Monitoring System Based on Etching of Metals

  • US 20090301382A1
  • Filed: 06/04/2009
  • Published: 12/10/2009
  • Est. Priority Date: 06/04/2008
  • Status: Active Grant
First Claim
Patent Images

1. An indicating system comprising a metallic indicator layer and a layer of an activator or its precursor.

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