Affymetrix of Santa Clara, Calif., has received US Patent No. 8,460,854, "Multiple step printing methods for microbarcodes." The patent claims a method for forming a microparticle, where a provided pattern defines a code element. The pattern is then printed on the substrate to form a first code element within a microparticle region, and printed again to create successive code elements, such that the first code element and the successive code elements are within the same microparticle region.

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