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Button illumination for repertory dialer with low battery voltage indication

  • US 4,339,632 A
  • Filed: 11/26/1980
  • Issued: 07/13/1982
  • Est. Priority Date: 11/26/1980
  • Status: Expired due to Term
First Claim
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1. In a telephone set having a plurality of buttons, each button representing a plurality of digits precorded in a memory within the telephone set, a display circuit means comprising light-emitting elements, each element being associated wih one of selected buttons within the plurality of buttons for identification of buttons representing a preferred plurality of digits recorded in memory, and each one of the selected buttons having associated therewith a light-emitting element of a distinctive color, the display circuit means further including both battery supply means for powering the display circuit means, and circuit-connecting means responsive to the operation of a switch for applying power from the battery supply means to the display circuit means, and the light-emitting elements being arranged to provide a low battery indication when the potential of the battery supply means goes below a predetermined level.

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