Patent US2578439A successfully refreshed from Google Patents.
US2578439A
Expired / Lapsed
US
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Balanced double-acting engine
Assignee: MOORE Inc
•
Filing: 1947-08-06
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Granted: 1951-12-11
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Expires: 1967-08-06
Abstract
No abstract record available.
Inventors
- 👤 Mercier Ernest Frederic
- 👤 Mercier Pierre Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:57
CPC Classifications
F; F02; F02B; F02B71/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL53936C
Cited
US1230219A
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US2115921A
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US2139425A
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US2147935A
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US2244215A
Cited
US2241957A
Cited
FR855700A
Cited
US2510127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-10 | 1955-06-11 | 1955-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-10 | 1959-06-11 | 1959-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-10 | 1963-06-11 | 1963-12-11 | $7700.00 | Window Closed / Lapsed |