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| Number | Title | Issue Date |
| 8056673 | Sound dampening and wear protecting flapper configuration for marine exhaust system Disclosed are apparatus and methodology for reducing noise and wear in a flapper configured exhaust tip for a marine exhaust system. A metallic flapper is located at an end portion of an exhaust tip of the exhaust pipe. An elastomeric flapper assembly is provided co... | 11/15/2011 |
| 7921964 | Method and apparatus for altering and/or minimizing underwater noise To reduce or eliminate the startle response in aquatic life, embodiments of the present invention alter the sound produced by a diver's exhaled bubbles by adjusting up or down the frequency of the sound produced by the bubbles. ... | 04/12/2011 |
| 7913809 | Flapper configuration for marine exhaust system Disclosed are apparatus and methodology for reducing noise and wear in a flapper configured exhaust tip for a marine exhaust system. A flapper, normally located within an exhaust tip of a marine exhaust system, is relocated upstream of the point in the exhaust syste... | 03/29/2011 |
| 7886870 | Exhaust apparatus for small boat An exhaust apparatus for a small boat for reducing exhaust noise. A water muffler is provided at a midsection of the exhaust pipes extending from an engine which is provided in a boat body. An interior of the water muffler is partitioned into an expansion chamber an... | 02/15/2011 |
| 7234663 | Bubble cloud acoustic damping for launch vehicle fairing A launch vehicle payload fairing incorporating hollow cavities filled with an aerated fluid for the reduction of acoustic noise during launch. The fairing may also include a fluid ejection system for subsequent weight reduction. ... | 06/26/2007 |
| 7217168 | Engine exhaust system An engine exhaust system has an exhaust gas passage and a coolant passage. The coolant passage surrounds at least a portion of the exhaust passage. The system is also equipped with an exhaust conduit, which mixes exhaust gases and coolant and then releases the mixtu... | 05/15/2007 |
| 7131514 | Noise attenuation device for a vehicle exhaust system A noise attenuation device for a vehicle exhaust system is provided. The device includes an exhaust pipe having a passageway for receiving exhaust gas pulses from an engine. The device further includes a plurality of vanes extending from an inner surface of the pass... | 11/07/2006 |
| 7104359 | Muffler having a baffle with angled plates A muffler having a baffle with angled plates includes a one piece baffle, a container and two end caps. The one piece baffle has at least three different configurations. The baffle preferably has two, three or four plates, namely “V”, “Z” or “W” shapes. ... | 09/12/2006 |
| 7086498 | Noise attenuation device for a vehicle exhaust system A noise attenuation device for a vehicle exhaust system is provided. The device includes an exhaust pipe having a passageway for receiving exhaust gas pulses from an engine. The device further includes a plurality of vanes extending from an inner surface of the pass... | 08/08/2006 |
| 7052343 | Personal watercraft A personal watercraft is disclosed. The personal watercraft typically includes a body formed by a hull and a deck covering the hull from above and having an inner space defined by the hull and the deck, an engine accommodated in the inner space of the body, and an e... | 05/30/2006 |
| 6564901 | Muffler for marine engine A marine engine muffler is provided having a silencing element with an inclined surface defining an array of elongate slotted apertures generally disposed in circumferential alignment. The slotted apertures are preferably defined by angled sidewalls such ... | 05/20/2003 |
| 6412595 | Economical exhaust muffler system for a marine propulsion apparatus A muffler is provided for a marine propulsion system in which an initial portion causes a downward flow of exhaust gas and entrained water from an exhaust manifold. The transition section directs the exhaust gas toward an egress section which extends upwa... | 07/02/2002 |
| 5969300 | Wet marine exhaust muffler A wet marine exhaust muffler includes a metallic housing and a polymeric jacket substantially encapsulating the metallic housing. The metallic housing defines one or more chambers in the interior of the housing. An inlet pipe and an outlet pipe each exten... | 10/19/1999 |
| 5824970 | Marine engine silencer having internal apertured baffle and weir plate A silencer is provided for a marine diesel engine. The silencer comprises a conical silencer element (20) located within an exhaust duct (10), the silencer element having apertured surfaces which are inclined to the flow of exhaust gases in the duct.... | 10/20/1998 |
| 5719358 | Arrangement for muffling the exhaust sound of a boat motor A muffler for muffling the exhaust sound of a motor boat having a diesel motor. The exhaust gases of the motor are led to a buffer chamber that is located beneath the waterline of the boat and mounted on a trim tab fitted to the transom of the boat. The b... | 02/17/1998 |
| 5625173 | Single baffle linear muffler for marine engines An improved muffler for silencing the exhaust emitted from a water cooled marine engine employing a first outer housing encompassing a generally cone shaped inner member and forming a silencing volume therebetween and an angularly disposed inner planar ba... | 04/29/1997 |
| 5616893 | Reverse entry muffler with surge suppression feature An improved muffler for silencing the exhaust emitted from a marine engine employing a reverse entry inlet conduit, an attenuation chamber and an outlet conduit whereby exhaust gas and liquid is communicated through the inlet conduit and into the attenuat... | 04/01/1997 |
| 5594217 | Exhaust muffler for small marine craft An exhaust muffler for small marine craft that can be located in the rear portion of the bilge and straddle the drive shaft and the shaft log. The muffler has a shell formed from sides, ends, top and bottom walls. The bottom wall is provided with a concav... | 01/14/1997 |
| 5588888 | Wet marine exhaust muffler A wet marine exhaust muffler comprises a housing, an inlet pipe and an outlet pipe. The housing includes end walls each transverse with respect to an imaginary plane and converging side walls connecting converging edges of the end walls such that the conv... | 12/31/1996 |
| 5561276 | Two-phase-flow muffler in a rotating shaft A muffler is described for use in connection with an exhaust passage in a ongated shaft rotating about a longitudinal axis. The shaft exhausts exhaust material generated by an internal or external combustion engine, having both a gaseous and a liquid mate... | 10/01/1996 |
| 5550337 | Exhaust system for a small planing craft An exhaust silencing system for a small planing craft includes a first expansion chamber housing on one side of a water craft which transmits exhaust gases and waste cooling water to a second expansion chamber housing which may have a number of expansion ... | 08/27/1996 |
| 5504280 | Muffler for marine engines An improved muffler for silencing the exhaust emitted from a water cooled marine engine comprising a housing enclosure having a corrugated spacing means disposed within the housing partitioned by an angularly disposed inner planar baffle, the housing havi... | 04/02/1996 |
| 5444196 | In line insertion muffler for marine engines An improved muffler for silencing the exhaust emitted from a water cooled marine engine employing a first housing encompassing a second housing which is partitioned by an angularly disposed inner planar baffle further having an inlet for exhaust gas and c... | 08/22/1995 |
| 5442148 | Exhaust muffler for outboard motors An exhaust muffler for outboard motors which is fastened to the rear end of the propeller hub and directs the motor's exhaust back into the hub of the propeller and out through the front of the propeller and the by-pass exhaust ports of the motor. The muf... | 08/15/1995 |
| 5374209 | Internal combustion engine exhaust system An outboard motor comprising a propulsion unit including a propeller shaft, and an internal combustion engine drivingly connected to the propeller shaft and including a V-shaped cylinder block having first and second cylinder banks including respective fi... | 12/20/1994 |
| 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 |
| 5326942 | Noise suppression muffler for moisture laden exhaust gases & method A muffler is provided for sound dampening of wet exhaust gases. The muffler comprises a canister, or housing, having an inlet and an outlet. The housing is preferably constructed of a plurality of resealable interlocking sections which can be disengaged f... | 07/05/1994 |
| 5306184 | Outboard engine exhaust system A muffler for an exhaust system of an outboard engine is constructed in two parts, one being longer than the other with the longer portion being of standard length for various engine applications, while the shorter length muffler section is constructed to... | 04/26/1994 |
| 5262600 | In-line insertion muffler for marine engines An improved muffler for silencing the exhaust emitted from a water cooled marine engine employing a first housing encompassing a second housing which is partitioned by an angularly disposed inner planar baffle further having an inlet for exhaust gas and c... | 11/16/1993 |
| 5253603 | Underwater vehicle muffler A muffler for use with an underwater vehicle. The muffler is mechanically attached to an exhaust tube or aft end of the underwater vehicle and has an hydrodynamic shape and perforated exterior that results in the production of less noise by the vehicle. L... | 10/19/1993 |
| 5196655 | Muffler for marine engine An improved muffler for silencing the exhaust emitted from a water cooled marine engine comprising a housing enclosure partitioned by an angularly disposed inner planar baffle, the housing having an inlet for the exhaust gas and cooling water to fluidly c... | 03/23/1993 |
| 5106330 | Exhaust relief system with baffle The invention provides a marine propulsion device comprising a powerhead including an exhaust gas discharge port, a gearcase rotatably supporting a propeller shaft connected to the powerhead and including an exhaust gas discharge, and a lower unit includi... | 04/21/1992 |
| 5103931 | Exhaust silencing means for marine propulsion A number of embodiments of internal combustion engine exhaust systems each of which is effective to provide good silencing for exhaust gases through the use of an elastic diaphragm that dampens pulsations. In some embodiments, this elastic diaphragm forms... | 04/14/1992 |
| 5094640 | Marine engine noise suppressor with swim platform Sound muffling devices for marine engines for installation on the external portion of the transom of a marine vessel are attached in such a manner that any breakdown within the silencer causes no discharge of exhaust gases or cooling fluids into the inter... | 03/10/1992 |
| 4977977 | Marine engine external exhaust noise suppressor with swim platform Sound muffling devices for marine engines for installation on the external portion of the transom of a marine vessel are attached in such a manner that any breakdown within the silencer causes no discharge of exhaust gases or cooling fluids into the inter... | 12/18/1990 |
| 4887692 | Noise reducing device for marine propulsion A number of embodiments of silencing devices for marine propulsion units using acoustical lenses that are positioned across either the air inlet device, the air exhaust device or both. The acoustical lenses direct the sound waves in such a way so as to ef... | 12/19/1989 |
| 4799905 | Water jacketed exhaust relief system for marine propulsion devices Disclosed herein is an inner exhaust gas housing adapted to be located within a drive shaft housing of an outboard motor, which inner exhaust gas housing integrally includes an open upper end, a first exhaust passage extending downwardly from the upper en... | 01/24/1989 |
| 4786265 | Marine engine exhaust muffler An exhaust muffler for mounting on the transom of an inboard or inboard/outboard motorboat around the exhaust pipes which extend from the transom. The muffler comprises a housing which has a pair of sidewalls each adjacent to one of the sides of the boat,... | 11/22/1988 |
| 4779704 | Draining device for muffler of small planing boat A draining device for a muffler of a small planing boat in which engine cooling water is injected into the muffler. A draining hole is opened in the muffler, and to aforesaid draining hole is connected one end of a bypass hose with the other end opened to... | 10/25/1988 |
| 4744778 | Marine engine exhaust muffler with swim platform An exhaust muffler for mounting on the transom of an inboard or inboard/outboard motor boat over the exhaust pipes which extend through the transom includes a top which forms a swim platform. The muffler comprises a housing which has a pair of sidewalls e... | 05/17/1988 |
