Patent · US Expired

Lactones of the benzazaxanthene series and dye-forming components for duplication processes

US3997541A · kind A · utility

1Cited by

1References

5Claims

0Family size

Assignee

BASF SE

Inventors

Ernst Schefczik
Hellmut Kast

Key dates

Filing date	Jul 26, 1974
Grant date	Dec 14, 1976
Priority date	—
Expiry date	Jul 26, 1994

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09B11/26
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

New lactones of the benzazaxanthene series, their production from benzoylbenzoic acids and homophthalimides and their use as dye-forming components in the red range for pressure-sensitive recording materials.

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