US2790104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface discharge spark plug and method for making such a spark plug
Assignee: Smitsvonk N V Res Lab Comp
•
Filing: 1952-01-18
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Granted: 1957-04-23
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Expires: 1972-01-18
Abstract
No abstract record available.
Inventors
- 👤 Smits Wytze Beye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:19
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2578754A
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US1390014A
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US1958580A
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US2176858A
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GB536460A
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US2333749A
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US2356053A
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US2503194A
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US2527489A
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US2608186A
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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) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |