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Class Information
Number: 181/235
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > Underwater discharge
Description: Subject matter wherein the fluid is ejected under water.










Patents under this class:

Patent Number Title Of Patent Date Issued
8689935 Abating low-frequency noise using encapsulated gas bubbles Apr. 8, 2014
8505681 Method and apparatus for altering and or minimizing underwater noise Aug. 13, 2013
8056673 Sound dampening and wear protecting flapper configuration for marine exhaust system Nov. 15, 2011
7942238 Marine muffler with angularly disposed internal baffle May. 17, 2011
7921964 Method and apparatus for altering and/or minimizing underwater noise Apr. 12, 2011
7913809 Flapper configuration for marine exhaust system Mar. 29, 2011
7886870 Exhaust apparatus for small boat Feb. 15, 2011
6564901 Muffler for marine engine May. 20, 2003
6412595 Economical exhaust muffler system for a marine propulsion apparatus Jul. 2, 2002
5969300 Wet marine exhaust muffler Oct. 19, 1999
5824970 Marine engine silencer having internal apertured baffle and weir plate Oct. 20, 1998
5719358 Arrangement for muffling the exhaust sound of a boat motor Feb. 17, 1998
5625173 Single baffle linear muffler for marine engines Apr. 29, 1997
5616893 Reverse entry muffler with surge suppression feature Apr. 1, 1997
5594217 Exhaust muffler for small marine craft Jan. 14, 1997
5588888 Wet marine exhaust muffler Dec. 31, 1996
5561276 Two-phase-flow muffler in a rotating shaft Oct. 1, 1996
5550337 Exhaust system for a small planing craft Aug. 27, 1996
5504280 Muffler for marine engines Apr. 2, 1996
5444196 In line insertion muffler for marine engines Aug. 22, 1995
5442148 Exhaust muffler for outboard motors Aug. 15, 1995
5374209 Internal combustion engine exhaust system Dec. 20, 1994
5329074 Marine engine exhaust muffler Jul. 12, 1994
5326942 Noise suppression muffler for moisture laden exhaust gases & method Jul. 5, 1994
5306184 Outboard engine exhaust system Apr. 26, 1994
5262600 In-line insertion muffler for marine engines Nov. 16, 1993
5253603 Underwater vehicle muffler Oct. 19, 1993
5196655 Muffler for marine engine Mar. 23, 1993
5106330 Exhaust relief system with baffle Apr. 21, 1992
5103931 Exhaust silencing means for marine propulsion Apr. 14, 1992
5094640 Marine engine noise suppressor with swim platform Mar. 10, 1992
4977977 Marine engine external exhaust noise suppressor with swim platform Dec. 18, 1990
4887692 Noise reducing device for marine propulsion Dec. 19, 1989
4799905 Water jacketed exhaust relief system for marine propulsion devices Jan. 24, 1989
4786265 Marine engine exhaust muffler Nov. 22, 1988
4779704 Draining device for muffler of small planing boat Oct. 25, 1988
4744778 Marine engine exhaust muffler with swim platform May. 17, 1988
4714443 Flexible exhaust duct Dec. 22, 1987
4607723 Exhaust system for outboard motors Aug. 26, 1986
4527657 Tapered tube impedance matching underwater voice communicator with bubble silencer Jul. 9, 1985
4527658 Bubble silencer for an underwater voice communicator Jul. 9, 1985
4310067 Optimized diesel engine exhaust silencer Jan. 12, 1982
4284169 Bubble noise reduction Aug. 18, 1981
4167987 Multiple flow marine muffler constructed of resilient material Sep. 18, 1979
4002136 Marine exhaust system Jan. 11, 1977











 
 
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