Patent · US Expired

3-Substituted-7-alkoxy-2,2'-Spirobi[2H-1-benzopyrans]

US4348508A · kind A · utility

2Cited by
9References
5Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJun 25, 1981
Grant dateSep 7, 1982
Priority date—
Expiry dateJun 25, 2001

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC08F24/00
  • WIPO fieldOrganic fine chemistry
  • WIPO sectorChemistry

Abstract

Substituted Spirobi[2H-1-benzopyrans] particularly suitable for use as precursors to stable colored pyrylium salts are disclosed.

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