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Color changing matrix as wear indicator

  • US 5,906,834 A
  • Filed: 10/09/1996
  • Issued: 05/25/1999
  • Est. Priority Date: 06/15/1992
  • Status: Expired due to Term
First Claim
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1. A color-changing matrix comprising two joined layers, an outer layer comprising a water-soluble polymer, a water-insoluble polymer and a first colorant, and an inner layer comprising a water-insoluble polymer and a second colorant different from said first colorant.

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