Patent ID: 6214250
Filing Date: 2001-04-10
Classification: C03C,G09F,Y10T

Abstract:
A method for making a composite refractory barcode article, said method comprising the steps of:(a) providing a ceramic composite suitable for labeling a substrate, comprising:(A) a fired ceramic body comprising a base layer, said base layer including:(i) a first glassy phase;(ii) a first refractory phase intersdispersed with said first glassy phase,said first glassy phase being capable of wetting a substrate at an application temperature; and(B) a top layer provided on said fired ceramic body, said top layer comprising a second glassy phase and a second refractory phase interpersed within said second glassy phase, and(b) ablating by laser a portion of said top layer of said ceramic composite to provide a bar code,wherein there is sufficient color contrast between said top layer and said fired ceramic body such that said bar code pattern is optically discernible.