US2638565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric spark ignition apparatus for internal-combustion engines
Assignee: ZF International UK Ltd
•
Filing: 1950-01-24
•
Granted: 1953-05-12
•
Expires: 1970-01-24
Abstract
No abstract record available.
Inventors
- 👤 Laird John Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:33
CPC Classifications
F; F02; F02P; F02P7/00; F02P7/02; F02P7/021; F02P7/026; F02P7/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2489780A
Cited
US2507277A
Cited
US1246822A
Cited
US1418518A
Cited
US1907515A
Cited
US2163055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |