Power-up system for line-powered telephones

Details Power-up system for line-powered telephones Power-up system for line-powered telephones

1996-10-09

1999-08-24

Le, N.

Telephonic communications

Subscriber line or transmission line interface

379420, 379388, 455569, 455557, H04M 100

Patent

active

059434201

ABSTRACT:
A speaker-phone telephone, in which a speaker-microphone unit is powered by wall current, and a separate telephone is separately powered, by telephone line current. The speaker-microphone unit contains a switch by which a user can call for a speaker-phone call. The switch initiates a signal, which is held in existence, until a microprocessor detects the signal, and removes it.

REFERENCES:
patent: 3026383 (1962-03-01), Englander
patent: 3872262 (1975-03-01), Kerman
patent: 4025728 (1977-05-01), Jacobson
patent: 4101735 (1978-07-01), Bridenbaugh
patent: 4237344 (1980-12-01), Moore
patent: 4277647 (1981-07-01), Brolin et al.
patent: 5561712 (1996-10-01), Nishihara
patent: 5636273 (1997-06-01), Schopfer et al.

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