Patent · US Expired

Silver complex diffusion transfer process using two toning agents

US4436805A · kind A · utility

9Cited by
6References
8Claims
0Family size

Assignee

Inventors

Key dates

Filing dateSep 27, 1982
Grant dateMar 13, 1984
Priority date—
Expiry dateSep 27, 2002

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10S430/166
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

Disclosed are a developer for silver complex diffusion transfer process which contains a nitrogen-containing heterocyclic compound having a mercapto or thione group and, as substituent, an alkyl group of 4 or more carbon atoms, an aryl group, or a group having both the alkyl and aryl groups and further contains an alkali-soluble iodide in an amount such that the molar ratio of the iodide in terms of iodine to the heterocyclic compound is in the range of from 1:5 to 5:1 and a silver complex diffusion transfer process using said developer, according to which transferred silver images of improved color tone, maximum density, contrast and sharpness can be obtained.

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