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Class Information
Number: 181/215
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > Reaction engine type > With adjustable outlet nozzle
Description: Subject matter wherein the shroud is comprised of adjustable tail end sections and the position of the shroud end sections determine the degree of attenuation.










Sub-classes under this class:

Class Number Class Name Patents
181/216 Longitudinally adjustable section 21


Patents under this class:

Patent Number Title Of Patent Date Issued
8677758 Dilating fan duct nozzle Mar. 25, 2014
8621842 Exhaust silencer convection cooling Jan. 7, 2014
8613398 Apparatus and methods for linear actuation of flow altering components of jet engine nozzle Dec. 24, 2013
8549834 Gas turbine engine with variable area fan nozzle Oct. 8, 2013
8443931 Noise reduction of supersonic jet engines May. 21, 2013
8430203 Noise reduction device for turbojet nacelle with mobile chevrons, and associated nacelle Apr. 30, 2013
8393435 Trailing edge for an aircraft engine, of the type with moving chevrons Mar. 12, 2013
7883049 Jet nozzle having noise attenuating shield and method therefor Feb. 8, 2011
7735601 Engine noise Jun. 15, 2010
7533760 Noise reduction tubes May. 19, 2009
7497300 Noise reduction tubes Mar. 3, 2009
7308966 Device for reducing jet engine exhaust noise using oscillating jets Dec. 18, 2007
7051523 Exhaust system assemblies employing wire bushings for thermal compensation May. 30, 2006
6901752 Exhaust processor with variable tuning system and method of operating such exhaust processor Jun. 7, 2005
6896100 Noise reducing apparatus and exhaust nozzle for jet engine May. 24, 2005
6799423 Adjustable exhaust system for internal combustion engine Oct. 5, 2004
6705547 Active noise reducing nozzle Mar. 16, 2004
6427801 Apparatus for reducing noise in the jet engine Aug. 6, 2002
5941065 Stowable mixer ejection nozzle Aug. 24, 1999
5821472 Supersonic aircraft exhaust noise suppression system Oct. 13, 1998
5801341 Mechanism of noise suppression system for a supersonic aircraft Sep. 1, 1998
5717172 Sound suppressor exhaust structure Feb. 10, 1998
5517865 Vortex suppression for an eductor May. 21, 1996
5402963 Acoustically shielded exhaust system for high thrust jet engines Apr. 4, 1995
5078631 Marine exhaust system Jan. 7, 1992
5022877 Marine exhaust system Jun. 11, 1991
5014933 Translating lip aircraft cowling structure adapted for noise reduction May. 14, 1991
4934481 Arrangement for suppressing jet engine noise Jun. 19, 1990
4930308 Double-flow turboshaft engine with variable confluent nozzle Jun. 5, 1990
4754924 Variable geometry nozzle Jul. 5, 1988
4516660 Ejector and method for controlling jet engine noise May. 14, 1985
4501393 Internally ventilated noise suppressor with large plug nozzle Feb. 26, 1985
4422524 Variable shape, fluid flow nozzle for sound suppression Dec. 27, 1983
4306412 Jet engine and method of operating the same Dec. 22, 1981
4291782 Simplified method and apparatus for hot-shield jet noise suppression Sep. 29, 1981
4244294 Stowable nozzle plug and method for air breathing missile Jan. 13, 1981
3990530 Noise suppressor for turbine type power plant Nov. 9, 1976
3976160 Device for the attenuation of noise emission by the jet pipes of jet engines Aug. 24, 1976











 
 
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