Patent · US Expired

Pyrazolidinone salts as developing agents

US4687846A · kind A · utility

1Cited by
1References
5Claims
0Family size

Assignee

Inventors

Key dates

Filing dateFeb 28, 1986
Grant dateAug 18, 1987
Priority date—
Expiry dateFeb 28, 2006

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG03C5/26
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

Salts of 1-phenyl-3-pyrazolidinones which are useful photographic silver halide developing agents.

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