US2500860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal-combustion engine power plant
Assignee: Napier Turbochargers Ltd
•
Filing: 1948-02-18
•
Granted: 1950-03-14
•
Expires: 1968-02-18
Abstract
No abstract record available.
Inventors
- 👤 Penn Alfred John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:07
CPC Classifications
F; F02; F02B; F02B37/00; F02B37/04; F02B37/10; F02B37/105; F02B37/005; F02B37/12; F02B37/16; F02B37/164; F02B37/166; F02B37/22; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2427846A
Cited
US1279128A
Cited
GB479822A
Cited
US2385366A
Cited
US2421518A
Cited
FR877590A
Cited
US2411227A
Cited
US2443717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |