US3968944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft with shrouded propeller drive
Assignee: Dornier GmbH
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Filing: 1975-02-27
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Granted: 1976-07-13
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Expires: 1995-02-27
Abstract
Abstract This invention relates to an improvement in an aircraft having a tail-mounted, shrouded pusher-type propeller and an engine mounted in front of the shroud, the improvement comprising exhaust pipe running from the engine to the shroud.
Inventors
- 👤 Friedhelm Zimmer
- 👤 Zimmer Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:37
CPC Classifications
B; B64; B64D; B64D33/00; B64D33/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
In an aircraft having a tail-mounted, shrouded pusher-type propeller and an engine mounted in front of the shroud, the improvement comprising exhaust pipe means running from said engine to said shroud, said shroud having sound absorbing means therein including a plurality of means connected to individual cylinders or cylinder groups, and said exhaust pipe means forming the leading edges of struts supporting said shroud and being connected to a circular pipe line in the nose of the shroud.
Claim 2
Dependent Claim
78 words
In an aircraft having a tail-mounted, shrouded pusher-type propeller and an engine mounted in front of the shroud, the improvement comprising exhaust pipe means running from said engine to said shroud, said shroud having sound absorbing means therein including a plurality of means connected to individual cylinders or cylinder groups, and said exhaust pipe means forming the leading edges of struts supporting said shroud and being connected to a circular pipe line in the nose of the shroud.
References Cited (Backward Citations)
US2504137A
Cited
US2907536A
Cited
US2888001A
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US3113634A
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US2998700A
Cited
US3230702A
Cited
US3105353A
Cited
US3302404A
Cited
US3672169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |