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ELECTROCHROMIC DEVICES

  • US 3,879,108 A
  • Filed: 05/18/1973
  • Issued: 04/22/1975
  • Est. Priority Date: 12/23/1971
  • Status: Expired due to Term
First Claim
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1. A variable light transmission device which comprises a persistent electrochromic material as a light modulating material, and a pair of electrodes for providing electric current to said material, wherein a persistent electrochromic material is used, as the counterelectrode.

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