Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 4924966 | Muffler A muffler has a muffler body within which is located an intermediate duct pipe colinear with the exhaust and tail pipes, so that exhaust gas from the exhaust duct pipe can pass through a main flow route in the intermediate duct pipe in a substantially str... | 05/15/1990 |
| 4762540 | Noise suppression and particle separation apparatus for high pressure gaseous fluid flows Noise suppression and particle separation apparatus for flows of high pressure, high velocity, particle-laden, gaseous fluid, such as geothermal steam, comprises a gaseous fluid conduit that has axially installed around its discharge end a larger diameter... | 08/09/1988 |
| 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 |
| 4712643 | Particulate trap exhaust muffler A particulate trap exhaust muffler for use with a diesel engine and comprising a casing having an internal wall dividing the casing into an inlet chamber and an outlet chamber. The wall is formed with a plurality of openings and a plurality of generally p... | 12/15/1987 |
| 4655317 | Sound damping device, preferably for reducing the noise of blow-off valves A sound damping device for suppressing the noise generated by a gas stream emitted by a blow-off valve includes a body of a porous, resiliently readily compressible material traversed by the gas stream and a nipple projecting into the body and having a pa... | 04/07/1987 |
| 4628689 | Internal combustion engine exhaust system An exhaust system for the internal combustion engine of an automotive vehicle comprises a diecast housing of an aluminum-magnesium-silicon alloy in the form of a boxlike housing part provided with a removable cover affording access to a replaceable rectan... | 12/16/1986 |
| 4346781 | Lined-duct acoustic filter A lined duct is divided into two parallel branches by means of a rigid partition. The phase speed of the fundamental mode in each branch depends on the liner configuration and can differ markedly from the free-space phase speed. When the liners in the two... | 08/31/1982 |
| 4335797 | Noise suppression arrangement for engine enclosures An engine enclosure (10) has a noise suppression arrangement (15,15a,15b) mounted thereon including a plurality of acoustical energy absorbers (20,20a,20b) and sound reflectors (24,24a,24b) spaced from the absorbers to provide airflow passages (26,26a,26b... | 06/22/1982 |
| 4316522 | Acoustic filter silencer A sound silencer for insertion in a duct having a fluid medium flowing therethrough includes an outer housing having an open entry end, an open exit end, a base portion, a roof portion, and a pair of opposed sidewalls. The silencer further includes a plur... | 02/23/1982 |
| 4302225 | Hand vacuum cleaner A hand vacuum cleaner includes a housing having an inlet and an outlet, and a front and a rear part connectable with each other so as to constitute the housing. The housing has a front face and a rear face spaced from the inlet in the flow direction of in... | 11/24/1981 |
| 4282950 | Muffler The invention refers to a silencer or muffler for internal combustion engines, particularly for two-stroke or cycle internal combustion engines, comprising at its inlet an essentially frustoconical diffusor, a shell of a truncated cone immediately adjoini... | 08/11/1981 |
| 4281742 | Silencer for exhaust gases This invention relates to a silencer for muffling the flow of exhaust gases from an engine before they enter the atmosphere. This silencer comprises a tubular housing having an absorption section with an inlet and an outlet opening. The absorption section... | 08/04/1981 |
| 4252212 | Muffler for combustion engines The muffler has an inner exhaust gas pipe and an outer casing. The inner pipe has a diameter which expands conically by about 6% between the input to the output ends of the casing. The inner pipe is also provided with longitudinal wall slots measuring abo... | 02/24/1981 |
| 4219100 | Muffler for exhaust air or other gas Exhaust air from an air tool or other air actuated device is directed into an air expansion chamber separated by slots from a second chamber containing a predetermined volume of small unconnected particles, such as small pellets of reground plastic scrap ... | 08/26/1980 |
| 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 |
| 4162904 | Silencer-separator device A silencer-separator having a cylindrical casing of circular cross section which is divided into an upper separator chamber and a lower expansion chamber. An inlet pipe directs a gas stream into the expansion chamber, and a pair of angularly disposed tube... | 07/31/1979 |
| 4127183 | Silencer device A silencer device for attenuating fluid borne noise has a flow through housing with an open upstream end for the entrance of a fluid into the housing and a coaxial open downstream end for exhausting the fluid from the housing. An entrance header formed of... | 11/28/1978 |
| 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 |
| 4108276 | Vent silencer A vent silencer including an outer housing having an inlet and an outlet, and a divider plate is disposed within the housing and divides the housing into an upstream inlet chamber and a downstream chamber. Located within the inlet chamber and communicatin... | 08/22/1978 |
| 4093040 | Silencer and cooler for pump unit A silencing and cooling system for engine exhausts. The system utilizes a silencer body having an axial passage containing barriers, deflectors, and guide vanes. Cooling air enters via an axial inlet at one end and mixes with exhaust gases entering the ax... | 06/06/1978 |
| 3977493 | Exhaust control method and apparatus An exhaust control method and apparatus for controlling the exhaust flow of an internal combustion engine to increase engine efficiency and power while suppressing the sound of the exhaust by both absorbing and canceling sound waves.... | 08/31/1976 |
