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Class Information
Number: 181/292
Name: Acoustics > Sound-modifying means > Sound absorbing panels > Multilayer panel or wall structure > With perforated or porous face and honeycomb-like core
Description: Subject matter having at least one porous or perforated layer and at least one honeycomb-like layer.










Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
6889499 Internal combustion engine exhaust system May. 10, 2005
6877585 Acoustical ceiling tiles Apr. 12, 2005
6871725 Honeycomb core acoustic unit with metallurgically secured deformable septum, and method of manufacture Mar. 29, 2005
6868940 Sound absorbing panel Mar. 22, 2005
6851515 Soundproofing panel, in particular structural or lining panel for a rotorcraft Feb. 8, 2005
6840349 Multi-component acoustically resistive layer for acoustical attenuation panel and panel thus obtained Jan. 11, 2005
6830796 Acoustic board with an improved composite structure Dec. 14, 2004
6827180 Noise attenuation panel Dec. 7, 2004
6820720 Sound-absorbing article effective over a broad frequency range Nov. 23, 2004
6811372 Device at an acoustic liner Nov. 2, 2004
6790520 Vibration dampening laminate Sep. 14, 2004
6772857 Acoustically resistive layer for an acoustical attenuation panel, panel using such a layer Aug. 10, 2004
6755280 Method for producing a panel comprising an adapted acoustically resistive layer and panel so obtained Jun. 29, 2004
6736181 Method and apparatus for applying a film adhesive to a perforated panel May. 18, 2004
6713150 Acoustically effective rear parcel shelf Mar. 30, 2004
6622818 Sound attenuating device Sep. 23, 2003
6617002 Microperforated polymeric film for sound absorption and sound absorber using same Sep. 9, 2003
6615950 Sandwich acoustic panel Sep. 9, 2003
6609592 Noise attenuation panel Aug. 26, 2003
6607625 Process for the production of an acoustively resistive layer, resistive layer thus obtained, and wall using such layer Aug. 19, 2003
6601672 Double layer acoustic liner and a fluid pressurizing device and method utilizing same Aug. 5, 2003
6598701 Shaped microperforated polymeric film sound absorbers and methods of manufacturing the same Jul. 29, 2003
6595321 Floor mats having peripheral apertures with acoustic absorbing material Jul. 22, 2003
6590993 Panel-shaped loudspeaker Jul. 8, 2003
6569509 Ultralight, sound and shock absorbing component set May. 27, 2003
6550574 Acoustic liner and a fluid pressurizing device and method utilizing same Apr. 22, 2003
6536556 Noise reduction sandwich panel, notably for aircraft turbojet engine Mar. 25, 2003
6530453 Sound absorbing structure Mar. 11, 2003
6487822 Ceiling element for a composite ceiling Dec. 3, 2002
6450288 Air-conditioning apparatus, partition and exposure apparatus Sep. 17, 2002
6439340 Acoustically treated structurally reinforced sound absorbing panel Aug. 27, 2002
6382350 Molded acoustic and decorative mats and methods for forming the same May. 7, 2002
6371242 Noise attenuation panel Apr. 16, 2002
6371240 Anechoic chamber Apr. 16, 2002
6352134 Acoustic board Mar. 5, 2002
6334280 Sound absorbing cementitious tile Jan. 1, 2002
6324294 Passenger vehicles incorporating loudspeakers comprising panel-form acoustic radiating elements Nov. 27, 2001
6290022 Sound absorber for sound waves Sep. 18, 2001
6267838 Sandwich panel made of a composite material and production method Jul. 31, 2001
6256959 Building panel with vibration dampening core Jul. 10, 2001
6244378 Dual sonic character acoustic panel and systems for use thereof Jun. 12, 2001
6231710 Method of making composite chambercore sandwich-type structure with inherent acoustic attenuation May. 15, 2001
6220388 Acoustical insulation panel Apr. 24, 2001
6209679 Aircraft engine acoustic liner and method of making same Apr. 3, 2001
6206136 Acoustic liner and method of making an acoustic liner Mar. 27, 2001
6201878 Portable compact disc player Mar. 13, 2001
6198831 Panel-form loudspeakers Mar. 6, 2001
6183837 Soundproof aluminum honeycomb-foam panel Feb. 6, 2001
6182787 Rigid sandwich panel acoustic treatment Feb. 6, 2001
6179086 Noise attenuating sandwich composite panel Jan. 30, 2001

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