat elongated conductor.
Claim 9
Dependent Claim
36 words
A low inductance spring for connecting a suppression resistor in an ignition system for an internal combustion engine, as defined in claim 5, wherein said reverse bends are substantially uniform and are spaced along said conductor.
References Cited (Backward Citations)
US2723364A
Cited
US3014150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |