US2687713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface arc antechamber spark plug
Assignee: Boeing Co
•
Filing: 1951-08-14
•
Granted: 1954-08-31
•
Expires: 1971-08-14
Abstract
No abstract record available.
Inventors
- 👤 Gilbert F Wright
- 👤 Gaylord W Newton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:31
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB464179A
Cited
US950847A
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US1359591A
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US1531130A
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US1457389A
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US1451677A
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US1547978A
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US2519273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |