I-Use indication in a telephone keyset

Details I-Use indication in a telephone keyset I-Use indication in a telephone keyset

1981-04-30

1983-02-15

Schreyer, Stafford D.

179 99R, 179 81C, 179 27FC, H04M 122

Patent

active

043743080

ABSTRACT:
A telephone keyset is disclosed which has a dialpad of dialing keys, a series of line keys, at least one function key and a telephone receiver hook switch. Each of the line keys is provided with a lamp, such as an LED, for indicating when the telephone line associated with that line key is in use. The keyset apparatus also includes a programmed device, responsive either to the operation of the function key or the hook switch, for turning off all the indicator lamps with the exception of that lamp associated with that telephone line which the keyset apparatus is currently using.

REFERENCES:
patent: 4046972 (1977-09-01), Huizinga et al.
patent: 4203011 (1980-05-01), Coviello

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