US2645897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reciprocating internal-combustion engine operating on the two-stroke cycle with exhaust turbine
Assignee: Napier Turbochargers Ltd
•
Filing: 1950-04-03
•
Granted: 1953-07-21
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Expires: 1970-04-03
Abstract
No abstract record available.
Inventors
- 👤 Sammons Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:13
CPC Classifications
F; F02; F02B; F02B37/00; F02B37/04; F02B37/10; F02B37/105; F02B37/013; F02B39/00; F02B39/02; F02B39/08; F02B67/00; F02B67/10; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR684902A
Cited
US1814802A
Cited
US1919572A
Cited
US2085270A
Cited
US2168726A
Cited
GB556401A
Cited
US2444456A
Cited
US2500234A
Cited
US2542539A
Cited
US2468157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-20 | 1957-01-19 | 1957-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-20 | 1961-01-19 | 1961-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-20 | 1965-01-19 | 1965-07-21 | $7700.00 | Window Closed / Lapsed |