Device for visual display of telephone operation symbols

Details Device for visual display of telephone operation symbols Device for visual display of telephone operation symbols

1980-11-20

1982-10-05

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

179 81C, 179 84L, 340365VL, 340712, H04M 123

Patent

active

043529593

ABSTRACT:
In accordance with the invention there is provided a display device for visual display of telephone operation symbols in telecommunication apparatus which includes, for example, a key-dialing block. The device has a display element incorporated in a key-dialing block and an electronic circuit controlling the display element. The device is such as to provide a visual display showing a first symbol when one telephone set in a two set circuit is in use while displaying a second symbol when a number is dialed with the receiver replaced.

REFERENCES:
patent: 3943288 (1976-03-01), Reed et al.
patent: 4046972 (1977-09-01), Huizinga et al.
patent: 4078257 (1978-03-01), Bagley
patent: 4169217 (1979-09-01), Szanto et al.

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