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Multi-detectable ink compositions and method of use

  • US 3,928,226 A
  • Filed: 01/16/1974
  • Issued: 12/23/1975
  • Est. Priority Date: 01/16/1974
  • Status: Expired due to Term
First Claim
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1. A MACHINE-READABLE MARKING INK COMPOSITION HAVING TWO OR MORE MIXIED PIGMENTS FOR PROCESSING AND DISTINGUISHING ARTICLES BOTH BISUALLY AND UNDER RADIATION OF A DISCRETE PREDETERMINED WAVELENGTH, COMPRISING A. FROM 0.5 TO 10 PERCENT NON-FLUORESECENT PIGMENT BY WEIGHT;

  • B. FROM 2.0 TO 25.0 PERCENT FLUORESCENT PIGMENT BY WEIGHT WHICH FLUORESCES UNDER RADIATION AT A PREDETERMINED WAVELENGTH,

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