Patent US2838907A successfully refreshed from Google Patents.
US2838907A
Expired / Lapsed
US
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Power units comprising an internal combustion engine and an exhaust driven turbo-supercharger
Assignee: Napier Turbochargers Ltd
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Filing: 1953-02-03
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Granted: 1958-06-17
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Expires: 1973-02-03
Abstract
No abstract record available.
Inventors
- 👤 Cowland William Geoffrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:54
CPC Classifications
F; F02; F02B; F02B37/00; F02B37/02; F02B37/12; F02B37/22; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1856024A
Cited
US1816737A
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US1816787A
Cited
US2147935A
Cited
US2581600A
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US2444644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |