US2616408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark plug
Assignee: Individual
•
Filing: 1946-12-30
•
Granted: 1952-11-04
•
Expires: 1966-12-30
Abstract
No abstract record available.
Inventors
- 👤 Twells Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:11
CPC Classifications
H; H01; H01T; H01T21/00; H01T21/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2258218A
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US2356104A
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US2389597A
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US2453048A
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US2445777A
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US2464487A
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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) | 1955-11-04 | 1956-05-05 | 1956-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-04 | 1960-05-05 | 1960-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-04 | 1964-05-05 | 1964-11-04 | $7700.00 | Window Closed / Lapsed |