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Optical temperature indicator

  • US 5,686,153 A
  • Filed: 01/15/1997
  • Issued: 11/11/1997
  • Est. Priority Date: 03/24/1994
  • Status: Expired due to Fees
First Claim
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1. An optical temperature indicator comprising an optically active layer of a transparent polymeric material and a liquid crystalline material, said transparent polymeric material being poorly miscible with said liquid crystalline material and said liquid crystalline material being dispersed in said transparent polymeric material, characterized in that the molecules of the liquid crystalline material form part of a polymeric structure separate from said polymeric material via covalent bonds.

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