Patents Examined by Thovl Chea
  • Patent number: 4914002
    Abstract: A silver halide negative photographic material comprising a support having thereon at least one silver halide emulsion layer, at least one hydrophilic colloidal layer thereof containing (1) a hydrazine derivative, (2) a compound substantially having no absorption maximum in the visible light region represented by formula (I): ##STR1## wherein Z.sup.11, Z.sup.12, R.sup.11, R.sup.12 X and n are as defined in the specification, and (3) at least one compound represented by formula (II) or (III): ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and Q are as defined in the specification; and ##STR3## wherein R.sub.21, R.sub.22, R.sub.23, and R.sub.24, are as defined in the specification. The photographic material can be processed with a stable developer to provide an ultra-high contrast image without reduction in sensitivity, gamma or maximum density or the appearance of black pepper. The photographic material is excellent in pressure properties and anti-blocking properties.
    Type: Grant
    Filed: November 4, 1988
    Date of Patent: April 3, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobuaki Inoue, Hisashi Okada, Shigeo Hirano, Kimitaka Kameoka, Tetsuo Yoshida, Morio Yagihara