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Reminder device

  • US 4,558,307 A
  • Filed: 07/12/1983
  • Issued: 12/10/1985
  • Est. Priority Date: 09/08/1982
  • Status: Expired due to Fees
First Claim
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1. A reminder device adapted to be secured to an object comprisinga box formed with an aperture in which a photosensitive cell is secured, said cell being adapted to produce an electrical signal when irradiated by ambient radiation;

  • amplifier means having its input connected to the output of said photosensitive cell;

    electric transformer means having a primary winding connected to be fed by the output signal of said amplifier means and having a secondary winding;

    first delay means connected across the secondary winding of said transformer means;

    logic gate means connected to said first delay means to be switched by the output signal from the delay means to provide a control signal;

    output gate means having a first input connected to accept said control signal and a second input, said output gate means having its output connected to an audible signal generator;

    second delay means connected across the output of said logic gate means;

    switching means having its input connected to said second delay means and having its output connected to the second input of said output gate means, said switching means being responsive to the output signal from said second delay means to inhibit the control signal for said audible signal generator thereby interrupting the audible warning signal after a predetermined interval of time.

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