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Reminder apparatus

  • US 5,025,426 A
  • Filed: 06/29/1990
  • Issued: 06/18/1991
  • Est. Priority Date: 11/18/1987
  • Status: Expired due to Fees
First Claim
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1. Reminder apparatus to be carried by a user with a key to remind the user as to the last operation in which the key was used with respect to a lock, comprising:

  • a real time clock for measuring time;

    an operation sensor for sensing the time of the last key operation in which the key was used with respect to the lock;

    a memory for storing the time of the last key operation as sensed by the sensor;

    a display;

    a manually-operable member; and

    a control circuit effective, upon manual operation of said latter member, to display in said display the time of the last key operation as stored in said memory.

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