US3666044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jet engine sound suppressor
Assignee: Individual
•
Filing: 1971-04-13
•
Granted: 1972-05-30
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Expires: 1991-04-13
Abstract
Abstract An elongated tubular jet engine nozzle including inner wall surfaces, sound wave trap means extending along and spaced about said inner wall surfaces operative to effectively trap and absorb a majority of sound waves incident thereon along paths inclined 15* or more relative to the center line of the nozzle. The nozzle includes rigid sound wave reflecting surfaces spaced along and about the inner wall surfaces of the nozzle inclined at least 10* relative to the longitudinal center line of the nozzle and the reflecting surfaces are operative to reflect sound waves moving generally axially of the nozzle and incident thereon toward the remote inner wall surfaces and the associated sound wave trap means thereon along paths inclined more than 15* relative to the center line of the nozzle.
Inventors
- 👤 Claud R Killian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:18
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/78; F02K1/82; F02K1/827
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
115 words
An elongated tubular jet engine nozzle including inner wall surfaces, sound wave trap means extending along and spaced about said inner wall surfaces operative to trap anD absorb a majority of sound waves incident thereon along paths inclined to 15* or more relative to the center line of the nozzle, and rigid sound wave reflecting surface means spaced along and about said inner wall surfaces inclined at least 10* relative to the center line of said nozzle and facing upstream therein operative to reflect generally axially moving sound waves incident thereon toward the remote inner wall surfaces and associated sound wave trap means thereon along paths inclined more than 15* relative to said center line.
Claim 2
Dependent Claim
115 words
An elongated tubular jet engine nozzle including inner wall surfaces, sound wave trap means extending along and spaced about said inner wall surfaces operative to trap anD absorb a majority of sound waves incident thereon along paths inclined to 15* or more relative to the center line of the nozzle, and rigid sound wave reflecting surface means spaced along and about said inner wall surfaces inclined at least 10* relative to the center line of said nozzle and facing upstream therein operative to reflect generally axially moving sound waves incident thereon toward the remote inner wall surfaces and associated sound wave trap means thereon along paths inclined more than 15* relative to said center line.
Claim 3
Dependent Claim
48 words
The combination of claim 1 wherein said sound wave trap means includes generally axially extending longitudinally slotted tubular members supported from said inner wall surfaces in side by side relation and with the slots of said tubular members opening generally radially toward said center line of said nozzle.
Claim 4
Dependent Claim
53 words
The combination of claim 2 wherein said tubular members include converging edge portions defining said slots, elongated angle members extending along said nozzle between adjacent tubular members and positioned with their apexes innermost toward said center line and abridging the spacing between adjacent marginal edge portions of the slot of adjacent tubular members.
Claim 5
Dependent Claim
56 words
The combination of claim 1 wherein said sound wave reflecting surface means comprise inclined plates supported from said sound wave trap means and contoured to conform, in their inclined positions, to the internal configuration of said nozzle, said plates projecting inwardly from the corresponding sound wave trap means to points spaced radially of said center line.
Claim 6
Dependent Claim
62 words
The combination of claim 4 wherein the downstream marginal portions of said plates have transverse notches formed therein, and adjustable flaps pivotally secured in said notches for adjusted angular displacement about axises extending transversely of said nozzle, and motor means operatively connected between said nozzle and said flaps for variably inclining the latter relative to said center line and the corresponding plates.
Claim 7
Independent Claim
100 words
The method of reducing the sound emanating from the discharge nozzle of a jet engine, said method comprising the steps of lining the internal walls of the jet engine nozzle upstream from the discharge end thereof with sound wave trapping and absorbing structure and providing sound wave reflective surfaces within the discharge nozzle at points spaced therealong and thereabout with the sound wave reflecting surfaces being inclined relative to the center line of the nozzle and projecting generally radially inwardly from the sound wave absorbing lining to a point spaced radially outwardly from the center line of the discharge nozzle.
Claim 8
Independent Claim
100 words
The method of reducing the sound emanating from the discharge nozzle of a jet engine, said method comprising the steps of lining the internal walls of the jet engine nozzle upstream from the discharge end thereof with sound wave trapping and absorbing structure and providing sound wave reflective surfaces within the discharge nozzle at points spaced therealong and thereabout with the sound wave reflecting surfaces being inclined relative to the center line of the nozzle and projecting generally radially inwardly from the sound wave absorbing lining to a point spaced radially outwardly from the center line of the discharge nozzle.
Claim 9
Dependent Claim
57 words
The combination of claim 1 wherein said sound wave trap means includes generally axially extending longitudinally slotted tubular members supported from said inner wall surfaces in side by side relation and with the slots of said tubular members opening generally radially toward said center line of said nozzle, said tubular members being generally cylindrical in cross-sectional shape.
Claim 10
Dependent Claim
56 words
The combination of claim 7 wherein said sound wave reflecting surface means comprise inclined plates supported from said sound wave trap means and contoured to conform, in their inclined positions, to the internal configuration of said nozzle, said plates projecting inwardly from the corresponding sound wave trap means to points spaced radially of said center line.
Claim 11
Dependent Claim
62 words
The combination of claim 8 wherein the downstream marginal portions of said plates have transverse notches formed therein, and adjustable flaps pivotally secured in said notches for adjusted angular displacement about axises extending transversely of said nozzle, and motor means operatively connected between said nozzle and said flaps for variably inclining the latter relative to said center line and the corresponding plates.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |