Patent US2972077A successfully refreshed from Google Patents.
US2972077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition system and spark plug
Assignee: —
•
Filing: —
•
Granted: 1961-02-14
•
Expires: 1978-02-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:28
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/46; H01T13/462; G; G01; G01L; G01L23/00; G01L23/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2474550A
Cited
US1477119A
Cited
US1589489A
Cited
US2490960A
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US2436905A
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US1020503A
Cited
US1484591A
Cited
US1963302A
Cited
GB388952A
Cited
US2125035A
Cited
US2283164A
Cited
US2470413A
Cited
US2442945A
Cited
US2589164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-14 | 1964-08-15 | 1965-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-14 | 1968-08-15 | 1969-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-14 | 1972-08-15 | 1973-02-14 | $7700.00 | Window Closed / Lapsed |