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Class Information
Number: 181/219
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > Reaction engine type > With adjustable internal baffles
Description: Subject matter wherein the jet engine shroud comprises a series of repositionable barriers spaced along the internal surface of the shroud.










Patents under this class:

Patent Number Title Of Patent Date Issued
8661822 Acoustically stiffened gas turbine combustor supply Mar. 4, 2014
8443931 Noise reduction of supersonic jet engines May. 21, 2013
8422714 Speaker with acoustic chamber Apr. 16, 2013
8356476 Diesel silencer capable of Tier 3 or Tier 4 operation Jan. 22, 2013
8162101 Ram intake unit having a sound absorbing structure Apr. 24, 2012
7735601 Engine noise Jun. 15, 2010
7533760 Noise reduction tubes May. 19, 2009
7497300 Noise reduction tubes Mar. 3, 2009
7278514 Acoustic noise filter Oct. 9, 2007
7100736 Serviceable muffler Sep. 5, 2006
7055484 Multiple frequency Helmholtz resonator Jun. 6, 2006
7055648 Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive Herschel-Quincke tubes Jun. 6, 2006
6932189 Device for noise structuring in a motor vehicle Aug. 23, 2005
6915876 Exhaust processor with variable tuning system Jul. 12, 2005
6910550 Muffler arrangement for an internal combustion engine Jun. 28, 2005
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
6766027 Elliptical flushmount speaker Jul. 20, 2004
6634457 Apparatus for damping acoustic vibrations in a combustor Oct. 21, 2003
6494290 Noise suppressor with a bypass resonator Dec. 17, 2002
6427801 Apparatus for reducing noise in the jet engine Aug. 6, 2002
6367580 Sound adjustable tail pipe structure Apr. 9, 2002
5821472 Supersonic aircraft exhaust noise suppression system Oct. 13, 1998
5801341 Mechanism of noise suppression system for a supersonic aircraft Sep. 1, 1998
5291672 Sound suppression mixer Mar. 8, 1994
4501393 Internally ventilated noise suppressor with large plug nozzle Feb. 26, 1985
4217756 Vortex mixers for reducing the noise emitted by jet engines Aug. 19, 1980











 
 
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