US2630871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus for tandem engines
Assignee: Individual
•
Filing: 1951-03-01
•
Granted: 1953-03-10
•
Expires: 1971-03-01
Abstract
No abstract record available.
Inventors
- 👤 Isaac W Simpkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:03
CPC Classifications
F; F02; F02D; F02D25/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1768530A
Cited
US2062824A
Cited
US2140109A
Cited
US2161153A
Cited
US2235175A
Cited
US2545458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-09 | 1956-09-08 | 1957-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-09 | 1960-09-08 | 1961-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-09 | 1964-09-08 | 1965-03-10 | $7700.00 | Window Closed / Lapsed |