US4308487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual internal electric spark plug
Assignee: Individual
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Filing: 1980-01-30
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Granted: 1981-12-29
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Expires: 2000-01-30
Abstract
Abstract A spark plug for an internal combustion engine; the plug including a pair of electrodes spaced alongside each other, and extending through an insulator fitted in a metal casing that is threaded, so as to be screwed into the engine, each electrode being intercepted by a solid state H.V. time delay device, which, in one example thereof, may comprise a high voltage diode, and, in another example, may comprise a solid state semi-conductor or the like.
Inventors
- 👤 James L. Feaster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:18
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/20; H01T13/22; H01T13/46; H01T13/467
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
121 words
An improved dual internal electric spark plug, comprising, in combination, an insulator, a casing around said insulator, means for attaching said casing to an engine cylinder head, and a pair of electrodes through said insulator, one protruding end of said electrodes being designed for connection to electric wiring connectors, and opposite protruding ends comprising positive contacts respective to substantially "L" shaped anvil negative contacts formed on said casing, and each of said electrodes being interrupted by solid state H.V. time delay devices; a plurality of said time delay devices being circularly arranged and extending axially in a rotatable barrel inside said insulator, so that said time delay devices are selectively aligned between adjacent ends of each said electrode for preferred use.
Claim 2
Dependent Claim
121 words
An improved dual internal electric spark plug, comprising, in combination, an insulator, a casing around said insulator, means for attaching said casing to an engine cylinder head, and a pair of electrodes through said insulator, one protruding end of said electrodes being designed for connection to electric wiring connectors, and opposite protruding ends comprising positive contacts respective to substantially "L" shaped anvil negative contacts formed on said casing, and each of said electrodes being interrupted by solid state H.V. time delay devices; a plurality of said time delay devices being circularly arranged and extending axially in a rotatable barrel inside said insulator, so that said time delay devices are selectively aligned between adjacent ends of each said electrode for preferred use.
Claim 3
Dependent Claim
18 words
The combination as set forth in claim 1, wherein said time delay devices are of different delay intervals.
Claim 4
Dependent Claim
26 words
The combination as set forth in claim 2, wherein said delay devices comprise a plurality of diodes arranged for either a negative or a positive system.
Claim 5
Dependent Claim
24 words
The combination as set forth in claim 3, wherein said diodes are arranged alike, so as to prevent a flash back across said electrodes.
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) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |