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| Number | Title | Issue Date |
| 4398563 | Multi-tube flow restrictor A fluid flow restrictor for spanning a passage of a body to minimize noise and cavitation in a high pressure fluid flowing through the passage and undergoing a substantial pressure drop in passing through the restrictor. The device comprises at least one ... | 08/16/1983 |
| 4392549 | Boiler noise suppressor A boiler noise suppressor has one truss (2) mounted on a cover of an inlet flange (1), a perforated expansion nozzle (5), a pipe system (7) made of a several hundreds of pipes, a perforated outlet nozzle (8), at least one truss (11) mounted on a collar of... | 07/12/1983 |
| 4362223 | Sound absorbing device Apparatus for damping a sound field propagating in a fluid propagation medium within a channel (1) having a closed cross-section periphery, including at least one but preferably a plurality of lattice members (2) spaced within the channel (1), each of the... | 12/07/1982 |
| 4359134 | Sound suppressor for fluid flow lines A compact low-resistance muffler for reducing sound levels generated by the pulsatile flow of fluids as, for example, at the intake of a compressor or the exhaust port of an internal combustion piston engine. The muffler or suppressor comprises a pair of ... | 11/16/1982 |
| 4354573 | Silencer for motorcycle A tail cap of a silencer for a motorcycle which is so constructed that a plurality of kinds of tail cap, each having different shape and construction, are provided, which is interchangeably mounted and dismounted to and from the tail part of the silencer ... | 10/19/1982 |
| 4315559 | Muffler for internal combustion engine A muffler for internal combustion engines and comprising a housing having an inlet passageway for admitting exhaust gases into the interior of the housing and an outlet passageway for discharging the exhaust gases from the housing, the interior of the hou... | 02/16/1982 |
| 4313522 | Static pressure regain coupler for an air distribution system A static pressure regain coupler for coupling an input duct and the upstream end of a branch take-off device having a main duct and one or more channel. The static pressure regain (SPR) coupler includes an upstream end which has substantially the same cro... | 02/02/1982 |
| 4310067 | Optimized diesel engine exhaust silencer An exhaust silencer system for piston type internal combustion engines hag a wet-exhaust, having a muffler and a muffler bypass which contains water at slow and moderate engine speeds, the water being expelled by the exhaust gas pressure at high engine s... | 01/12/1982 |
| 4301652 | Exhaust gas purification apparatus for motor vehicles A device is disclosed for treating exhaust gases from an internal combustion engine having a gas inlet adapted to be connected to the exhaust of the internal combustion engine and a plurality of serially arranged interconnected reaction chambers. The firs... | 11/24/1981 |
| 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 |
| 4222456 | Sound-suppressing and back pressure-reducing apparatus and method This invention is directed to an apparatus and method for treating a flowing gas so as to decrease the back pressure of the flowing gas and the noise of the flowing gas.... | 09/16/1980 |
| 4220219 | Lightweight muffler and method for muffling noise A lightweight muffler and method for muffling a noise component of a stream of gases is disclosed. The muffler includes a chamber in which gases are directed side-by-side streams flowing in opposite directions. The streams are in contact with each other f... | 09/02/1980 |
| 4212369 | Sound-absorbing covering, especially radiator covering for motor vehicles A sound-absorbing covering, especially a radiator covering for motor vehicles whose air channel is adapted to be traversed by a gaseous medium in a direction opposite to the direction of travel of the sound; at least one section of a channel wall of the a... | 07/15/1980 |
| 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 |
| 4204586 | Silencer on the intake side of a compressor with assembly of axially spaced annular sound-damping elements A silencer construction for connection to the intake side of a compressor comprises an assembly of axially spaced annular sound damping elements which form air in-flow passages therebetween. The sound damping assembly is located in a radially outer annula... | 05/27/1980 |
| 4203502 | Muffler A muffler for an internal combustion engine utilized on a motorcycle or the like. The muffler provides the necessary silencing action while being defined to be light in weight, small and pleasing in appearance. The exhaust gases are subdivided into a plur... | 05/20/1980 |
| 4202426 | Exhaust gas splitter construction Splitter type exhaust silencers are improved by providing means for preventing dust particles from depositing upon sound deadening fibers exposed to the dust carrying exhaust gas stream by providing a dust-free boundary layer gas stream to flow protective... | 05/13/1980 |
| 4192401 | Complete louver flow muffler A muffler for reducing the audible noise level of exhaust gases emitted by combustion engines has an inlet tube with a patch of louvers or perforations and is arranged so that all or substantially all the gas flowing through the muffler is forced through ... | 03/11/1980 |
| 4192403 | Muffler for internal combustion engines A muffler for internal combustion engines having the interior of an expansion chamber sectioned by a porous plate through which an exhaust inlet pipe is extended. The inlet pipe is closed at its down-stream end and is provided with many perforations in th... | 03/11/1980 |
| 4186819 | Exhaust system for a two-stroke engine A hollow, generally conical member is provided in a cylindrical portion of a muffler shell and has a surface cooperating with the shell to compress oncoming exhaust gases, the surface being of a special curved configuration calculated for reflecting impin... | 02/05/1980 |
| 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 |
| 4182430 | Branch take-off and silencer for an air distribution system A branch take-off and silencer apparatus for an air distribution system. The apparatus couples an input duct to one or more branch ducts and to a coaxial output duct having a similar but smaller cross-section than the input duct. Coaxial extensions of the... | 01/08/1980 |
| 4180141 | Distributor for gas turbine silencers Gas turbine exhaust quieting means wherein the low frequency noise which is normally generated by turbulence in the gas turbine exhaust, is suppressed by means of a turbulence suppressing flow distributor. Said flow distributor comprising an elongated, ho... | 12/25/1979 |
| 4165798 | Muffler for internal combustion engine A muffler comprises a plurality of stackable stages 1, 2 and 3. Each stage is comprised of a phase opposition circuit. In each phase opposition circuit exhaust gases are divided into two paths towards an outlet where they are recombined. The difference in... | 08/28/1979 |
| 4133479 | Exhaust gas muffler for an internal combustion engine An exhaust gas muffler for an internal combustion engine. The muffler designed to increase back pressure to the engine within acceptable manufacturer limits and increase the frequency of the sound of the exhaust gas so that the acoustic energy is more eas... | 01/09/1979 |
| 4130173 | Apparatus and method for reducing flow disturbances in a flowing stream of compressible fluid Disclosed are methods and apparatus for reducing acoustic noise generated by high pressure ratio throttling of compressible fluids. High pressure gas is passed through a plurality of chokes, each adapted to cause an incremental pressure reduction and prod... | 12/19/1978 |
| 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 |
| 4113051 | Engine muffler and spark arrester A muffler and spark arrester for use on an internal combustion engine has an outer tube extending along an axis between an inlet and an outlet. A perforate inner tube is disposed coaxially within the outer tube and merges therewith adjacent the inlet and ... | 09/12/1978 |
| 4113050 | Fluid-flow noise reduction systems An `in-line` unit for use in compressor station piping, arranged to reduce the level of noise generated when the blowdown valves of the station piping are opened in an emergency to vent the high pressure gas therein to atmosphere, the unit comprising a pi... | 09/12/1978 |
| 4108274 | Acoustical apparatus An apparatus for reducing acoustical pressure in a tubing is disclosed comprising a first molded plastic member having a first support with an orifice extending therethrough and having a first side forming a substantially saucer shaped member. A plurality... | 08/22/1978 |
| 4105089 | Flow distributor for gas turbine silencers Gas turbine exhaust quieting means wherein the low frequency noise which is normally generated by turbulence in the gas turbine exhaust, is suppressed by means of a turbulence suppressing flow distributor. Said flow distributor comprising an elongated, ho... | 08/08/1978 |
| 4076099 | Device for reducing engine exhaust noise An attenuator for reducing exhaust noise in engines is provided which includes an exhaust pipe having a flared outlet and a frustoconically shaped attenuator member mounted therein. In an alternate embodiment, vents are provided to increase efficiency. In... | 02/28/1978 |
| 4067361 | Silent self-controlled orificial restrictor An orificial restrictor for use in a ballasting system for an underwater icle utilizing a plurality of multi-holed orifice plates set in series within a casing. A hollow cylinder is slidably positioned within the casing and carries fluid supplied through... | 01/10/1978 |
| 4056934 | After-burning preventive and flame-out apparatus For use in a muffler of an internal combustion engine improved flame-out apparatus includes first and second L-shaped screens each having a longitudinal section and a transverse section. The transverse sections are axially spaced apart and the space there... | 11/08/1977 |
| 4050539 | Exhaust apparatus for internal combustion engine An exhaust apparatus for internal combustion engines comprises an outer pipe having an enlarged intermediate portion and at least one end portion having nearly the same diameter as the exhaust pipe from the engine for connection thereto, an inner pipe of ... | 09/27/1977 |
| 3966015 | Silencer element A wave interference silencer includes a sealed envelope having an inlet and an outlet in communicaton with an exhaust flow volume therebetween which is divided into a plurality of compartments by spaced apart intermediate wall portions each having an exha... | 06/29/1976 |
| 3964570 | Silencer for combustion engines A silencer for relatively low horsepower combustion engines is constructed with two separate sections in series through which exhaust gases pass. The upstream section has two concentric perforated tubes within an imperforate jacket with exhaust openings f... | 06/22/1976 |
| 3963092 | Exhaust muffler for competition car engines An exhaust muffler for competition car engines has a cylindrical, outer or main shell with an inlet at one end smaller than or the same diameter as the main shell and with an outlet at the other end smaller in diameter than the main shell. Inside the main... | 06/15/1976 |
