Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 4325459 | Muffler diffuser An improved muffler diffuser adapted to be used with a muffler having a diffuser element mountable within the muffler adjacent the inlet end, with the diffuser element having a body portion mountable with the muffler and a diffuser portion disposed within... | 04/20/1982 |
| 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 |
| 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 |
| 4239091 | Muffler A muffler having a tubular cylindrical fiber-reinforced resin body with tapered extremities ending in short necks, through said body being disposed an axial aluminum tube with extremities projecting outwardly from the assembly, said tube being perforated ... | 12/16/1980 |
| 4211305 | Sound absorbing device Acoustic energy is absorbed from a moving fluid by passing the fluid, which is typically a gas, over a surface covered with a multiplicity of fibers or filaments, each filament having one end attached directly or indirectly to the surface and its other en... | 07/08/1980 |
| 4211303 | Sound absorbing device Acoustic energy is absorbed from a moving fluid by passing the fluid, which is typically a gas, through a liner comprising a closely woven textile-like material which serves as an acoustically transmitting inner lining. Anchored either directly or indirec... | 07/08/1980 |
| 4211302 | Sound absorbing device Acoustic energy is absorbed from a moving fluid by passing the fluid, which is typically a gas, through a tube of closely-woven material defining a gas passage, the tube of material being in contact with a surface covered with a multiplicity of fibers or ... | 07/08/1980 |
| 4211304 | Sound absorbing device Acoustic energy is absorbed from a moving fluid by passing the fluid, which is typically a gas, over a surface covered with a multiplicity of loops of fibers or filaments, each loop having one portion thereof fixed to a suitable backing material, the back... | 07/08/1980 |
| 4109750 | Zeno duct sound attenuating means A broadband sound attenuating, acoustically lined, duct of varying cross-sectional shape but in the usual case having a constant cross-sectional area, and wherein the duct liner is configured to maintain an essentially constant acoustic resistance and sca... | 08/29/1978 |
| 3955643 | Free flow sound attenuating device and method of making An improved sound attenuating device characterized by several novel structures which include (1) a foraminous conduit covered by (2) a layer of sound absorbing material of increasing static flow resistance from the inlet end to the outlet end, and (3) a h... | 05/11/1976 |
