High contrast surface marking

  • US 6,075,223 A
  • Filed: 09/08/1997
  • Issued: 06/13/2000
  • Est. Priority Date: 09/08/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. A thermally activated, chemically based marking method comprising the steps of:

  • applying a layer of glass frit material containing an energy absorbing enhancer to a glass substrate;

    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 bonded and permanent marking layer atop the substrate which is visible in contrast with the substrate; and

    wherein the layer of glass frit material further comprises a thickness ranging between 5 and 500 microns.

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