US3712412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound suppressing system
Assignee: Environeering Inc
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Filing: 1971-11-18
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Granted: 1973-01-23
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Expires: 1991-11-18
Abstract
Abstract A system for suppressing sound in a high velocity fluid stream comprising conduit means extending downstream of the source of said sound, said conduit means having a cross-sectional flow area with a transverse dimension less than one half the wave length of the sound in said fluid, and a tunable, acoustic resonator having an inlet in communication with said conduit means downstream of said source and a closed, adjustable outer end, said resonator angularly intersecting the conduit means and reflecting sound waves received through the inlet back into said conduit means to attenuate succeeding sound waves therein.
Inventors
- 👤 J Hassett
- 👤 W Ihde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:28
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/02; G; G10; G10K; G10K11/00; G10K11/16; G10K11/172; F01N2490/00; F01N2490/14
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
89 words
A system for suppressing sound generated at a source in a high velocity fluid stream comprising conduit means extending downstream of said source, said conduit means having a crosssectional flow area with a transverse dimension less than one half the wavelength of the sound in said fluid, and a tunable acoustic resonator having an inlet in communication with said conduit means downstream of said source and angularly intersecting the same for reflecting waves received through the inlet back into said conduit means to attenuate the succeeding sound waves therein.
Claim 2
Independent Claim
89 words
A system for suppressing sound generated at a source in a high velocity fluid stream comprising conduit means extending downstream of said source, said conduit means having a crosssectional flow area with a transverse dimension less than one half the wavelength of the sound in said fluid, and a tunable acoustic resonator having an inlet in communication with said conduit means downstream of said source and angularly intersecting the same for reflecting waves received through the inlet back into said conduit means to attenuate the succeeding sound waves therein.
Claim 3
Dependent Claim
61 words
The system for suppressing sound as set forth in claim 1 wherein said tunable acoustic resonator comprises a tubular sleeve with an open inlet end connected to said conduit means, and an outer end wall mounted for sliding movement in said sleeve toward and away from said open end, and means for adjustably positioning said outer end wall in said sleeve.
Claim 4
Dependent Claim
67 words
The system of claim 1 wherein said conduit means comprises a tubular stack having a maximum transverse dimension of approximately one wavelength of said sound in said fluid and longitudinal divider means in said stack extended upstream and downstream of said inlet of said resonator and providing a reflective surface opposite said opening spaced less than a half wavelength therefrom in a direction transversely of said stack.
Claim 5
Dependent Claim
23 words
The system of claim 3 including another of said tunable acoustic resonators having its inlet facing an opposite side of said divider means.
Claim 6
Dependent Claim
51 words
The system of claim 4 wherein said longitudinal divider means includes a plurality of divider walls, pairs of said divider walls forming divergent reflective surfaces, and a plurality of said resonators mounted on said stack, each resonator with its inlet end positioned to face one pair of said divergent reflective surfaces.
Claim 7
Dependent Claim
36 words
The system of claim 1 wherein said inlet of said tunabLe resonator is positioned downstream of said source in said conduit means by a distance at least equal to double the value of said major dimension.
Claim 8
Dependent Claim
38 words
The system of claim 4 wherein said acoustic resonators are dimensioned to have a transverse cross-sectional area of approximately the same value as the adjacent cross-sectional flow areas in said stack as divided by said longitudinal divider means.
Claim 9
Dependent Claim
25 words
The system of claim 1 including in combination another of said tunable acoustic resonators mounted downstream of said first mentioned resonator on said conduit means.
Claim 10
Dependent Claim
74 words
The system of claim 2 wherein said sleeve comprises a cylindrical tube open at said outer end; said outer end wall comprising a circular disk with a cylindrical rim around the periphery thereof disposed in slidingly sealed concentric relation within said tube; said adjusting means comprising a bracket diametrically extended across said open outer end of said tube and longitudinal adjustment means coaxially aligned in said tube interconnecting said bracket and said circular disk.
Claim 11
Dependent Claim
60 words
The system of claim 9 wherein said resonator sleeve extends outwardly of said conduit at right angles thereto and longitudinal divider means in said conduit having a surface facing the inlet end of said sleeve and normal to the longitudinal axis thereof, said surface spaced from said inlet end of said sleeve by a distance less than one-half said wavelength.
Claim 12
Dependent Claim
31 words
The system of claim 8 wherein said tunable resonators are spaced apart in the direction of fluid flow in said conduit means by a distance approximating 1 wavelength of said sound.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |