Patent ID: 6354506
Filing Date: 2002-03-12
Classification: G06K

Abstract:
A method for impeding the falsification of an instrument comprising the steps of:propagating the instrument along a motor driven carriage, where the motor is operated at a predetermined rate; locating a first optical mark formed on said instrument; selectively defining the location of an initial second mark on said instrument at a distance â€œdâ€  from said first mark; selectively defining the location of a â€œnewâ€  second mark at a different location than that of the initial second mark during the period of time that the instrument is propagated along the motor driven carriage; measuring the distance â€œdâ€  between the first and second marks as a function of the rate of movement of the motor; and encoding the information relative to the distance â€œdâ€  in an information storage medium located on said instrument each time the instrument is propagated along the carriage.