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Patent Searching and Data


Matches 901 - 950 out of 14,819

Document Document Title
WO/1993/022763A1
A noise control device which comprises a speaker (3) arranged in the exit of a tail pipe (2) through which noises of the engine of an automobile are given off, the open end of which is at a given angle with respect to the plane vertical ...  
WO/1993/021742A1
A transducer arrangement for audio reproduction comprising: first and second transducer diaphragms (22, 24); first and second coils (40) coupled to said first and second diaphragms (22, 24) respectively; a common magnet structure having ...  
WO/1993/021428A1
An active noise cancellation muffler for automotive and industrial use as shown in the figure comprises a muffler chamber, an internal plate with an attached pipe mounted inside the muffler chamber dividing the muffler chamber into first...  
WO/1993/020667A1
A transducer for use in an active noise cancellation system is particularly adapted for use as a motor vehicle exhaust muffler (12) by physically designing the transducer (32) to optimize magnetic flux with increases in temperature throu...  
WO/1993/020551A1
An active, noise cancellation apparatus for a conduit comprising: a sensor (62) for generating a sensor signal representative of an input pulse train; a first transducer (66) having a front side and a rear side; a second transducer (68) ...  
WO/1993/020341A1
An exhaust system for an internal combustion engine having an exhaust port (14), an exit port (15) and an exhaust chamber (10) communicating between the ports (14, 15), comprising variable dimension means (16) in the exhaust chamber (10)...  
WO/1993/019287A1
This patent application is for a new silencer design with the following features: free (exhaust) gas flow through, which means close to zero back pressure, or head loss; superior acoustic performance, especially in the high- and mid freq...  
WO/1993/018841A1
A ceramic fiber filter media (5) is provided which includes ceramic fiber material and an effective amount of fluid fiber material. Preferably the media also contains therein thermoconductive fiber component. Embodiments are illustrated ...  
WO/1993/012328A1
A silencer has an outer circumferential envelope (1) closed on both sides by bottoms (4). In the bottom (4) located at a greater distance from the inlet (3) is arranged an outlet (5) and inside the circumferential envelope (1) is arrange...  
WO/1993/011347A1
A muffler (1) has an outer casing (4) within which a perforated baffle tube (6) is mounted, the baffle tube (6) having a shut-off valve (8) positioned therein so that the flow of exhaust gases (18) can be directed straight through the ba...  
WO/1993/010339A1
A dynamically variable exhaust system provides for maximum efficiency of an internal combustion engine (30) by including an exhaust control device (35) which is operated by a control mechanism (33) and managed by a control unit (32). The...  
WO/1993/009334A1
In an actively sound dampened muffler, the improvement of a venturi effect area (22) producing means adjacent an aperture (23) in said muffler near which is mounted a loudspeaker (25) in an enclosure (24), the venturi effect area (22) pr...  
WO/1993/007375A1
The device has a generally cylindrical chamber (24) with a fluid inlet (28) in an end wall and a fluid outlet (30) in the sidewall. Fluid introduced into the device via the inlet passes through a venturi (34) before being discharged into...  
WO/1993/006588A1
The description relates to a noise damper through which a fluid is passed. The casing (1) contains sound-absorbing inserts. The sound-absorbing inserts contain corrugted metal sheets (11, 12) instead of fibrous material.  
WO/1993/005282A1
A muffler for muffling noise in a fluid flow, such as exhaust gases from an internal combustion engine comprises a chamber (10), loudspeakers (7) for injecting anti-noise into the chamber under the control of processing circuitry (12) in...  
WO/1992/022738A1
The invention relates to an engine manifold having a plurality of branches connecting respective engine ports to ambient air. Each branch of the manifold is connected to pass through an acoustic coupling (10) formed by a chamber (12) of ...  
WO/1992/019849A1
The invention relates to a device for filtering exhaust gases from internal combustion engines with a casing (1) and devices arranged in the casing (1) for the low-choking guidance and filtration of the exhaust gas flow and a device for ...  
WO/1992/014922A1
A silencer having multiple integrated channels (22) arranged in a labyrinth configuration is provided. The channels (22) have one open end (23) and one closed end with the open end (23) in communication with a common zone (24) which is c...  
WO/1992/009988A1
An acoustic attenuator has at least two masses (102, 103) of sound attenuating material located in a duct (101) with a gas passage provided between confronting surfaces of said at least two masses through which gas is intended to flow fr...  
WO/1992/008881A1
The present invention relates to a motor vehicle muffler comprising an exhaust conduit (4) extending inside a housing and surrounded by filler material, said housing being comprised by two half shells (1, 2). According to the invention, ...  
WO/1992/008053A1
The invention concerns a silencer unit (54) designed as a single module, plus a machine (1) which uses a silencer unit of this kind. Rapid replacement of the silencer unit (54) is possible since it is designed to be detached easily from ...  
WO/1992/008041A1
A muffler device (10) for reducing the noise level of an internal combustion engine as exhaust gases and sound waves produced by the operation of the engine are expelled into the atmosphere is disclosed. The device (10) is placed in the ...  
WO/1992/006284A1
Trap muffler apparatus (242) with bypass to a common reactive acoustic element (250, 270) is disclosed. Bypass structure varies from external bypass to a common acoustic element (250, 270) to annular bypass of the ceramic filter to axial...  
WO/1992/004533A1
A compact, sound-attenuating muffler for an internal combustion engine or the like. The muffler has a divergently tapered partition (36) located near the inlet (26) of the muffler for dividing the exhaust gases into two pulse streams wit...  
WO/1991/015666A1
A noise suppression system for use on internal combustion engines and small enough for use in automotive applications is disclosed. A cancellation noise generator and actuator speakers (50, 52) produce a noise to combine with and cancel ...  
WO/1991/014854A1
The control of noise emanating from engines and their exhaust systems is a difficult problem to overcome in a cost effective way. The noise may be reduced by the introduction of a fluid into the exhaust system such that the fluid is heat...  
WO/1991/013243A1
A control system is described for improving continuous dynamical control on the pressure in the outlet or inlet system (3) or both of a machine (1) in order to control the performance of the machine. The system comprises an actuator (4) ...  
WO/1991/012171A1
A marine exhaust system is provided for separating the gas from the water of gas/water mixture produced by a marine engine, and expelling the gas a sufficient distance from the hull of a boat to place it outside of the turbulent boundary...  
WO/1991/011593A1
An exhaust system (12) includes a muffler (24) having three sections (73, 75, 77) separated by two perforated plates (80, 83). An inlet conduit (23) into the first section (73) of the muffler is conically shaped to force exhaust gases th...  
WO/1991/009214A1
Apparatus to attenuate dynamic pressure fluctuations of a gas flowing in a duct (1) comprises a valve (2) mounted in the duct (1) controllable to vary the cross-sectional area of the duct (1) through which the gas can flow, sensor means ...  
WO/1991/008379A1
An elongate exhaust gas muffler (10) for a turbine engine includes a foraminous central exhaust duct (12) which is circumscribed along its length by a plurality of tuned dissipative and reactive noise attenuation chambers (42-48). At an ...  
WO/1991/007583A1
The device (10) has en entrance (16) and an exit (18) with two low-restriction venturi sections (20, 22) placed in parallel between the entrance and exit. The entering gas flow is separated into two parts, one to pass through one venturi...  
WO/1991/000958A1
An in-line noise attenuation device for insertion into a gas induction system, such as the air induction system of an automotive vehicle internal combustion engine. The device comprises two plastic parts snap-fitted together. One part is...  
WO/1990/014146A1
A sound absorbing muffler (12) for a compressed air driven motor (10) has first and second mutually confronting end walls (28, 34) connected by four side walls (30). A pad of sound absorbing material (52) constructed from SAE No. F-7 pol...  
WO/1990/013108A1
An active sound or vibration control system for compensating noise or vibration arising from a periodic source of changing periodicity, wherein sensors (6) sense the existing noise and vibration, the sensor signals are sampled several ti...  
WO/1990/012950A1
The invention concerns a diesel-soot filter which cleans itself, while operating, by burning off the soot and which has first honeycomb elements (9) with a relatively coarse cell structure and second honeycomb elements (10) with a relati...  
WO/1990/009523A1
The present invention relates to a screw rotor machine which incorporates a sound silencing device in the vicinity of the inlet and/or outlet port. In accordance with the invention, the sound silencing device comprises a Laval-nozzle (8)...  
WO/1990/004706A1
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 tu...  
WO/1990/003501A1
A kit (21) includes a self-contained muffler (20) which attaches to the output exhaust system (12) of a small two-cycle engine (10), such as a model engine that is in the range of .15 to 1.25 cubic inches displacement. The kit (21) provi...  
WO/1990/001109A1
A light-weight and durable silencer not causing secondary pollution and exhibiting a high silencing effect can be obtained by packing or loading a bulky carbon fiber assembly into the main body of the silencer for a combustion exhaust ga...  
WO/1990/000674A1
A light-weight and tough muffler having a high noise deadening effect characterized in that the outer barrel (1) of the muffler is made of a thermotropic liquid crystal polymer. An example of said polymer is a wholly aromatic polyester h...  
WO/1989/012732A1
The exhaust pipe comprises an inner pipe, permeable to gas in radial direction, which is provided with a casing (4) and possibly with a noise-suppressing material (3) such as mineral wool inside the casing. The pipe (2) is produced by ut...  
WO/1989/012733A1
An exhaust silencer comprises an inner, flexible pipe (2), an outer casing (4) and a noise-suppressing material (3) between the pipe (2) and the outer casing (4). The casing comprises a strip (41) wound helically with partial overlap. A ...  
WO/1989/008771A1
The silencer comprises a tubular envelope (7) supported by an end-piece (10) for fixture to a gas supply source in which the pressure is to be reduced. A perforated plate (8) and a disc (9) close off the ends of the envelope which is dri...  
WO/1989/007701A1
An active sound attenuation system for combustion engine exhaust systems and the like is disclosed. The system includes counter-noise acoustic wave generators (19) that are protected from the environment of a medium propagating undesirea...  
WO1989003472A3  
WO1989001566A3  
WO/1989/003472A2
The device reduces the intensity of noises with localized outlet like those present in the exhaust pipes of endothermic motors, making use of sound-interferences determined by an elastic vibration by means of springs (10) or (12) or (15)...  
WO/1989/002778A1
The exhaust system is suitable for both petrol and diesel engines, whether used for vehicle propulsion or in permanently installed power transmissions, and controls emission by trapping the solid matter and unburned hydrocarbons that esc...  
WO/1989/001566A2
A particulate filter module, comprising: a ceramic filter element (104) having opposite ends and a longitudinal side region therebetween; a rigid housing (108) for enclosing said side region of said filter element, said housing including...  

Matches 901 - 950 out of 14,819