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High contrast surface marking using metal oxides

DC
  • US 6,313,436 B1
  • Filed: 01/05/2000
  • Issued: 11/06/2001
  • Est. Priority Date: 09/08/1997
  • Status: Expired due to Term
First Claim
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1. A thermally activated, chemically based marking method comprising the steps of:

  • applying a layer of mixed metal oxide material containing an energy absorbing enhancer to a metal substrate; and

    irradiating said layer with a radiant energy beam having a wavelength selected to excite the energy absorbing enhancer in accordance with the form of a marking to be applied, thereby forming a marking layer atop the substrate.

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