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"I watched his countenance closely, to see if he was not deranged ... and I was assured by other senators after he left the room that they had no confidence in it."
U.S. Senator Smith of Indiana ; After seeing Samuel Morse demonstrate the telegraph.
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| Number | Title | Issue Date |
| 4757874 | Air intake noise suppressor for an internal combustion engine An air intake noise suppressor for reducing noise generated by intake air sucked into an internal combustion engine. An intake pipe is provided with a resonance pipe, which extends forwards within the intake pipe as penetrating through a rear end wall of ... | 07/19/1988 |
| 4744440 | Exhaust gas silencing device An exhaust silencing device comprises an outer tube that is pinched down to form a series of annular chambers around a coaxial inner gas flow tube and has openings connecting the chambers to provide for some secondary gas flow parallel to primary flow thr... | 05/17/1988 |
| 4736817 | Stamp formed muffler A muffler is provided with a pair of stamp formed internal plates and a pair of stamp formed external shells. The internal plates define inlet and outlet tubes at least portions of which are provided with arrays of perforations or louvers. One or more tun... | 04/12/1988 |
| 4700806 | Stamp formed muffler A muffler is provided with a pair of stamp formed internal plates and a pair of stamp formed external shells. The internal plates define inlet and outlet tubes at least portions of which are provided with arrays of perforations or louvers. One or more tun... | 10/20/1987 |
| 4645032 | Compact muffler apparatus and associated methods An axially asymmetric exhaust gas muffler has a perforated central exhaust duct that is circumscribed by a duality of reactive sound attenuating chambers in each of which is positioned a resonant sound attenuator.... | 02/24/1987 |
| 4501341 | Low frequency muffler A muffler comprises two Helmholtz resonators, one tuned for high frequency and the other for low frequency. There is a resonance of the high frequency resonator volume's compliance and the effective tail pipe gas inertance which produces an undesirable lo... | 02/26/1985 |
| 4418443 | Noise suppressor for vacuum sweepers and the like A noise suppressor for vacuum cleaners is characterized by a muffler formed of a succession of tubes of different cross sectional areas and lengths. The muffler defines a low pass acoustic filter, and is connected in line with an exhaust outlet from the v... | 12/06/1983 |
| 4415059 | Muffler An inner shell having aligned first and second expansion chambers is spacedly disposed in an outer shell in a manner to define therebetween four isolated chambers upstreamly positioned two of which surround the first expansion chamber and downstreamly pos... | 11/15/1983 |
| 4378859 | Silencer for intake/exhaust gas duct The disclosed silencer has noise-absorbing partitions disposed in a gas duct in parallel with but with a spacing from outer walls of the duct, so as to define gas passage means and noise-absorbing space means in the duct. The noise-absorbing space means i... | 04/05/1983 |
| 4361423 | Combination acoustical muffler and exhaust converter A combination acoustical muffler and exhaust converter for use with internal combustion engines, comprising an elongated hollow cylinder adapted to be connected to a source of exhaust gas, screen means positioned at a plurality of longitudinally spaced lo... | 11/30/1982 |
| 4360075 | Low back pressure exhaust silencer for diesel locomotives An exhaust silencer especially for turbo-charged diesel locomotives with a single exhaust outlet combines a straight through exhaust duct preferably diverging to recover velocity pressure and minimize back pressure with dual silencing means including a la... | 11/23/1982 |
| 4356886 | External housing for an exhaust muffler for internal combustion engines An external housing for an exhaust muffler comprising at least one pipe section having one seamlessly converging end and at least one connecting piece seamlessly extending from the converging end, produced as a one-piece extrusion molded body of a malleab... | 11/02/1982 |
| 4350223 | Silencer A silencer consisting of a porous metal tube disposed in a housing and a resonance chamber formed between the exterior of the tube and the interior of the housing. The housing is made of a flexible non-metallic material which is highly resistant to excite... | 09/21/1982 |
| 4281740 | Muffler A muffler (50,50') for use in conjunction with a plurality of aspirators during the production of multifilament, synthetic yarn is provided. The exhaust tubes (32) of the aspirators are clustered for discharge by and through the muffler (50,50') which red... | 08/04/1981 |
| 4281741 | Compact exhaust silencer for diesel locomotives A compact exhaust silencer especially for use in diesel locomotives having a single exhaust outlet located in relatively close proximity to the roof of the engine hood. The silencer includes an offset duct having dual oppositely curved ninety degree bends... | 08/04/1981 |
| 4164266 | Exhaust gas muffler For dampening exhaust gas noise a muffler contains two portions, of which one is adapted to take care of high frequency noise and includes dampening material, and the other is adapted to take care of low frequency noise and is devoid of such material. The... | 08/14/1979 |
| 4153136 | Muffler A muffler incorporates a tubular shell that has an acoustically reflective interior circumferential surface. In successive sections taken transversely through the shell, the acoustically reflective surface has at least a portion of its circumference shape... | 05/08/1979 |
| 4109752 | Muffler A muffler incorporates a tubular shell that has an acoustically reflective interior circumferential surface. In successive sections taken transversely through the shell, the acoustically reflective surface has at least a portion of its circumference shape... | 08/29/1978 |
| 4046219 | Exhaust silencer apparatus for internal combustion engine A tuned pipe exhaust for a two cycle internal combustion engine for snowmobiles and the like includes a conically shaped converging megaphone section terminating in a small end tube. An absorptive spiral muffler unit is co-axially secured to the end tube ... | 09/06/1977 |
