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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
6148954 Fan inlet flow controller Nov. 21, 2000
6145616 Acoustic chamber Nov. 14, 2000
6139427 Ventilation system Oct. 31, 2000
6131696 Multiple inlet muffler Oct. 17, 2000
6116375 Acoustic resonator Sep. 12, 2000
6112850 Acoustic silencer nozzle Sep. 5, 2000
6102153 Compact air handling unit with integral silencing Aug. 15, 2000
6104608 Noise reduction hood for an electronic system enclosure Aug. 15, 2000
6095281 Low noise air conditioner housing Aug. 1, 2000
6072880 Modular active silencer with port dish Jun. 6, 2000
6059070 Soundproofed conduit to discharge fumes May. 9, 2000
6056084 Exhaust silencer panel May. 2, 2000
6035964 Gas turbine muffler with diffusor Mar. 14, 2000
6027406 Centrifugal fan unit with vertical rotation axis Feb. 22, 2000
5950273 Noise reduction system for a rotary positive blower Sep. 14, 1999
5929396 Noise reducing diffuser Jul. 27, 1999
5894114 Sound absorber for blower Apr. 13, 1999
5869792 Reactive acoustic silencer Feb. 9, 1999
5861585 Aeracoustic wind tunnel turning vanes Jan. 19, 1999
5859393 Reduced cost vent silencer Jan. 12, 1999
5832674 Sound absorption rooftop curb Nov. 10, 1998
5828759 System and method for reducing engine noise Oct. 27, 1998
5821473 Silencer and a method for forming and attaching a silencer to a blower pipe Oct. 13, 1998
5817990 Wall structure for sound attenuating apparatus Oct. 6, 1998
5801342 Double-walled structure and method and arrangement for producing the same Sep. 1, 1998
5728979 Air handling structure for fan inlet and outlet Mar. 17, 1998
5728980 Duct silencer Mar. 17, 1998
5723828 Hollow plastic product having a sound attenuator Mar. 3, 1998
5722644 Pre-shaped vibration-damping member for deformed portion Mar. 3, 1998
5709529 Optimization of turbomachinery harmonics Jan. 20, 1998
5700527 Sound-absorbing glass building component or transparent synthetic glass building component Dec. 23, 1997
5696361 Multi-ducts sound eliminator for air pipe Dec. 9, 1997
5679931 Sound attenuating apparatus and method of forming the same Oct. 21, 1997
5663536 Sound attenuation assembly for air-cooling apparatus Sep. 2, 1997
5663535 Sound attenuator for HVAC systems Sep. 2, 1997
5650599 Noise cancellation method and apparatus Jul. 22, 1997
5636286 Active noise reduction device for electronic apparatus Jun. 3, 1997
5625172 Engine enclosure air inlet/discharge sound attenuator Apr. 29, 1997
5598479 Device for reducing tire/road surface noise Jan. 28, 1997
5587563 Air handling structure for pan inlet and outlet Dec. 24, 1996
5548093 Low noise hose Aug. 20, 1996
5532439 Silencer assembly with acoustical modules therein Jul. 2, 1996
5513266 Integral active and passive silencer Apr. 30, 1996
5511127 Active noise control Apr. 23, 1996
5491308 Turbine inlet silencer Feb. 13, 1996
5473124 Packless silencer Dec. 5, 1995
5473123 Air handling structure for fan inlet and outlet Dec. 5, 1995
5471537 Kitchen ventilator Nov. 28, 1995
5471020 Modal silencer Nov. 28, 1995
5460570 Ventilator for elevator cage Oct. 24, 1995

1 2 3 4 5 6










 
 
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