US2685872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark plug with improved insulator means
Assignee: CHARLES V HOKE
•
Filing: 1951-11-19
•
Granted: 1954-08-10
•
Expires: 1971-11-19
Abstract
No abstract record available.
Inventors
- 👤 Francis E Berstler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:21
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/20; H01T13/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US927704A
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US898427A
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US1225467A
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US1337679A
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US1801023A
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US2053369A
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US2368889A
Cited
US2351543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-09 | 1958-02-08 | 1958-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-09 | 1962-02-08 | 1962-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-09 | 1966-02-08 | 1966-08-10 | $7700.00 | Window Closed / Lapsed |