US3706353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise suppressor for jet engines
Assignee: DEFENSE UK
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Filing: 1971-11-23
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Granted: 1972-12-19
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Expires: 1991-11-23
Abstract
Abstract The disclosure of this invention pertains to noise suppression apparatus for jet engines wherein two convergent but otherwise relatively flat plates are arranged in a position downstream of the exhaust nozzle of an engine and at opposite sides of the nozzle axis so that a generally axisymmetric jet is flattened when passing through between the plates and is thereby caused to spread in a direction transverse to said axis with consequent noise suppression in said direction.
Inventors
- 👤 John Eirwyn Ffowces-Williams
- 👤 Roy Hawkins
- 👤 Hylton Dawson
- 👤 William Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:27
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/44; B; B64; B64D; B64D33/00; B64D33/04; B64D33/06; F02K1/40; F02K1/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
Jet propulsion apparatus for aircraft comprising a jet nozzle defining an axisymmetric discharge opening for combustion products, two members having an operative position downstream of the discharge opening and in spaced apart relationship at opposite sides of the nozzle axis such that two surfaces defined by the respective members are generally parallel in a direction transverse to the nozzle axis but are convergent towards their dowNstream ends and in the direction of said axis; the members being positioned so as to be spaced apart at their upstream ends by an amount greater than, and at their downstream ends by an amount less than the diameter of said opening; whereby in operation the jet flow from the nozzle is spread to either side of the nozzle axis in the direction in which the surfaces are generally parallel.
Claim 2
Dependent Claim
136 words
Jet propulsion apparatus for aircraft comprising a jet nozzle defining an axisymmetric discharge opening for combustion products, two members having an operative position downstream of the discharge opening and in spaced apart relationship at opposite sides of the nozzle axis such that two surfaces defined by the respective members are generally parallel in a direction transverse to the nozzle axis but are convergent towards their dowNstream ends and in the direction of said axis; the members being positioned so as to be spaced apart at their upstream ends by an amount greater than, and at their downstream ends by an amount less than the diameter of said opening; whereby in operation the jet flow from the nozzle is spread to either side of the nozzle axis in the direction in which the surfaces are generally parallel.
Claim 3
Dependent Claim
68 words
Apparatus according to claim 1, wherein said members each having a downstream edge defining the downstream end of the surface related to the member and lateral edges defining the width of the surface, and wherein the members are related for the space between the surfaces to be open to atmosphere at the downstream edges and at least at a part of the lateral edges adjacent the downstream edges.
Claim 4
Dependent Claim
54 words
Apparatus according to claim 1 wherein the members are supported for movement relative to the nozzle between said operative position and an inoperative position in which the surfaces are spaced apart so as to be clear of the axial projection of the nozzle discharge opening thereby to be clear of the jet flow therefrom.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |