Quotables
"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 |
| 6527230 | Track receiver A track receiver is located on-board a locomotive for receiving a first magnetic field produced in response to a cab signal carrier transmitted through a rail on which the locomotive is carried. The track receiver is oriented so that a second magnetic fie... | 03/04/2003 |
| 6059237 | Interactive toy train A toy train system has movable and removable trigger devices to be located by a user wherever selected on the toy train track. The train locomotive includes the ability to activate a sound and a light signal which can correspond to the sound. The train lo... | 05/09/2000 |
| 5673876 | Automatic electric trainline safety interlock A method and apparatus for preventing energization or powering of an electric trainline until a test signal transmitted through the train is verified by the locomotive.... | 10/07/1997 |
| 5501416 | Method and apparatus for inductively receiving cab signaling on board a railway vehicle A cab signaling apparatus for use on board a railway vehicle which is propelled on rail tracks by an electric drive motor. The invention utilizes a cab signal transmitted to the vehicle through a track circuit in the rails. On board receiving of the cab s... | 03/26/1996 |
| 5501417 | Noise cancellation in railway cab signal A cab signaling apparatus for use on board a railway vehicle which is propelled on rail tracks by an electric drive motor. The invention utilizes a cab signal transmitted to the vehicle through a track circuit in the rails. On board receiving of the cab s... | 03/26/1996 |
