Electricity: circuit makers and breakers – Multiple circuit control – Pivoted contact
Patent
1980-11-26
1982-07-13
Brigance, Gerald L.
Electricity: circuit makers and breakers
Multiple circuit control
Pivoted contact
179 90AN, 179 81C, 179 84L, 179 2BC, 200310, 200314, 340636, 340365R, H04M 1274, H04M 102
Patent
active
043396321
ABSTRACT:
A display illuminating circuit for a repertory dialer telephone set allows for a subscriber to operate a desired repertory button in low ambient light emergency situations. The circuit illuminates the desired buttons by distinguishable colors of light-emitting elements. Activation of the illumination circuit occurs in response to the telephone set going off-hook and then only for a limited period to conserve battery life. A battery voltage monitoring arrangement provides an indication when a local battery needs to be replaced. In response to an activation signal provided by the voltage monitoring arrangement, the light-emitting elements flash at a level that is detectable by the subscriber going off-hook even in normal ambient light conditions.
REFERENCES:
patent: 2437555 (1948-03-01), Rees
patent: 3132211 (1964-05-01), Bauman
patent: 3670111 (1972-06-01), Burosky et al.
patent: 3784760 (1974-01-01), Rickert
patent: 4019112 (1977-04-01), Satoh
patent: 4027231 (1977-05-01), Lohrmann
patent: 4056701 (1977-11-01), Weber
Early Scott H.
Savidge David M.
Bell Telephone Laboratories Incorporated
Brigance Gerald L.
Williamson S. R.
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