Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Communications
Class Information
Number: 181/280
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > With baffle or baffle structure > Spiral > Helical
Description: Subject matter in which the circular path is axially expanding.










Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8689933 Helmholtz resonator for a gas turbine combustion chamber Apr. 8, 2014
8602159 Compact muffler for small two-stroke internal combustion engines Dec. 10, 2013
8459408 Radiated sound reducing structure Jun. 11, 2013
8312962 Sound absorber having helical fixtures Nov. 20, 2012
8061476 Sound dampening flow channel device Nov. 22, 2011
7726444 Exhaust system baffle apparatus Jun. 1, 2010
7661509 Devices for regulating pressure and flow pulses Feb. 16, 2010
7644804 Sound attenuator Jan. 12, 2010
7562742 Air exhaust/inlet sound attenuation mechanism Jul. 21, 2009
7380635 Interference-based exhaust noise attenuation Jun. 3, 2008
7380639 Backpressure reducing exhaust system with stationary blade structure Jun. 3, 2008
7374017 Exhaust system baffling apparatus May. 20, 2008
7117973 Noise suppressor apparatus for a gas duct Oct. 10, 2006
7011180 System for filtering ultrasonic noise within a fluid flow system Mar. 14, 2006
6796403 Exhaust system baffling apparatus Sep. 28, 2004
6588545 Muffler for internal combustion engine Jul. 8, 2003
6571910 Method and apparatus for improved noise attenuation in a dissipative internal combustion engine exhaust muffler Jun. 3, 2003
6554100 Vehicle muffler system Apr. 29, 2003
6510921 Muffler/exhaust extractor Jan. 28, 2003
6446751 Apparatus and method for reducing noise levels Sep. 10, 2002
6385967 Exhaust pipe for motor vehicle muffler May. 14, 2002
5962822 Muffler/exhaust extractor and method Oct. 5, 1999
5844178 Resonance muffler Dec. 1, 1998
5824972 Acoustic muffler Oct. 20, 1998
5558492 Paint sprayer with inlet silencer Sep. 24, 1996
5443371 Noise damper for hermetic compressors Aug. 22, 1995
5423395 Quieted air compressor Jun. 13, 1995
5152366 Sound absorbing muffler Oct. 6, 1992
5109950 Silencer for exhaust gases and part of an exhaust line having such a silencer May. 5, 1992
5058704 Turbo jet muffler Oct. 22, 1991
5029512 Firearm muzzle silencer Jul. 9, 1991
4993512 Exhaust duct part in particular for an internal combustion engine Feb. 19, 1991
4792014 Tail pipe for drafting engine exhaust gas Dec. 20, 1988
4751980 Sound attenuation apparatus Jun. 21, 1988
4693339 Muffler for gas inducting machinery generating low frequency noise Sep. 15, 1987
4685534 Method and apparatus for control of fluids Aug. 11, 1987
4683978 Exhaust silencer Aug. 4, 1987
4679597 Liquid pulsation dampening device Jul. 14, 1987
4667770 Sound attenuator May. 26, 1987
4667769 Supercharger intake air muffler or sound absorber, and method of muffling inrush air May. 26, 1987
4632359 Low noise flow control valve Dec. 30, 1986
4605092 Large, high r.p.m. diesel engine exhaust muffler Aug. 12, 1986
4601363 Large diesel engine exhaust muffler Jul. 22, 1986
4579195 Exhaust gas silencer Apr. 1, 1986
4574913 Muffler with spark arresting function Mar. 11, 1986
4533015 Sound arresting device Aug. 6, 1985
4485890 Engine exhaust muffler Dec. 4, 1984
4339918 Means for accelerating the discharge of exhaust gas from an internal combustion engine Jul. 20, 1982
4317502 Engine exhaust muffler Mar. 2, 1982
4262770 Porous acoustic element and a method of controlling aerodynamic noise in a flowing gas Apr. 21, 1981

1 2










 
 
  Recently Added Patents
Method for producing cathode active material for a lithium secondary battery
Light emitting device
Fail-safe upgrading of portable electronic device software
Electronic component and reflected-wave cancelling method
Apparatus for controllable delay cell and associated methods
Transmission apparatus, receiving apparatus, method, and storage medium
Portable electronic device holder and tether
  Randomly Featured Patents
Anti-rotation locking device for preventing separation of coupling nuts from fluid lines
Method and an apparatus for monitoring an animal
Illuminating device
Low cost acknowledge-back system for a pager using existing infrastructure
Method of detecting and indicating errors in a memory device
Remote control system, remote control operating device, and remote control method
Tool unclamping device
Method and apparatus for preparing a beverage
Apparatus comprising straps with end attachments for removably fastening objects to be dried within dryer drum
Dual pressure gas compressor