Patent · US Expired

Phenyljulolidinylphthalides

US4032527A · kind A · utility

4Cited by
0References
6Claims
0Family size

Assignee

Inventors

Key dates

Filing dateNov 27, 1974
Grant dateJun 28, 1977
Priority date—
Expiry dateNov 27, 1994

Classification

  • Technology area (CPC B)Performing Operations; Transporting
  • CPC primaryB41M5/327
  • WIPO fieldBasic materials chemistry
  • WIPO sectorChemistry

Abstract

Substituted 3,3-diphenylphthalides, useful as color precursors, particularly in the art of pressure-sensitive duplicating systems, are prepared by condensing substituted 2-benzoylbenzoic acids with substituted anilines.

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