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Electronic access card having key pads and coils and combination using the same

  • US 4,864,115 A
  • Filed: 08/22/1986
  • Issued: 09/05/1989
  • Est. Priority Date: 08/22/1986
  • Status: Expired due to Term
First Claim
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1. In an electronic access card having a unique identification number for use by a user having a personal identification number in conjunction with a lock device, a printed circuit board a microprocessor carried by the printed circuit board, a plurality of keys carried by the board, and connected to the microprocessor, a clock coupled to the microprocessor, a battery carried by the printed circuit board and coupled to the microprocessor and means coupled to the microprocessor and to the battery whereby when keys are operated the keys are polled by the microprocessor and information is adapted to be supplied by the microprocessor to the lock device, said means coupled to the microprocessor permitting information to be coupled from the lock device to the card, said microprocessor having means capable of receiving, storing and transmitting encrypted information which includes the unique identification number for the card, the personal identification number of the user of the card and an update code, means controlled by the microprocessor and the clock for invalidating the update code after a predetermined interval of time, said microprocessor also including means for receiving a periodic update for the update code from information inputted through the keys by the user to permit the continued use of the card by the user after insertion of the periodic update for the update code.

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