US2920447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine engine with starting means
Assignee: Rolls Royce PLC
•
Filing: 1955-11-21
•
Granted: 1960-01-12
•
Expires: 1975-11-21
Abstract
No abstract record available.
Inventors
- 👤 Hollings John Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:48
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/26; F02C7/268; F02C7/275; F02C7/277; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2704645A
Cited
US2608054A
Cited
US2457833A
Cited
US2671315A
Cited
US2691274A
Cited
US2749023A
Cited
US2806351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |