Photochromic indeno-fused aphthopyrans

Photochromic indeno-fused aphthopyrans

  • CN 101,341,141 B
  • Filed: 12/05/2006
  • Issued: 09/28/2016
  • Est. Priority Date: 12/21/2005
  • Status: Active Grant
First Claim
Patent Images

1. photochromic material, including:

  • Indeno-fused aphthopyrans, it comprises the group B being connected with its 3-position and the group B '"'"' being connected with its 3-position, wherein indenesAnd the aphthopyrans condensed has formula (I)

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