Emergency vehicle detector
US5559508A · kind A · utility
34Cited by
12References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1994 |
| Grant date | Sep 24, 1996 |
| Priority date | — |
| Expiry date | Aug 10, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/0965
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An emergency vehicle contains a transmitter for generating and transmitting a pair of fixed continuous wave signals which are distinguishable from each other in a preselected frequency band. A passenger vehicle contains a receiver which detects and distinguishes the pair of signals and generates an alert if the signals are determined to be at predetermined frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.