Emergency vehicle detector

Details Emergency vehicle detector Emergency vehicle detector

1994-08-10

1996-09-24

Johnson, Stephen M.

Communications: electrical

External condition vehicle-mounted indicator or alarm

Transmitter in another vehicle

34082573, G08G 10965

Patent

active

055595081

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.

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patent: 3997868 (1976-12-01), Ribnick et al.
patent: 4238778 (1980-12-01), Ohsumi
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patent: 4587522 (1986-05-01), Warren
patent: 4724312 (1988-02-01), Snaper
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patent: 4794394 (1988-12-01), Halstead
patent: 5278553 (1994-01-01), Cornett et al.
Application (U.S.) Ser. No. 08/297,969.
Noah Webster, Webster's New International Dictionary, Jun. 22, 1950, p. 2051.

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