Dual ultrasonic train detector
US8109474B2 · kind B2 · utility
17Cited by
14References
6Claims
0Family size
Inventor
Key dates
| Filing date | Nov 27, 2009 |
| Grant date | Feb 7, 2012 |
| Priority date | — |
| Expiry date | Jun 8, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB61L25/023
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A train detector having dual ultrasonic sensors positioned adjacent to a rail for sensing the movement thereby of a train wheel and determining the direction and speed of the train for transmitting such information to nearby workers and signal devices and a method of train detecting are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.