Patent US3905445A successfully refreshed from Google Patents.
US3905445A
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Vortex turbulence noise generation suppressor
Assignee: RTX BBN Technologies Corp
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Filing: 1973-07-20
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Granted: 1975-09-16
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Expires: 1993-07-20
Abstract
Abstract This disclosure deals with structures for suppressing a substantial percentage of noise that normally is attendant upon vortex generation from jet engines, blown flaps, turbine outlets and the like, involving successive tubular sections of successively reduced width disposed longitudinally, preferably along a common axis.
Inventors
- 👤 Terry D Scharton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:32
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/08; F01N13/082; F02; F02K; F02K1/00; F02K1/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
A noise generation suppresSor for breaking up the exhaust of a jet outlet into a plurality of streams while minimizing flowdividing drag, having, in combination, means including a plurality of successive longitudinally extending passages of successively smaller cross-dimension for dividing said exhaust into a plurality of streams and for breaking up the vortex pattern of said exhaust, each of said passages having an inlet at one end and an outlet at the opposite end, each inlet being located adjacent the outlet of the preceding passage and remote from the inlet of the preceding passage, and each passage being substantially freely open and devoid of transverse sub-division along said cross-dimension throughout most of its length.
Claim 2
Dependent Claim
114 words
A noise generation suppresSor for breaking up the exhaust of a jet outlet into a plurality of streams while minimizing flowdividing drag, having, in combination, means including a plurality of successive longitudinally extending passages of successively smaller cross-dimension for dividing said exhaust into a plurality of streams and for breaking up the vortex pattern of said exhaust, each of said passages having an inlet at one end and an outlet at the opposite end, each inlet being located adjacent the outlet of the preceding passage and remote from the inlet of the preceding passage, and each passage being substantially freely open and devoid of transverse sub-division along said cross-dimension throughout most of its length.
Claim 3
Dependent Claim
19 words
A noise generation suppressor as claimed in claim 1 and in which said passages are of about equal length.
Claim 4
Dependent Claim
24 words
A noise generation suppressor as claimed in claim 1 and in which each of said passages overlaps only a portion of the preceding passage.
Claim 5
Dependent Claim
18 words
A noise generation suppressor as claimed in claim 1 and in which said passages have substantially cylindrical cross-section.
Claim 6
Dependent Claim
18 words
A noise generation suppressor as claimed in claim 1 and in which said passages have substantially rectangular cross-section.
Claim 7
Dependent Claim
17 words
A noise generation suppressor as claimed in claim 1 and in which said passages comprise plate members.
Claim 8
Dependent Claim
18 words
A noise generation suppressor as claimed in claim 1 and in which said passage outlets are rectangular slits.
Claim 9
Dependent Claim
34 words
A noise generation suppressor as claimed in claim 1 and in which said jet outlet has associated therewith a converging potential core and in which said passages are located within the converging potential core.
References Cited (Backward Citations)
US2995200A
Cited
US3528336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |