US2638740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal-combustion turbine power plant
Assignee: Napier Turbochargers Ltd
•
Filing: 1950-07-03
•
Granted: 1953-05-19
•
Expires: 1970-07-03
Abstract
No abstract record available.
Inventors
- 👤 Sammons Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:32
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1660439A
Cited
US1677026A
Cited
GB290222A
Cited
DE564300C
Cited
US2073191A
Cited
US2186999A
Cited
GB593403A
Cited
US2520434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |