×

System for retrospective identification and method of marking articles for retrospective identification

  • US 6,309,690 B1
  • Filed: 04/01/1999
  • Issued: 10/30/2001
  • Est. Priority Date: 04/01/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. Method of marking an article for retrospective authentication, comprising the steps of simultaneously:

  • a) forming a unique mark including a set of microparticles, each said microparticle having two or more distinguishable layers with the sequence of the layers having an assigned meaning; and

    b) applying the unique mark to an article to be authenticated, said mark being unique as a result of the pattern formed by the spatial relationship of said microparticles and said pattern being determined upon placement of said mark on the article.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×