US3566606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine ducted fan engine
Assignee: Rolls Royce PLC
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Filing: 1969-05-16
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Granted: 1971-03-02
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Expires: 1989-05-16
Abstract
Abstract A GAS TURBINE DUCTED FAN ENGINE HAS A FAN HOUSED IN A FAN DUCT. A PORTION OF THE FAN DUCT IS CONSTITUTED BY TWO SPACED APART WALLS, ONE WALL CONSISTING OF MEMBERS EACH OF WHICH HAS A FLANGE WHICH EXTENDS TO THE OTHER WALL AND IS ATTACHED THERETO.
Inventors
- 👤 James Oswald Mortlock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:35
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/04; F02C7/047; F05; F05D; F05D2260/00; F05D2260/20; F05D2260/201
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |