|
| US4102393 | 17 Sep 1976 | 25 Jul 1978 | UOP Inc. | Heat exchange apparatus |
| US4348862 | 9 Jan 1981 | 14 Sep 1982 | Kawasaki Jukogyo Kabushiki Kaisha | Exhaust system for a two-cycle engine |
| US4371053 | 12 Mar 1981 | 1 Feb 1983 | Hills Industrie Limited | Perforate tube muffler |
| US4683884 | 11 Apr 1986 | 4 Aug 1987 | MD Engineering | Noise attenuating smokeless surgical device |
| US4690245 | 14 Nov 1986 | 1 Sep 1987 | Stemco, Inc. | Flattened venturi, method and apparatus for making |
| US5123501 | 21 Oct 1988 | 23 Jun 1992 | Donaldson Company, Inc. | In-line constricted sound-attenuating system |
| US5173576 | 24 Dec 1990 | 22 Dec 1992 | Feuling Engineer, Inc. | Muffler for an internal combustion engine |
| US5530214 | 20 Sep 1994 | 25 Jun 1996 | The United States of America as represented by the Secretary of the Navy | Venturi muffler |
| US5590688 | 8 Mar 1995 | 7 Jan 1997 | Neles-Jamesbury Oy | Device provided with a gas flow channel to reduce noise caused by throttling a gas flow |
| US5902970 | 17 Apr 1997 | 11 May 1999 | | Muffler for internal combustion engines, especially in aviation of improved geometry and material |
| US6347609 | 28 Sep 2000 | 19 Feb 2002 | Siemens Canada Limited | Wedge section multi-chamber resonator assembly |
| US7549509 | 21 Apr 2005 | 23 Jun 2009 | Ingersoll-Rand Company | Double throat pulsation dampener for a compressor |
| US7600607 | 17 Nov 2005 | 13 Oct 2009 | | Flow-through sound-cancelling mufflers |
| US7610993 | 26 Aug 2005 | 3 Nov 2009 | | Flow-through mufflers with optional thermo-electric, sound cancellation, and tuning capabilities |
| US7845465 | 28 Aug 2008 | 7 Dec 2010 | Tenneco Automotive Operating Company Inc. | Vehicular exhaust resonator with cooling feature |
| US7857095 | 13 Nov 2007 | 28 Dec 2010 | Yuguang Zhang Zhongqiang Zhang | Device with trace emission for treatment of exhaust gas |
| US8210309 | 25 Sep 2008 | 3 Jul 2012 | Parallaxial Innovation LLC | Channeling gas flow tube |