US3958144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark plug
Assignee: Individual
•
Filing: 1974-11-22
•
Granted: 1976-05-18
•
Expires: 1994-11-22
Abstract
Abstract Spark plugs having electrodes formed from combinations in defined proportions of tungsten, vanadium, depleted uranium, rhodium, iridium, palladium, nickel, chromium, copper, barium aluminate, iron, and thoria. Various advantageous electrode configurations are described, as well as methods of constructing the spark plugs.
Inventors
- 👤 Harry E. Franks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:24
CPC Classifications
H; H01; H01T; H01T21/00; H01T21/02; H01T13/00; H01T13/02; H01T13/14; H01T13/20; H01T13/39; H01T13/46; H01T13/467; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12944
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
98 words
A spark plug comprising a mounting body and outer and inner electrodes carried by said body extending forwardly therefrom and separated from each other by a space constituting a spark gap, said outer electrode having an inner surface of revolution opposing said inner electrode across said spark gap, said inner electrode having an outer surface parallel to the opposing surface of said outer electrode to provide a large number of alternate sparking paths through said gap; both of said electrode surfaces being formed of an alloy consisting of 75% nickel, 15% chromium, 5% iron, and the remainder copper.
Claim 2
Dependent Claim
98 words
A spark plug comprising a mounting body and outer and inner electrodes carried by said body extending forwardly therefrom and separated from each other by a space constituting a spark gap, said outer electrode having an inner surface of revolution opposing said inner electrode across said spark gap, said inner electrode having an outer surface parallel to the opposing surface of said outer electrode to provide a large number of alternate sparking paths through said gap; both of said electrode surfaces being formed of an alloy consisting of 75% nickel, 15% chromium, 5% iron, and the remainder copper.
Claim 3
Dependent Claim
18 words
A spark plug as claimed in claim 1 in which said surface of revolution is cylindrical and concave.
References Cited (Backward Citations)
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US2217825A
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US3356882A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |