Patent · US Expired

3-Substituted- 7-dialkylamino-spiro(2H-1-benzopyran-2,3'-(3H)-naphtha(2,1-b)pyrans)

US4384094A · kind A · utility

0Cited by
10References
2Claims
0Family size

Assignee

Inventors

Key dates

Filing dateOct 22, 1981
Grant dateMay 17, 1983
Priority date—
Expiry dateOct 22, 2001

Classification

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

Abstract

Substituted spiro 2H-1-benzopyran-2,3'-(3H)-naphtho(2,1-b)pyrans particularly suitable for use as precursors to stable colored pyrylium salts are disclosed.

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