Did You Know...
...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 6345233 | Collision avoidance using GPS device and train proximity detector A processor (12) located on a vehicle processes GPS coordinates input thereto to provide an area of protection around the vehicle. Railroad grade crossing data (82, 84) stored in a data base (30) is read therefrom to ascertain whether a grade crossing is ... | 02/05/2002 |
| 6025789 | Train proximity detector Disclosed is a train proximity detector for detecting an RF carrier transmitted by a train, for a predefined period of time. Further, the encoded FSK data is decoded to determine if a match with a predefined data signature exists. If a match exists, visua... | 02/15/2000 |
| 5739768 | Train proximity detector Disclosed is a train proximity detector for detecting an RF carrier transmitted by a train, for a predefined period of time. Further, the encoded FSK data is decoded to determine if a match with a predefined data signature exists. If a match exists, visua... | 04/14/1998 |
