US2436644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sparking plug
Assignee: WEST ROAD CO Ltd
•
Filing: 1944-04-28
•
Granted: 1948-02-24
•
Expires: 1964-04-28
Abstract
No abstract record available.
Inventors
- 👤 Halstead Philip Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:36
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/20; H01T13/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1927297A
Cited
US2371211A
Cited
US1388373A
Cited
US1745939A
Cited
US1960316A
Cited
US1948382A
Cited
US2301686A
Cited
US2318440A
Cited
US2349432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-02-23 | 1951-08-25 | 1952-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-02-23 | 1955-08-25 | 1956-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-02-23 | 1959-08-25 | 1960-02-24 | $7700.00 | Window Closed / Lapsed |