×

Method of measuring coercive force of a magnetic card

  • US 6,637,653 B1
  • Filed: 05/04/2001
  • Issued: 10/28/2003
  • Est. Priority Date: 11/19/1998
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for judging coercive force of a magnetic card for reproducing or recording magnetic information formed on a low coercive force card or a high coercive force card inserted from a card slot by a magnetic head, wherein after rewriting data of said inserted card by an electric current capable of rewriting data of only said low coercive force card, said data of said card is reproduced, and said inserted card is judged as said low coercive force card if said data has been destroyed.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×