Fogging Or Nucleating Agent Containing Patents (Class 430/598)
  • Process for the manufacture of photographic silver halide emulsions containing silver halide crystals of the twinned type
    Patent number: 4184878
    Abstract: A method of preparing photograhic silver iodide, containing emulsions is provided.
    Type: Grant
    Filed: November 30, 1978
    Date of Patent: January 22, 1980
    Assignee: Ciba-Geigy Aktiengesellschaft
    Inventor: Trevor J. Maternaghan
  • Offset printing plate
    Patent number: 4175965
    Abstract: An improved direct offset printing plate high in photographic speed which utilizes silver complex diffusion transfer is obtained by using as a silver halide emulsion a direct positive silver halide emulsion which comprises silver halide grains which contain at least 80 mol % of bromide, the surface of said silver halide grains having thereon an electron acceptor and at least one sensitizing dyes selected from the group consisting of those having the following general formula (I): ##STR1## and those having the following general formula (II): ##STR2## (wherein Z, R.sub.1 -R.sub.3, M, A and p and q are as defined in the specification).
    Type: Grant
    Filed: October 27, 1977
    Date of Patent: November 27, 1979
    Assignee: Mitsubishi Paper Mills, Ltd.
    Inventors: Akio Yoshida, Yasuo Tsubai, Seigo Ebato