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Method of making ceramic member and marked ceramic member

  • US 6,413,619 B1
  • Filed: 07/28/2000
  • Issued: 07/02/2002
  • Est. Priority Date: 07/29/1999
  • Status: Active Grant
First Claim
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1. A ceramic member having a marking portion, whose color tone is different from that of a portion other than the marking portion, on the surface, comprising ceramics containing a color changing agent, wherein the valence of the color changing agent in the marking portion is different from the valence of the color changing agent in the portion other than the marking portion and wherein the color changing agent is an oxide of at least one metal selected from the group consisting of Mn, Fe, V, Se and Cu, a composite oxide of at least one metal selected from the group consisting of Mn, Fe, V, Se and Cu, and mixtures thereof.

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