Telephone system providing a talking operation after main power

Details Telephone system providing a talking operation after main power Telephone system providing a talking operation after main power

1997-03-06

1999-09-28

Bost, Dwayne D.

Telecommunications

Radiotelephone system

Including private cordless extension system

455572, 455569, H04Q 720

Patent

active

059603585

ABSTRACT:
When an SP key is operated when power from a commercial utility is disconnected, an energized state forming circuit forms an energized state from a subscriber's line and power is supplied from the subscriber's power supply section through the energized state forming circuit to a microcomputer. The microcomputer thus is operated from the subscriber's line even after power failure occurs.

REFERENCES:
patent: 4509201 (1985-04-01), Sekigawa et al.
patent: 4995072 (1991-02-01), Pedigo
patent: 5400388 (1995-03-01), Heo
patent: 5423077 (1995-06-01), Ueda
patent: 5553138 (1996-09-01), Heald et al.
patent: 5572575 (1996-11-01), Yamamoto et al.

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