Patent ID: 8748079

Claim:
A method of forming multiple microparticle codes, the method comprising: providing a pattern, wherein the pattern defines a code element; providing a substrate, wherein the substrate comprises a first microparticle region and a second microparticle region; printing a first microparticle code in the first microparticle region, wherein printing the first microparticle code comprises: printing the pattern on the substrate to form an initial first-code element within the first microparticle region; printing the pattern on the substrate to form at least one successive first-code element, such that the initial first-code element and the at least one successive first-code element are within the first microparticle region; printing a second microparticle code in the second microparticle region, wherein printing the second microparticle code comprises: printing the pattern on the substrate to form an initial second-code element within the second microparticle region; printing the pattern on the substrate to form at least one successive second-code element, such that the initial second-code element and the at least one successive second-code element are within the second microparticle region.