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| Number | Title | Issue Date |
| 5449866 | Arrangement for damping sound in a pipe system The invention relates to a sound-damping arrangement in a passageway system or pipe system for flowing gases, in particular in an exhaust system for internal combustion engines. The arrangement comprising at least one pipe which communicates with at least... | 09/12/1995 |
| 5349141 | Resonator type silencer having plural resonance chambers A resonator type silencer installed in an intake system of an automotive internal combustion engine. The resonator type silencer comprises a generally cup-shaped base member integrally connected with an air duct through which intake air to be inducted int... | 09/20/1994 |
| 5302783 | Resonator In general, sound resonators or mufflers are bulky self-contained metal bodies, which are expensive to produce and to install in an engine intake or exhaust system. A relatively simple substitute, which can be tailor made to attenuate sound at various fre... | 04/12/1994 |
| 5276291 | Acoustic muffler for high volume fluid flow utilizing Heimholtz resonators with low flow resistance path A compact resonating muffler is disclosed. Specifically, the muffler is a part of a duct which is preferably rectilinear with an aspect ratio in the order of 3 to 1. The muffler contains at least two and preferably three or more rows or lines of Helmholtz... | 01/04/1994 |
| 5229557 | Rigidified muffler assembly The invention relates to a rigidifying structure used to support half shells of a stamp-formed muffler by connecting at least one of the half shells to an inner plate disposed in the space between the half shells so that shell noise is minimized.... | 07/20/1993 |
| 5227593 | Muffler assembly for engine Muffler assembly for an engine comprises an outer cylinder constituting a muffler body, an inner cylinder coaxially disposed in the outer cylinder, a connection cylinder disposed inside the inner cylinder having one end on an upstream side and another end... | 07/13/1993 |
| 5196653 | Muffler for air powered turbine drive A muffler for an air powered turbine drive includes a cone section made of perforated metal, a plurality of layers of sintered material on the inner surfaces of the cone section, an inner housing section substantially surrounding the cone section, an inne... | 03/23/1993 |
| 5187334 | Acoustic muffler with one-piece housing A muffler of the type used to attenuate exhaust gas noise in exhaust systems of automobiles, trucks, or the like, particularly characterized by a gas flow conduit which is axially slotted and laterally flattened to form a closure and a pair of openings ax... | 02/16/1993 |
| 5183976 | Adjustable sound attenuating device An adjustable sound attenuating device comprised of an elongated outer main shell of a predetermined diameter, with an inlet coupling and an outlet coupling. The device has located within the shell singular or multiple independent baffle components compri... | 02/02/1993 |
| 5168132 | Exhaust gas muffler An exhaust gas muffler comprises a double-walled casing having an inlet end receiving a stream of the exhaust gas and an outlet end for the exhaust gas, the outlet end comprising an outer tube surrounding a perforated inner tube spaced therefrom, and the ... | 12/01/1992 |
| 5106397 | Air cleaner/noise silencer assembly The invention relates to an air cleaner comprising a generally bell-shaped air cleaner housing and a generally frustoconical filter positioned concentrically within the housing. The housing has an air inlet at its small end and an air outlet at its large ... | 04/21/1992 |
| 5004068 | Muffler A muffler is constructed to have a tubular perforated plate within its cavity so as to divide the cavity into an outer resonant cavity and an inner resonant cavity, to thereby provide two resonant frequencies. The tubular perforated plate is formed in the... | 04/02/1991 |
| 4941545 | Muffler assembly A muffler assembly includes a pair of outer shells mating to define a muffler chamber and a pair of internal tuning plates mating to define inlet and outlet tubes in the muffler chamber. Drop-in baffles are used to divide the muffler chamber into an expan... | 07/17/1990 |
| 4892168 | Noise attenuating device A resonator used in an exhaust system of an automotive internal combustion engine. The resonator defines therein a resonance chamber and provided with an exhaust gas inlet tube through which exhaust gas is introduced into the resonator. An exhaust gas out... | 01/09/1990 |
| 4874062 | Muffler A muffler comprising a casing, a defining member for defining at least two resonance chambers in the casing, and a pipe for flowing a gas therethrough. Each of the resonance chambers has a different resonance frequency, and the pipe is communicated with e... | 10/17/1989 |
| 4836330 | Plural chamber stamp formed muffler with single intermediate tube A stamp formed muffler comprising a pair of internal plates and a pair of external shells is provided. The internal plates are stamp formed to define first and second spaced apart arrays of tubes and a single intermediate tube therebetween. Tubes in one a... | 06/06/1989 |
| 4751980 | Sound attenuation apparatus A sound attenuation apparatus which is to be connected to an airflow duct and is to receive the air from the duct. The sound attenuation apparatus includes a mass of plates located in a stacked arrangement with peripheral gaps being formed between the pla... | 06/21/1988 |
| 4607723 | Exhaust system for outboard motors Two embodiments of outboard motors incorporating improved silencing systems for the exhaust gases of the powering engine. In each embodiment, a Helmholtz resonator is provided by a resonance chamber formed at least in part by a spacer plate that is interp... | 08/26/1986 |
| 4595073 | Plug-type muffler section A plug section for a muffler, including an outer body and having an inlet pipe for introducing exhaust gas into the body. The inner end of the inlet pipe located within the body portion is closed off. Surrounding the inlet pipe is a conical baffle having ... | 06/17/1986 |
| 4326600 | Intake silencer for outboard motor An outboard motor includes a cowling with a cavity that receives a carburetor that supplies the engine with an air/fuel mixture. The carburetor has an air intake port. An air intake passage connects to this port, and bends partway around the carburetor. A... | 04/27/1982 |
| 4314621 | Fluidborne noise attenuator A fluidborne noise attenuator (14) comprises a dampening medium (27) which exhibits a bulk modulus (e.g., 50,000 psi to 180,000 psi) substantially greater than that of an inert gas, such as nitrogen, and substantially less than that of a hydraulic working... | 02/09/1982 |
| 4287962 | Packless silencer The construction described is a resistive sheet type of duct liner or duct silencer; i.e., a liner or silencer in which acoustical flow resistance is concentrated in a thin face sheet separating the flow passage and acoustical cavity rather than in an aco... | 09/08/1981 |
| 4236598 | Rotating self-cleaning sound absorber for ducts A sound absorbing structure for a flow duct composed of a bundle of parallel, terminated, acoustical waveguides. The bundle of waveguides is cut obliquely so that the individual waveguides vary substantially in length along the cut. The bundle is arranged... | 12/02/1980 |
| 4212370 | Sound absorber for an intermittently discharged gaseous working medium A sound absorber for intermittent exhaust gas, particularly for use in connection with a compressed air operated motor employed, for example, in a hand grinder. The sound absorber is arranged predominantly in the housing of the motor and includes an exhau... | 07/15/1980 |
| 4185715 | Sound-attenuating muffler for exhaust gases A sound-attenuating muffler for reducing the acoustic energy in an exhaust gas stream has an elongated cylindrical housing with a small ratio of diameter to length. Axially extending vanes are radially disposed to define an added number of flow passages. ... | 01/29/1980 |
| 4177875 | Muffler for internal combustion engine A muffler for an internal combustion engine includes a cylindrical casing having end plates closing the interior thereof. At least one baffle extending perpendicularly to the central axis of the casing is provided for dividing the interior of the casing i... | 12/11/1979 |
| 4128769 | Eductor muffler A gas turbine engine exhaust duct of combination circular and rectangular configuration, and accompanying muffler which provides cooling and silencing of exhaust flow from the gas turbine engine. The arrangement utilizes minimum space without sacrifice of... | 12/05/1978 |
| 4125171 | Exhaust gas silencer An exhaust gas silencer having a casing including gas inlet and exhaust passages, a plurality of baffle plates having inner portions together defining a central chamber constituting one of said passages and extending longitudinally of the casing, and oute... | 11/14/1978 |
| 4102359 | Noise suppressor A noise suppressor for reducing noise resulting from venting of large volumes of high pressure gas. A first pipe member has an open first end, adapted for attachment to a high pressure gas outlet, and a closed second end. A plurality of second pipe member... | 07/25/1978 |
| 4023645 | Method and apparatus for reducing aerodynamic whistle Means and methods for prevention of undesirable acoustical whistles in mufflers or silencers of inexpensive and convenient design are shown. The broad inventive concept is that of preventing extended smooth flow of gas within a perforated tube, and this i... | 05/17/1977 |
