Emergency warning device for use in a party line telephone syste

Details Emergency warning device for use in a party line telephone syste Emergency warning device for use in a party line telephone syste

1984-12-13

1987-04-07

George, Keith E.

Telephonic communications

Emergency or alarm communications

Responsive to sensed nonsystem condition

379 43, 379 48, H04M 1104

Patent

active

046566520

ABSTRACT:
An emergency warning device comprises an alarm signal circuitry incorporated in the telephone lines of various telephone systems such as an existing party-line telephone system, or interphone system and it is adapted to issue an alarm call in case of emergency. The control circuitry provides a warning message of a state of emergency affairs that can be given to a user by a party-line telephone or the like in case of emergency.

REFERENCES:
patent: 2504641 (1950-04-01), Burgener
patent: 3428750 (1969-02-01), Hoffman
patent: 3767857 (1973-10-01), Colas et al.
patent: 3777065 (1973-12-01), Galian et al.
patent: 3801971 (1974-04-01), Stendig et al.
patent: 3865985 (1975-02-01), Stankus
patent: 4041242 (1977-08-01), Churchill

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