Monitoring system based on etching of metals

  • US 8,343,437 B2
  • Filed: 06/04/2009
  • Issued: 01/01/2013
  • Est. Priority Date: 06/04/2008
  • Status: Expired due to Fees
First Claim
Patent Images

1. An indicating system comprising:

  • a zero-valent opaque metal or metal alloy indicator layer; and

    an activator layer comprising an activator or a precursor of said activator wherein said activator or said precursor of said activator renders said indicator layer transparent upon reaction.

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