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Electrically powered portable medium

  • US 5,072,103 A
  • Filed: 03/14/1990
  • Issued: 12/10/1991
  • Est. Priority Date: 11/12/1987
  • Status: Expired due to Fees
First Claim
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1. An electrically powered portable medium, comprising:

  • a battery in the medium for supplying electric power to the medium;

    detecting means, responsive to electric power received from the battery only once for a prescribed limited time after said medium is activated and before said medium is used, for comparing a voltage of the battery with a predetermined threshold level; and

    a central processing unit for controlling said detecting means and for processing data, at least a portion of said data being provided to said medium by an external device.

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