Antifoggant Patents (Class 430/489)
  • Patent number: 4416970
    Abstract: Image transfer photographic assemblages, processes, compositions and cover sheets are described which employ a manganous compound. After processing, the manganous compound is capable of diffusing to the silver halide emulsion layer and a redox dye-releaser associated therewith to inhibit further dye release. Post-process D.sub.min stability is thereby improved.
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: November 22, 1983
    Assignee: Eastman Kodak Company
    Inventor: Thomas O. Maier
  • Patent number: 4414305
    Abstract: An image-forming method is disclosed. The method includes providing a silver halide color photographic material and imagewise exposing that material. The exposed material is color developed in the presence of a compound capable of reacting with or adsorbing a silver halide. The material is developed within a mono-bath intensifying developing solution which includes hydrogen peroxide or a compound capable of releasing hydrogen peroxide and a color developing agent. The solution substantially excludes the presence of bromide ions and iodide ions. The compound capable of reacting with or being absorbed into silver halide is a nitrogen-containing heterocyclic compound which has been found to be very useful in the image-forming method to obtain high color density with materials containing a small amount of silver halide.
    Type: Grant
    Filed: July 28, 1982
    Date of Patent: November 8, 1983
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Koichi Nakamura, Hiroyuki Hirai
  • Patent number: 4362811
    Abstract: A processing solution composition for treating an image receiving layer in silver complex diffusion transfer process, which contains 1.7.times.10.sup.-3 to 1.7.times.10.sup.-2 mole/liter of a bromide and 2.0 to 12.0 mole-% of potassium ion based on total cations of the salts contained in the composition accelerates the transfer speed and gives a silver image high in maximum density, contrast and sharpness to the image.
    Type: Grant
    Filed: July 10, 1981
    Date of Patent: December 7, 1982
    Assignee: Mitsubishi Paper Mills Ltd.
    Inventors: Shigeru Iguchi, Shozi Oka
  • Patent number: 4323642
    Abstract: Lignosulfonates are incorporated in photographic developing compositions containing an indazole antifoggant in order to prevent or retard the precipitation of the indazole. Both black-and-white developing compositions, containing such developing agents as dihydroxybenzenes and/or pyrazolidones, and color developing compositions, containing primary aromatic amino color developing agents, are effectively stabilized against precipitation of indazole antifoggants by the lignosulfonates.
    Type: Grant
    Filed: March 9, 1981
    Date of Patent: April 6, 1982
    Assignee: Eastman Kodak Company
    Inventor: Steven R. Levinson
  • Patent number: 4322493
    Abstract: A reversal development processing method for black and white silver halide photographic light-sensitive materials which comprises bleaching an imagewise exposed black and white silver halide photographic light-sensitive material with a bleaching solution containing at least one oxidizing agent capable of forming a water-soluble silver salt when reacted with the silver images of said exposed light-sensitive material in the presence of at least one bleach accelerating agent selected from the compounds represented by the general formulae (I) to (VIII) described in the specification.
    Type: Grant
    Filed: September 26, 1979
    Date of Patent: March 30, 1982
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Haruo Shibaoka, Katsumi Hayashi
  • Patent number: 4276374
    Abstract: A silver halide photographic emulsion containing the compound represented by the formula (I):R.sub.1 --(X--R.sub.3).sub.m --X--R.sub.2 (I)wherein R.sub.1 and R.sub.2 each represents an alkyl group containing 1 to 5 carbon atoms substituted with two or more substituents selected from --OH, --NHR.sub.4, --COOR.sub.4, --CONH.sub.2, --SO.sub.3 H, --COOM, or --SO.sub.3 M, R.sub.3 represents an alkylene group containing 1 to 4 carbon atoms which may be substituted by --OH, R.sub.4 represents a hydrogen atom or an alkyl group containing 1 to 5 carbon atoms, X represents a sulfur or oxygen atom, provided at least one X is a sulfur atom, m represents 0 or an integer of 1 to 4, and M represents an alkali metal atom.
    Type: Grant
    Filed: May 30, 1979
    Date of Patent: June 30, 1981
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroyuki Mifune, Nobuaki Miyasaka, Yoshiharu Fuseya
  • Patent number: 4252892
    Abstract: A poly(alkyleneimine), such as poly(ethyleneimine), is incorporated in a photographic color developer composition containing a primary aromatic amino color developing agent in order to protect the developing agent against aerial oxidation. The poly(alkyleneimine) also functions to reduce tar formation and retard stain growth and provides a supplemental source of alkalinity in the color developer composition.
    Type: Grant
    Filed: December 10, 1979
    Date of Patent: February 24, 1981
    Assignee: Eastman Kodak Company
    Inventor: Nelson S. Case
  • Patent number: 4212672
    Abstract: A lithographic photosensitive material, suitable for exposure with light from a neon-helium laser, comprising a support having thereon a silver halide emulsion layer containing at least one sensitizing dye represented by the following general formula (I): ##STR1## wherein Z and Z.sub.1, which may be the same or different, each represents the non-metal atoms necessary for completing a 5-membered or 6-membered nitrogen-containing heterocyclic nucleus; R and R.sub.1, which may be the same or different, each represents an alkyl group or an aryl group; Q and Q.sub.1 together represent the non-metal atoms necessary for completing a 4-thiazolidinone, 5-thiazolidinone, or 4-imidazolidinone nucleus; L, L.sub.1 and L.sub.2 each represents a methine group; n.sub.1 and n.sub.
    Type: Grant
    Filed: July 12, 1978
    Date of Patent: July 15, 1980
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yuji Mihara, Haruo Takei, Noriyuki Inoue