US2521647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spark plug
Assignee: Bendix Aviation Corp
•
Filing: 1945-08-09
•
Granted: 1950-09-05
•
Expires: 1965-08-09
Abstract
No abstract record available.
Inventors
- 👤 Operhall Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:33
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/20; H01T13/36; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/49917; Y10T29/49918
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1141052A
Cited
US1156799A
Cited
GB162868A
Cited
US1514209A
Cited
US1685059A
Cited
US1842833A
Cited
US2301686A
Cited
US2312909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |