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Radiotelephone credit card data communications

  • US 4,831,647 A
  • Filed: 06/02/1987
  • Issued: 05/16/1989
  • Est. Priority Date: 06/02/1987
  • Status: Expired due to Fees
First Claim
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1. A method for communicating credit card information from a mobile radiotelephone unit to a radiotelephone system in which a radiotelephone call from the mobile unit will be authorized if the costs of the radiotelephone call may be charged against a valid credit card, comprising the steps of:

  • reading a credit card identification number and creating a data field therefrom at the mobile unit;

    generating a message having a format comprising;

    (a) an opening flag of at least one start-of-header (SOH) character,(b) a data length character,(c) a message type character,(d) said created data field,(e) at least one cyclic redundancy code character, and(f) at least one longitudinal redundancy check character; and

    transmitting said generated message from a transmitter of the mobile unit.

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