Patent US3743185A successfully refreshed from Google Patents.
US3743185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise suppressor for jet engines
Assignee: UK Secretary of State for Defence
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Filing: 1971-11-23
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Granted: 1973-07-03
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Expires: 1991-11-23
Abstract
Abstract The disclosure of this invention pertains to an exhaust nozzle for jet engines wherein the nozzle has a generally circular outlet opening defined by an edge lying in a plane normal to the nozzle axis except at two diametrically opposite localities at each of which the edge defines a recess where the nozzle is laterally open to the ambient air. The presence of the recesses causes the jet to spread in the plane of the recesses with the effect of sound suppression in that plane.
Inventors
- 👤 Williams J Fowces
- 👤 W Smith
- 👤 R Hawkins
- 👤 H Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:06
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/40; F02K1/42
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
An exhaust nozzle for a jet engine, comprising: a first duct portion having an edge defining the discharge opening of said nozzle, said edge lying in a plane substantially normal to the longitudinal axis of said nozzle; first and second opposed recessed portions formed in said edge of said first duct portion for spreading a portion of the stream of outlet gas passing through the nozzle substantially laterally of the main stream; a second duct portion coaxial with said first duct portion; and means for rotating said first And second duct portions relative to each other to rotate the plane of the laterally spread portion of said stream of outlet gas through a predetermined angle.
Claim 2
Dependent Claim
115 words
An exhaust nozzle for a jet engine, comprising: a first duct portion having an edge defining the discharge opening of said nozzle, said edge lying in a plane substantially normal to the longitudinal axis of said nozzle; first and second opposed recessed portions formed in said edge of said first duct portion for spreading a portion of the stream of outlet gas passing through the nozzle substantially laterally of the main stream; a second duct portion coaxial with said first duct portion; and means for rotating said first And second duct portions relative to each other to rotate the plane of the laterally spread portion of said stream of outlet gas through a predetermined angle.
Claim 3
Dependent Claim
67 words
The exhaust nozzle as defined in claim 1, wherein said second duct portion comprises first and second members extending substantially parallel to the longitudinal axis of said nozzle, said first and second members cooperating with said first duct portion to close the openings formed by said recessed portions when said first and second duct portions have been rotated through a further predetermined angle relative to each other.
Claim 4
Dependent Claim
34 words
The nozzle as defined in clam 1, wherein the plane of said laterally spread portion is rotatable by the relative rotation of said first and second duct portions through an angle of approximately 90*.
Claim 5
Dependent Claim
34 words
The nozzle as defined in clam 1, wherein the plane of said laterally spread portion is rotatable by the relative rotation of said first and second duct portions through an angle of approximately 90*.
Claim 6
Dependent Claim
21 words
The exhaust nozzle as defined in claim 1, wherein said second duct portion is located upstream of said first duct portion.
Claim 7
Dependent Claim
46 words
Nozzle according to claim 1 wherein said second duct portion is convergent and has at its small area end an edge defining a discharge opening, said first duct portion is of uniform flow area and extends downstream of the discharge opening of the second duct portion.
References Cited (Backward Citations)
US3153319A
Cited
US2914916A
Cited
US3095697A
Cited
US2975593A
Cited
US3344882A
Cited
DE1301341B
Cited
US3612399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |