Patent US1390897A successfully refreshed from Google Patents.
US1390897A
Expired / Lapsed
US
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Fuel-saver eor engines
Assignee: —
•
Filing: —
•
Granted: 1921-09-13
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Expires: 1938-09-13
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:02
CPC Classifications
F; F02; F02M; F02M1/00; F02M2700/00; F02M2700/43; F02M2700/4302; F02M2700/4321; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7847; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86734
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1924-09-12 | 1925-03-14 | 1925-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-09-12 | 1929-03-14 | 1929-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-09-12 | 1933-03-14 | 1933-09-13 | $7700.00 | Window Closed / Lapsed |