Control circuitry for key telephone apparatus

Details Control circuitry for key telephone apparatus Control circuitry for key telephone apparatus

1976-10-01

1978-03-28

Claffy, Kathleen H.

179 81C, H04M 172

Patent

active

040816257

ABSTRACT:
The disclosure is for key telephone system line control circuitry which provides telephone station line status signals for central office ring, busy, idle and station hold conditions by means of a single control line.

REFERENCES:
patent: 3239610 (1966-03-01), Morse et al.
patent: 3453396 (1969-07-01), Lacey et al.
patent: 3739104 (1973-06-01), O'Neill
patent: 3748403 (1973-07-01), Schartmann et al.
patent: 3860763 (1975-01-01), Sudoh et al.
patent: 3902024 (1975-08-01), Hijikata et al.

Affiliated with

Also associated with

Rating

Control circuitry for key telephone apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Control circuitry for key telephone apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control circuitry for key telephone apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-644077