US2591718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark plug
Assignee: Individual
•
Filing: 1950-01-16
•
Granted: 1952-04-08
•
Expires: 1970-01-16
Abstract
No abstract record available.
Inventors
- 👤 Edwin R Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:50
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/46; H01T13/467
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1420159A
Cited
US1528949A
Cited
US2028971A
Cited
US2017364A
Cited
GB536460A
Cited
US2356104A
Cited
US2342360A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |