Safety device and method of establishing group communication

Details Safety device and method of establishing group communication Safety device and method of establishing group communication

1987-05-04

1989-05-23

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340573, 455 73, 455 78, 455 79, 455 88, 455 95, 455229, G08B 108, H04Q 700

Patent

active

048334529

ABSTRACT:
An electronic two way signalling apparatus for permitting two or more persons not in line-of-sight with each other to activate transceivers for broadcasting and receiving radio frequency signals alerting those persons of the presence of others within the range of the broadcast signals. The apparatus carried by such persons provides a fixed outgoing radio frequency signal on a random broadcast time of short duration and reception of incoming radio frequency signals at time when a broadcast is silent, and each such apparatus is identical in operation.

REFERENCES:
patent: 3532986 (1970-10-01), Gelushia et al.
patent: 4020421 (1977-04-01), Elder et al.
patent: 4216432 (1980-08-01), Imazeki et al.
patent: 4501017 (1985-02-01), Higgins et al.
patent: 4673921 (1987-06-01), Saito et al.

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