Patents Assigned to Corning SAS
  • Naphthopyrans with a heterocycle in the 5, 6-position, preparation, and (co)polymer compositions and matrices containing them
    Patent number: 6719925
    Abstract: The present invention relates to novel compounds of the naphthopyran type with a fused heterocycle in the 5,6-position. These compounds have formula (I) or (II) given below: These compounds (I) or (II) have valuable photochromic properties. The invention further relates to their preparation, to their applications as photochromic substances, and to the (co)polymer compositions and matrices containing them.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: April 13, 2004
    Assignee: Corning SAS
    Inventors: Olivier Breyne, You-Ping Chan, Patrick Jean