System using the telephone network to control locks at a number

Details System using the telephone network to control locks at a number System using the telephone network to control locks at a number

1982-06-30

1984-03-13

Rubinson, G. Z.

H04M 1100

Patent

active

044369581

ABSTRACT:
A number of remotely located locked devices (26 and 27) are selectively operated by sending signals from a central supervisory location (28) through the telephone network (27) to a telephone set 32 and a converter (44) installed at each remote location. Initiating call signals from a remote telephone set are automatically generated and routed through the telephone network to a supervisory telephone set equipped with a standard 0-9 digit dial plus a special pushbutton (34) for generating a special signal. Receipt of the special signal at a calling remote station disconnects the remote telephone set and conditions a stepping circuit (74-86) and a sequence circuit (81-82) for subsequent operation upon receipt (88-104) of a predetermined sequence of 0-9 digit signals. Upon receipt of the predetermined sequence of signals within a first set time period, the stepping circuits and the sequence circuits are operated to generate (111) a signal that releases the locked device for a second set time period.

REFERENCES:
patent: 3484561 (1969-12-01), Matthews
patent: 3557318 (1971-01-01), Buonsante et al.
patent: 3917911 (1975-11-01), Lesher
patent: 3947641 (1976-03-01), Trell
patent: 4113986 (1978-09-01), Clement et al.

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