Did You Know...
...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 6340139 | Highway grade crossing vehicle violation detector In one embodiment, the present invention is an alarm monitor for a railroad grade crossing, the grade crossing having an island activation relay that is activated in response to an approaching train, the alarm monitor including a micropower impulse radar ... | 01/22/2002 |
| 6267332 | Railroad safety system A railroad safety system for use at an intersection of a roadway and a railroad track, that comprises a sensor for detecting a hazardous situation and a voice alarm for giving a voice command to warm drivers and pedestrians of the hazardous situation.... | 07/31/2001 |
| 6241197 | Automated rail way crossing A device for monitoring the passage of a train traveling through a rail way crossing, said device including a first and second sensors for sensing the presence of the train on a rail track when the train is in proximity to the sensors, said first and seco... | 06/05/2001 |
| 6158696 | Railroad accident prevention system with ground-retractable vehicle barrier An apparatus that prevents motorists from crossing railroad tracks, when the warning gates are down during approaching of a train consists, of a plurality of tire-piercing cogs which are retracted from the ground when the railroad crossing gate is closed.... | 12/12/2000 |
