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Patent US2672729A successfully refreshed from Google Patents.
US2672729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark plug
Assignee: Boeing Co
•
Filing: 1950-10-28
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Granted: 1954-03-23
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Expires: 1970-10-28
Abstract
No abstract record available.
Inventors
- 👤 William H Van Ry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:46
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/26; F02C7/264; F02C7/266
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1694001A
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US1784541A
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US2162572A
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US2404335A
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US2385833A
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US2508260A
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US2578501A
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US2526169A
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US2493743A
Cited
US2543366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |