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| Number | Title | Issue Date |
| 7789195 | Muffler of internal combustion engine A variable muffler corresponds to a muffler of an internal combustion engine including a variable valve that controls the flow of exhaust gas. The variable muffler includes a muffler body forming a muffler chamber, an inlet pipe with an opening at the muffler chambe... | 09/07/2010 |
| 7762374 | Turbine engine diffusing exhaust muffler An exhaust muffler is provided for a turbine engine with at least first and second exhaust outlets. The exhaust muffler includes a first arm configured to be coupled to the first exhaust outlet of the turbine engine. The first arm includes an outer surface, and an i... | 07/27/2010 |
| 7703573 | Ported aerodynamic exhaust tailpipe A tailpipe for use with a vehicle moveable in a forward direction upon a support surface and adapted to be oriented substantially perpendicular to the support surface. The tailpipe includes a windward surface facing in the forward direction and a leeward surface fac... | 04/27/2010 |
| 7562741 | Rear muffler assembly A rear muffler assembly for an internal combustion engine has a first and a second muffler through which exhaust gases flow and which are separated from one another. The first and second mufflers have in each case an exhaust gas delivery and discharge through an exh... | 07/21/2009 |
| 7377359 | Device for modulating noise in a motor vehicle In a device for noise configuration in a motor vehicle which has an internal combustion engine with at least two gas conduits connected to different cylinders of the engine, the gas conduits are interconnected by means of a cross-flow section formed by a housing whi... | 05/27/2008 |
| 7334662 | Equipment enclosure acoustical door with low impedance distributed air flow An acoustic door for an equipment enclosure, such as a rack mount cabinet, also provides a low impedance air flow uniformly delivered across the cabinet opening. A pair of metal panels, with acoustic foam along the rear surfaces, extend angularly outward and toward ... | 02/26/2008 |
| 7325474 | Silencer The present invention relates to a silencer easily cleanable inside. This silencer comprises a casing cylinder and a segment member housed in the casing cylinder to constitute a sound reducing means. The silencer further comprises a segment member fastening means fo... | 02/05/2008 |
| 7318497 | Exhaust device including a resin muffler cover and muffler protector To provide an exhaust device for enhancing the appearance quality, secure the degree of freedom in designing and enhance the cooling performance. An exhaust device in which a second exhaust muffler at a rear portion of an exhaust system extends rearwardly from an en... | 01/15/2008 |
| 7293629 | Exhaust apparatus for small-sized engine An exhaust apparatus has an exhaust pipe that receives exhaust gas from an engine and a muffler attached to the exhaust pipe. The muffler has an exhaust portion that discharges exhaust gas received by the exhaust pipe. A tubular member is attached to the exhaust por... | 11/13/2007 |
| 7293454 | Anti-aliasing acoustic filter in the presence of pulsating flow An exhaust flow measurement system uses a noise attenuation device to cancel exhaust gas pulsations at the harmonic frequency of a flow rate measurement transducer. ... | 11/13/2007 |
| 7228935 | Attachment pin for an exhaust-gas muffler The invention relates to an attachment pin (1) for fixing an exhaust-gas muffler (2) in an apparatus part (4) of a portable handheld work apparatus (5) driven by an internal combustion engine. The exhaust-gas muffler (2) includes e... | 06/12/2007 |
| 7216739 | Muffler for pneumatic hand tool A pneumatic tool (610) and a muffler assembly (600) therefor, for quieting the operation of the pneumatic tool, are disclosed. In one embodiment, the muffler assembly (600) is slidably disposed within the exhaust passage (616) and include... | 05/15/2007 |
| 7159692 | Silencer A silencer that comprises a casing, one or more pipes or passages leading a flow of gas to the casing and a device for leading gas from the casing. The silencer further has at least one internal chamber, one or more flow inlets to the chamber and one or more flow ou... | 01/09/2007 |
| 7117973 | Noise suppressor apparatus for a gas duct A sound damping device (4) for a tubular duct (2), particularly a gas transporting tract of an internal combustion engine (1) having a least one bypass channel (5) running parallel to a main duct (6) in a section of the duct (2 | 10/10/2006 |
| 7073625 | Exhaust gas muffler and flow director Either or both of an exhaust pipe coupled to the output end of an automobile engine collector pipe or the plurality of pipes coupled to the input apertures of the collector pipe from the engine are apertured along their lengths and contained within a further surroun... | 07/11/2006 |
| 7040451 | Automotive exhaust silencer system with variable damping characteristics In a muffler device of a motor vehicle, with a plurality of mufflers and an actuator for changing the flow resistance to the exhaust gases flowing through the mufflers, in order to change the damping characteristic, the actuator is provided in a pipe branch having a... | 05/09/2006 |
| 7004283 | Multiple-chambered exhaust muffler An exhaust gas muffler of multi-chamber construction includes an outer housing having an upper and lower half shell, an inner shell, and an inner exhaust gas duct through the exhaust gas muffler. The inner exhaust gas duct has at lease one curved outlet pipe that ha... | 02/28/2006 |
| 6959782 | Tuned exhaust system for small engines A tuned exhaust system for small two cylinder engines, the exhaust system including a pair of exhaust passage through which exhaust gasses pass. The exhaust passages are dimensioned to providing a tuning effect to the exhaust gasses for enhanced engine performance. ... | 11/01/2005 |
| 6935460 | Noise muffler for oxygen concentrator A noise muffler for the exhaust of waste gases from apparatus such as an oxygen concentrator, including a muffler core with an inlet to receive the waste gases and a plurality of bores in the core first to direct the waste gases through a filter material and a cap e... | 08/30/2005 |
| 6796402 | Muffler having isolated dual flow baffle structure An exhaust that has two isolated baffle systems in one container. This allows the exhaust from one manifold to be muffled and exhausted independently of the other manifold's exhaust. Moreover, the muffler is the same size as existing mufflers, so that it fits into t... | 09/28/2004 |
| 6576028 | Noise abatement device and separation aid for use in fluid flow systems A device to be interposed within the conduit of a fluid flow system to reduce or eliminate the noise associated with such systems. The device is made up of at least two cylindrical chambers, one within the other. The inner chamber is closed at the top, ha... | 06/10/2003 |
| 6470998 | Modular muffler with end plate adaptors and spark arresters A modular muffler that is quickly and easily adapted for use with a wide variety engines is disclosed. The muffler has a dimensionally standardized body member with end portions that may receive any of a number of adaptor end plates provided with various ... | 10/29/2002 |
| 6431311 | Muffler with interchangeable outlet tips A muffler assembly is disclosed allowing one or more outlet tips to be secured to an exhaust. The muffler comprises a casing having an outlet end including threaded holes or threaded bolts attached to the casing, an outlet tip with a tubular member and an... | 08/13/2002 |
| 6382349 | High-performance muffler A muffler for automotive vehicles. The muffler includes a passageway, an inlet at one end of the passageway, and a single outlet or dual outlets at the passageway's other end. The portion of the muffler connected to the inlet is substantially untapered. T... | 05/07/2002 |
| 6382348 | Twin muffler A twin muffler includes two muffling units connected in parallel to the exhaust post of an engine through a manifold, each muffling unit having a front accumulation chamber, a rear accumulation chamber, a perforated inner tube connected between the front ... | 05/07/2002 |
| 6230488 | Exhaust cooling system for vehicles An exhaust gas cooling system for a vehicle includes a cooling fin system retrofit and a side exhaust pipe retrofit having an exhaust gas exit pipe having a first portion having a plurality of mixing portions which are either bends or internal mixing fins... | 05/15/2001 |
| 6152258 | Exhaust system with silencing and water separation capability An exhaust system is provided with a structure that separates water from an exhaust stream and also attenuates the noise of the exhaust system. Water laden exhaust is directed from an inlet conduit through a perforated surface to precipitate water from th... | 11/28/2000 |
| 6141958 | Exhaust cooling system for vehicles An exhaust gas cooling system for a vehicle includes a cooling fin system retrofit and a side exhaust pipe retrofit having an exhaust gas exit pipe having a first portion having a plurality of mixing portions which are either bends or internal mixing fins... | 11/07/2000 |
| 6085863 | Exhaustion pipe structure An exhaustion pipe structure including a hollow tube body, a fitting ring, locking plates, locking screws, an exhaustion fitting pipe and a decoration. The decoration is replaceably fitted with the hollow tube body which is fitted around the exhaustion pi... | 07/11/2000 |
| 6041890 | Exhaust gas muffler for the combustion engine of a portable working tool An exhaust gas muffler for an internal combustion engine of a portable, hand-guided working tool has a housing having an exhaust gas inlet, and exhaust gas outlet, and an outlet space, wherein the exhaust gas outlet opens into the outlet space. An outlet ... | 03/28/2000 |
| 5773770 | Cross flow path exhaust muffler An exhaust muffler includes a housing having a rectangularly shaped hollow interior without fiberglass or other packing. An inlet tube and a first outlet tube extend through one side wall of the housing, and a second outlet tube extends through an opposit... | 06/30/1998 |
| 5731556 | Muffler for pneumatic device A muffler for use with a pneumatic motor the muffler including a housing having a first longitudinal wall, a second longitudinal wall, a first lateral wall, a second lateral wall, and a front wall where the first and second longitudinal walls include an e... | 03/24/1998 |
| 5500494 | System for modifying operation of pneumatic tool Apparatus for use in combination with a compressed air powered tool having an air exit port to modify the sound of the tool during operation. The apparatus includes a helical coil compression spring having a plenum and defining restricted, radially dispos... | 03/19/1996 |
| 5388408 | Exhaust system for internal combustion engines An exhaust system for vehicles and other devices with internal combustion engines such as boats, airplanes, lawnmowers, tractors, and the like, includes a sound attenuating chamber having a single, common opening in an imperforate container providing acce... | 02/14/1995 |
| 5329074 | Marine engine exhaust muffler An exhaust muffler for mounting on the transom of a powerboat in association with the exhaust pipes which extend through the transom. The muffler comprises a housing extending laterally across the stern of the boat and rearwardly from the transom to defin... | 07/12/1994 |
| 5315075 | Exhaust gas muffler for an internal combustion engine The invention is directed to an exhaust gas muffler for an internal combustion engine such as a two-stroke engine for portable handheld tools such as a motor-driven chain saw. The engine includes a cylinder and a piston conjointly defining a combustion ch... | 05/24/1994 |
| 5214253 | Automotive exhaust system An improved automotive exhaust system comprises a flared expansion chamber having two inlet ports at its narrow end and three outlet ports at its wide end. The inlet ports extend a predetermined distance into the chamber to form therein a pair of lips tha... | 05/25/1993 |
| 5183130 | Muffler device for motorcycle A motorcycle covered by a cowl includes a power unit comprising an engine and a power transmission device enclosed by a cover within which an engine fan induces cooling air into heat transfer relation with said engine. A muffler device enclosed by the cow... | 02/02/1993 |
| 5123501 | In-line constricted sound-attenuating system A sound attenuating device is provided for attenuating noise in an exhaust system. The attenuating device includes an inlet end, an outlet end and a constricted portion therebetween. In use, the attenuating device may be disposed in a tubular housing or m... | 06/23/1992 |
| 5097924 | Muffler for a compressed air driven motor A sound absorbing muffler for a compressed air driven motor has first and second mutually confronting end walls connected by four side walls. A pad of sound absorbing material constructed from SAE No. F-7 polyester felt is contained in the muffler housing... | 03/24/1992 |
