Patent US2654993A successfully refreshed from Google Patents.
US2654993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine engine with multiple turbines
Assignee: Bristol Aeroplane Co Ltd
•
Filing: 1949-09-16
•
Granted: 1953-10-13
•
Expires: 1969-09-16
Abstract
No abstract record available.
Inventors
- 👤 Owner Frank Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:13
CPC Classifications
F; F02; F02C; F02C6/00; F02C6/20; F02C6/206; F02C7/00; F02C7/32
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
FR620680A
Cited
US2085761A
Cited
US2095991A
Cited
CH213793A
Cited
US2476179A
Cited
US2474582A
Cited
US2465099A
Cited
US2418911A
Cited
US2587057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-12 | 1957-04-13 | 1957-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-12 | 1961-04-13 | 1961-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-12 | 1965-04-13 | 1965-10-13 | $7700.00 | Window Closed / Lapsed |