US4384256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diagnostic ignition spark detector
Assignee: Individual
•
Filing: 1981-03-18
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Granted: 1983-05-17
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Expires: 2001-03-18
Abstract
Abstract A device used to visually detect the presence of a spark in internal combustion engines employing one or more spark plugs without removing the spark plug from the engine block.
Inventors
- 👤 Ronald J. Di Monte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:09
CPC Classifications
F; F02; F02P; F02P17/00; F02P17/12; H; H01; H01T; H01T13/00; H01T13/48
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
188 words
A diagnostic ignition spark detector in an internal combustion engine comprising a spark plug, hollow means for spacedly enveloping said spark plug, an upper hollow member, said means depending from said upper member, upper and lower partial walls on said upper member, a cap extending upwardly from said lower wall, a sleeve extending upwardly from said lower wall adjacent said cap, a sleeve depending from said upper wall, an elongated heated screw frictionally disposed in said depending sleeve, the head of said screw extending above said sleeve and the lower end extending below said sleeve, a metal cap frictionally encompassing the head of said screw, a portion of said screw extending below said sleeve, an expanded metal coiled spring surrounding said spark plug with the lower end grounded on the metal portion of said plug, the upper end of said spring being bent at right angles and frictionally seated in said upstanding sleeve, the free end of said upper end of said spring being bent at right angles, flattened and positioned directly below the lower end of said screw, and a viewing window in said upper hollow member.
Claim 2
Dependent Claim
188 words
A diagnostic ignition spark detector in an internal combustion engine comprising a spark plug, hollow means for spacedly enveloping said spark plug, an upper hollow member, said means depending from said upper member, upper and lower partial walls on said upper member, a cap extending upwardly from said lower wall, a sleeve extending upwardly from said lower wall adjacent said cap, a sleeve depending from said upper wall, an elongated heated screw frictionally disposed in said depending sleeve, the head of said screw extending above said sleeve and the lower end extending below said sleeve, a metal cap frictionally encompassing the head of said screw, a portion of said screw extending below said sleeve, an expanded metal coiled spring surrounding said spark plug with the lower end grounded on the metal portion of said plug, the upper end of said spring being bent at right angles and frictionally seated in said upstanding sleeve, the free end of said upper end of said spring being bent at right angles, flattened and positioned directly below the lower end of said screw, and a viewing window in said upper hollow member.
Claim 3
Dependent Claim
33 words
The device according to claim 1 wherein said means to envelop said spark plug, said upper member, said sleeves and said cap extending upwardly from said lower wall is constructed of insulating material.
Claim 4
Dependent Claim
16 words
The device according to claim 1 wherein the lower end of said screw is tapered downwardly.
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) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |