Telephone care system with telephone line-checking

Details Telephone care system with telephone line-checking Telephone care system with telephone line-checking

1983-11-21

1987-08-11

George, Keith E.

Telephonic communications

Emergency or alarm communications

Personal monitoring

379 27, 379 40, H04M 1104

Patent

active

046866973

ABSTRACT:
A telephone care system has a line-checking arrangement connected to the line-seizing arrangement and an off-hook detector so as to activate the line-seizing arrangement and send a bad-line signal in the event that the off-hook detector does not provide an off-hook signal when the line has been seized. A preferred embodiment also uses a pilot light as a combined power-on and telephone line status indicator by causing the pilot light to blink in the presence of a bad-line signal. A preferred embodiment also utilizes the off-hook detector for the additional purpose of resetting an inactivity timer, which, on expiration of a predetermined interval of time, triggers an alarm call over the telephone wires.

REFERENCES:
patent: 3700813 (1972-10-01), Colman
patent: 3899645 (1975-08-01), Brafman
patent: 3987246 (1976-10-01), Willis
patent: 4051327 (1977-09-01), Rigsby
patent: 4273961 (1981-01-01), Blank et al.
patent: 4284849 (1981-08-01), Anderson et al.
patent: 4303801 (1981-12-01), Anderson et al.
patent: 4390750 (1983-01-01), Bartelink
patent: 4510350 (1985-04-01), Wagner et al.

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