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Method of tagging with color-coded microparticles

  • US 4,053,433 A
  • Filed: 02/19/1975
  • Issued: 10/11/1977
  • Est. Priority Date: 02/19/1975
  • Status: Expired due to Term
First Claim
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1. In a method of tagging individual units of production of a substance with microparticles for the purpose of retrospective identification including the steps of:

  • (1) providing an inventory of batches of microparticles, each batch being uniquely coded, (2) maintaining a record of the unique code employed in each batch and (3) incorporating microparticles from any one batch with only one unit of production of a substance, the improvement comprising the use of microparticles which comprise compilations of, and are encoded according to, a particular orderly sequence of visually color distinguishable dyed and/or pigmented layers of organic materials, each said microparticle being 1 to 1000 micrometers at its broadest dimension across the color sequence, which inventory includes up to (C)(C-1)n-1 uniquely coded batches of microparticles where C is the number of available colors and n is the number of layers in the sequence.

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