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"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
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| Number | Title | Issue Date |
| 7072747 | Strategies for locomotive operation in tunnel conditions A method of controlling operation of a train (T) for passage of the train through a tunnel. The train has a plurality of locomotives (L1-Ln) pulling the train. The position of the lead locomotive relative to the tunnel entrance is determined, as is the amount... | 07/04/2006 |
| 6724917 | Control apparatus for ventilating a tunnel A control apparatus for a ventilator that ventilates a tunnel in response to visibility of the inside of the tunnel, including at least one picture image input device configured to take a picture of the inside of the tunnel, a visibility index determination device c... | 04/20/2004 |
| 6557374 | Tunnel fire suppression system and methods for selective delivery of breathable fire suppressant directly to fire site A total flood fire suppression system is provided for transportation tunnels and other human-occupied environments, which employs a selective gas delivery method for supplying a breathable fire-extinguishing agent to a location closest to a fire site. The... | 05/06/2003 |
| 6139422 | Exhaust gas extraction apparatus for a vehicle shed An exhaust gas extraction apparatus for a vehicle shed includes a running rail arranged in the exit direction of a vehicle in an upper shed region, with a carriage which can travel thereon and an extraction hose hanging down therefrom, with an extraction ... | 10/31/2000 |
| 5069115 | Exhaust-gas removal duct formed from individual axially mutually adjacent sections for track-forming lanes The invention relates to an exhaust-gas removal duct formed from individual axially mutually adjacent sections for track-forming lanes, having a longitudinal slot closed by a pair of elastic sealing lips. Each section has two channel-shaped shells which a... | 12/03/1991 |
| 4898088 | Totally fusible tunnel ventilation damper system A totally fusible tunnel ventilation damper system which comprises an enlarged ventilation opening partially covered by a sheet of fusible material. The sheet of fusible material is supported by a series of bars traversing the ventilation opening and is s... | 02/06/1990 |
| 4744305 | Exhaust removal system A diesel exhaust hood system is disclosed in which a narrow smoke entry slot and large capacity allow bursts of exhaust gases from locomotive engines to be contained inside the hood. The likelihood of spillover from exhaust exceeding the fan capacity is r... | 05/17/1988 |
| 4567817 | Exhaust-gas offtake for a track-guided vehicle propelled by combustion-energy An exhaust-gas offtake for a track-guided vehicle propelled by combustion-energy, the exhaust gas being led into a force-ventilated waste gas duct located above the vehicle, which is anchored to the roof of a tunnel along the route followed. The exhaust p... | 02/04/1986 |
| 4539897 | Duct system for a track-guided vehicle An exhaust duct system for a track-guided vehicle powered by an internal combustion engine having a fixed section extending through the interior of the vehicle and a section projecting above the roof of the vehicle for channeling exhaust gases into a forc... | 09/10/1985 |
| 4037526 | Train tunnel ventilation method and apparatus A train tunnel is ventilated by closing an exit end of the tunnel as a train approaches the entrance end, so that during passage through the tunnel the train acts as a loose piston moving through a long closed cylinder, to cause a rapid airflow rearwardly... | 07/26/1977 |
