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Class Information
Number: 181/224
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > Sound absorbing ventilating duct or curb (e.g., a/c, heat, air flow type)
Description: Subject matter comprising ducts or conduits for the movement of streams of air therethrough.










Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
8701821 Acoustic dampening sleeve for electronic equipment and method of making the same Apr. 22, 2014
8701822 Gas-guiding pipe comprising a noise-attenuating covering with variable porosity Apr. 22, 2014
8702379 Quiet blower apparatus and system and method for reducing blower noise Apr. 22, 2014
8678131 Acoustic baffle for centrifugal blowers Mar. 25, 2014
8641494 Ventilation device and frame system Feb. 4, 2014
8584795 Filter silencer Nov. 19, 2013
8579074 Intake silencer for gas turbine Nov. 12, 2013
8579075 Blackout silencer Nov. 12, 2013
8579577 Fan with sound-muffling box Nov. 12, 2013
8511428 Noise attenuator and vehicle air intake duct provided therewith Aug. 20, 2013
8511426 Sound attenuating air vent Aug. 20, 2013
8485310 Silencing equipment for electric devices Jul. 16, 2013
8459407 Sound attenuation systems and methods Jun. 11, 2013
8453790 Fan coil ceiling unit with closely coupled silencers Jun. 4, 2013
8418804 Multiple Helmholtz resonators Apr. 16, 2013
8408357 Air duct attenuator Apr. 2, 2013
8408356 Storage box for electronic apparatus Apr. 2, 2013
8381871 Compact low frequency resonator Feb. 26, 2013
8336672 Air treatment and sound reduction system Dec. 25, 2012
8316986 Sound attenuation canopy Nov. 27, 2012
8307947 Duct sound damper for a flow machine Nov. 13, 2012
8286751 Muffling device Oct. 16, 2012
8272475 Sound attenuator for low frequencies, method for manufacturing sound attenuator for low frequencies and system for attenuating low frequencies for example in air-conditioning ducts of paper mi Sep. 25, 2012
8240427 Sound attenuation systems and methods Aug. 14, 2012
8240428 Aspirator with integral muffler Aug. 14, 2012
8240429 System method and devices for windage noise damping in induction motor Aug. 14, 2012
8230967 Vane type silencers in elbow for gas turbine Jul. 31, 2012
8219363 Jet noise modeling method, jet noise analyzing method, and aircraft designing method Jul. 10, 2012
8213176 Systems and methods for providing airflow Jul. 3, 2012
8210308 Sound attentuator Jul. 3, 2012
8210307 Sonic absorption device for an air pipeline of an aircraft, in particular of an air conditioning system of an aircraft Jul. 3, 2012
8166775 Noise attenuating device for a heating-ventilation-cooling system of a motor vehicle May. 1, 2012
8151931 Acoustic noise control in heating or cooling systems Apr. 10, 2012
8146706 Air duct for vehicle air conditioning and air conditioner for vehicle Apr. 3, 2012
8144465 Fan assembly and electronic device incorporating the same Mar. 27, 2012
8128158 Method and device for attenuating aerodynamically induced noises caused by vehicle grille Mar. 6, 2012
8091682 Sound absorbing system for electronic device Jan. 10, 2012
8094853 Speaker system and fitting device Jan. 10, 2012
8087491 Vane type silencers in elbow for gas turbine Jan. 3, 2012
8087492 Methods and systems for integrating sound attenuation into a filter bank Jan. 3, 2012
8074765 Sound absorbing structure of electronic equipment Dec. 13, 2011
8069947 Sound attenuation canopy Dec. 6, 2011
8061474 Perforation acoustic muffler assembly and method of reducing noise transmission through objects Nov. 22, 2011
8061476 Sound dampening flow channel device Nov. 22, 2011
8061477 Acoustic management of fluid flow within a duct Nov. 22, 2011
8043690 Exhaust washed structure and associated composite structure and method of fabrication Oct. 25, 2011
8020663 Method for reducing the noise generated by a hole under a high energy gas flow Sep. 20, 2011
8006800 Storage box for electronic apparatus Aug. 30, 2011
8005235 Multi-chamber noise control system Aug. 23, 2011
7986526 Acoustically absorptive apparatus for an electronics rack of a data center Jul. 26, 2011

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