US2633116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shielded spark plug
Assignee: LEONARD SPARK PLUG CO Inc
•
Filing: 1949-11-02
•
Granted: 1953-03-31
•
Expires: 1969-11-02
Abstract
No abstract record available.
Inventors
- 👤 Ingram Maxwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:57
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/02; H01T13/04; H01T13/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1930322A
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US1759997A
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US1927267A
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US2113735A
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US2356053A
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US2355166A
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US2309236A
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US2368889A
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US2399390A
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US2391457A
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US2391459A
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US2463924A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |