Patent · US Active

3H-naphtho [2,1-B] pyrans as photochromic dichroic dyes and optical article containing them

US9249136B2 · kind B2 · utility

0Cited by
5References
20Claims
0Family size

Assignees

Inventors

Key dates

Filing dateSep 6, 2006
Grant dateFeb 2, 2016
Priority date—
Expiry dateFeb 9, 2027

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC07D455/04
  • WIPO fieldOrganic fine chemistry
  • WIPO sectorChemistry

Abstract

A naphthopyran compound represented by the formula (I):wherein:

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.