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US 3,940,531 AGranted
Stain decorated glass-ceramic article
AssigneePPG Industries, Inc.
InventorHenry M. Demarest, Jr.
Life of this patent
Estimating the term…
Abstract
A method for producing decorated glass-ceramic articles is disclosed. The method involves contacting a surface of a crystallizable glass with molten tin and thereafter applying to the tin-contacting surface a stain decorating composition. The article is then fired at a temperature such that the glass simultaneously crystallizes and the stain diffuses into the article to form the decoration.
Claims1
A stain-decorated glass-ceramic article comprising:
- a solid body of fine-grain crystals dispersed in a glassy matrix, the crystals forming the major portion thereof, and including silica, alumina, lithia, and a crystal-nucleating agent, but substantially free of arsenic and antimony oxides;
- a tin-penetrated zone extending into said body at least 5 microns from at least one surface of said body and in which the tin ion concentration is greater than that in interior portions of said body;
- a colorant-penetrated zone extending into said body from 1 to 40 mils from portions of said at least one surface of said body and in which the concentration of colorant, selected from the group consisting of platinum, palladium, silver, and gold, is greater than in interior portions of said body.
Dependencies are inferred from the claim text.