Color Developer Patents (Class 430/467)
  • Patent number: 4835092
    Abstract: A novel method for processing a silver halide color photographic material is provided, which comprises processing a silver halide color photographic material having at least one silver halide emulsion layer on a reflective support with a color-developing solution substantially free of benzyl alcohol and containing at least one compound represented by formula (I) ##STR1## wherein R.sub.1 represents a hydrogen atom, --CH.sub.2 COOH, or ##STR2## R.sub.2 represents a hydrogen atom or --COOH; n represents an integer of 0 or 1; and Z represents atoms necessary for the formation of an aromatic ring.
    Type: Grant
    Filed: February 17, 1987
    Date of Patent: May 30, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Toshio Koshimizu, Yoshihiro Fujita, Hiroshi Fujimoto
  • Patent number: 4833068
    Abstract: A developing solution composition for a silver halide color photographic material is described, comprising an aromatic primary amine color developing agent and a compound represented by formula (I) ##STR1## wherein R.sup.1 and R.sup.2, which may be the same or different each represents a hydrogen atom or a substituted or unsubstituted alkyl group; R.sup.3 represents a substituted or unsubstituted alkylene group; and the total number of carbon atoms contained in R.sup.1, R.sup.2 and R.sup.3 is at least 3.The color developer composition has improved stability and color forming properties and remarkably limits fog formation during continuous processing.
    Type: Grant
    Filed: July 21, 1987
    Date of Patent: May 23, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobutaka Ohki, Kazuto Andoh, Hiroshi Fujimoto
  • Patent number: 4801516
    Abstract: There is provided a method of processing a silver halide color photographic material which comprises processing the silver halide color photographic material with a color developer containing an aromatic primary amine color developing agent and a specific hydroxylamine compound. According to this method the stability of a color developer is improved so that the increased fogging problem in continuous processing is lessened and the processing time is shortened.
    Type: Grant
    Filed: June 24, 1987
    Date of Patent: January 31, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Morio Yagihara
  • Patent number: 4801521
    Abstract: A method for processing a silver halide color photographic material comprising the step of processing a silver halide color photographic material after imagewise exposure thereof with a color developer containing at least one aromatic primary amine developing agent and at least one hydrazine compound represented by formula (I) ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4, which may be the same or different, each represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group, provided that R.sup.1 and R.sup.2 may be linked to form a heterocyclic ring; R.sup.3 and R.sup.4 may be linked to form a heterocyclic ring; and at least two hydrazine moieties derived from the compound represented by formula (I) may be linked to form a dimer or polymer by any of R.sup.1, R.sup.2, R.sup.3, and R.sup.4.
    Type: Grant
    Filed: July 22, 1987
    Date of Patent: January 31, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobutaka Ohki, Nobuo Seto, Hideaki Naruse, Morio Yagihara, Kazuto Andoh, Takatoshi Ishikawa, Hiroshi Fujimoto
  • Patent number: 4800153
    Abstract: There is provided a method for processing a silver halide color photographic material which comprises processing the silver halide color photographic material with a color developer containing an aromatic primary amine color developing agent and a specific amino compound. According to this method the stability and color forming property of a color developer are improved so that the increased fogging problem in continuous processing is lessened and the processing time is shortened. There is also provided a color developer composition which can be used as the developer, as it is or after adjusting its composition.
    Type: Grant
    Filed: July 17, 1987
    Date of Patent: January 24, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kiyoshi Morimoto, Takatoshi Ishikawa
  • Patent number: 4798783
    Abstract: A method of processing a silver halide color photographic material in which the color developer used comprises an aromatic primary amine color developing agent and a compound of formula: ##STR1## wherein X represents a trivalent group necessary to complete a condensed ring;R.sup.1 and R.sup.2 each represents an alkylene group, an arylene group, an alkenylene group, or an aralkylene group;and, if desired, does not contain a substantial amount of benzyl alcohol to achieve improved stability and color developability of the color developer and a reduction of fog generation in the running development process.
    Type: Grant
    Filed: November 6, 1987
    Date of Patent: January 17, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Hiroshi Fujimoto, Nobutaka Ohki, Morio Yagihara
  • Patent number: 4797350
    Abstract: A process for forming a dye image is disclosed, in which a silver halide photographic light-sensitive material having a silver halide emulsion layer is developed by a color developer comprising an aromatic primary amine and an N,N- dialkylhydroxylamine. The silver halide emulsion layer contains a hydrophobic dye-forming coupler and a compound selected from the group consisting of compounds having a sterically hindered phenol group and polyalkylpiperidine compounds or the water soluble acid salt thereof. The dye image having a high maximum density and a high light-fastness can be obtained when the color developer without benzyl alcohol is used.
    Type: Grant
    Filed: April 6, 1987
    Date of Patent: January 10, 1989
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Keiji Ohbayashi, Shigeo Chino, Mitsuhiro Okumura, Kaoru Onodera
  • Patent number: 4797349
    Abstract: A method for forming a color image which comprises imagewise exposing a color photographic material comprising a reflective support having thereon at least one photosensitive layer containing a color coupler capable of forming a dye image through its coupling reaction with an oxidation product of an aromatic primary amine color developing agent and a silver halide emulsion and processing it with a color developing solution containing substantially no benzyl alcohol, wherein the color development is carried out under the condition that a substantially colorless anionic surface active agent having an unsubstituted aliphatic group, a substituted aliphatic group excluding a fluorine-substituted aliphatic group, or an unsubstituted or substituted aromatic group as a hydrophobic group; and --SO.sub.3 M, --SO.sub.2 M, --OSO.sub.3 M, or --OSO.sub.
    Type: Grant
    Filed: April 16, 1987
    Date of Patent: January 10, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Osamu Takahashi, Tadashi Ogawa, Minoru Sakai, Masaharu Toriuchi
  • Patent number: 4791048
    Abstract: A color image is formed by subjecting a silver halide photosensitive material comprising at least a photosensitive silver halide, a two equivalent coupler, a binder, and a substantially water-insoluble basic metal compound on a support, to development with a processing solution comprising a complexing compound capable of complexing reaction with the metal in ionic form of said substantially water-insoluble basic metal compound in the presence of water to release a base.
    Type: Grant
    Filed: February 19, 1987
    Date of Patent: December 13, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroyuki Hirai, Yoshiharu Yabuki, Haruhiko Iwano
  • Patent number: 4783394
    Abstract: A color image forming process is described, which comprises developing an imagewise exposed silver halide color photographic material with a color developer containing an aromatic primary amine developing agent and being substantially free of benzyl alcohol for a period of up to about 2 minutes and 30 seconds, wherein the silver halide color photographic material comprises a reflective support having thereon a blue-sensitive silver halide emulsion layer containing a yellow color-forming coupler, a green-sensitive silver halide emulsion layer contaning a magenta color-forming coupler, and a red-sensitive silver halide emulsion layer containing a cyan color-forming coupler in this order, the material further containing light-insensitive hydrophilic colloid layers between the blue-sensitive silver halide emulsion layer and the green-sensitive silver halide emulsion layer and between the green-sensitive silver halide emulsion layer and the red-sensitive silver halide emulsion layer and at least one light-insensit
    Type: Grant
    Filed: April 10, 1987
    Date of Patent: November 8, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takeshi Hirose, Kiyoshi Nakazyo, Hideaki Naruse
  • Patent number: 4774169
    Abstract: A processing solution for developing a silver halide color photographic material. The material has a color developing agent and at least one compound selected from the group consisting of an aminocarboxylic acid and an aminophosphonic acid. The processing development solution has a surface tension ranging from 20 to 60 dynes/cm.
    Type: Grant
    Filed: August 4, 1986
    Date of Patent: September 27, 1988
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Satoru Kuse, Shigeharu Koboshi, Masahiko Kon
  • Patent number: 4774167
    Abstract: A method for processing a silver halide color photographic material is provided, which comprises subjecting an imagewise exposed silver halide color photographic material having at least one silver halide emulsion layer on a reflective support to color development for a period not exceeding 2 minutes and 30 seconds using a color-developing solution containing substantially no benzyl alcohol, a sulfite in a concentration of 8.times.10.sup.-3 mol/liter or less, and a hydroxylamine in a concentration of 1.5.times.10.sup.-2 mol/liter or less, thereby achieving high color densities of the developed images and reduced fog. The effects of this method are particularly significant in photographic paper containing a pyrazoloazole type magenta coupler.
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: September 27, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Toshio Koshimizu, Takatoshi Ishikawa, Shinji Ueda
  • Patent number: 4774166
    Abstract: A method for the formation of a color image is described, wherein a silver halide color photographic material comprising a photographic layer provided on a reflective support is imagewise exposed and then subjected to development for a period of time within 2 minutes and 30 seconds with a color developer which contains an aromatic primary amine developing agent but does not substantially contain benzyl alcohol, wherein said photographic layer contains at lesat one specific non-coloring coloration accelerator selected from the group consisting of compounds represented by formulae (I) through (VII) defined in the specification.
    Type: Grant
    Filed: January 28, 1987
    Date of Patent: September 27, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Minoru Sasaki, Tadahisa Sato, Nobuo Furutachi, Takeshi Hirose
  • Patent number: 4758498
    Abstract: A processing composition for use in color diffusion transfer photograph is disclosed, comprising a compound represented formula (I): ##STR1## wherein R.sup.1 and R.sup.2 each represents an unsubstituted or substituted alkyl group, an unsubstituted or substituted aryl group, or R.sup.1 and R.sup.2 together form a ring; M represents a hydrogen atom, an alkali metal, an alkaline earth metal, or ammonium; and Y represents a sulfonyl or carbonyl group.
    Type: Grant
    Filed: October 14, 1986
    Date of Patent: July 19, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Toru Harada, Shigeru Nakamura, Hiroshi Tanabe
  • Patent number: 4756997
    Abstract: An aqueous alkaline photographic silver halide developer composition comprising a dihydroxy benzene developing agent, an auxiliary superadditive developing agent, an antifogging agent, an antioxidant and a buffering agent, characterized by the fact that the composition further comprises a stabilizing amount of an .alpha.-ketocarboxylic acid.The developer composition has a better resistance against air oxidation and can be left in continuous transport automatic processors for several days without undergoing any substantial decrease of its developing properties.The developer composition is particularly useful in a process for the formation of a high contrast silver image by developing silver halide photographic elements including at least a negative acting surface latent image type silver halide emulsion in the presence of a hydrazine compound, preferably in the additional presence of an effective amount of a contrast promoting agent.
    Type: Grant
    Filed: July 21, 1987
    Date of Patent: July 12, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Carlo Marchesano
  • Patent number: 4745047
    Abstract: A color image-forming process is disclosed, which comprises imagewise exposing a silver halide photographic material comprising a reflective support having provided thereon at least one light-sensitive silver halide emulsion layer constituted by at least two kinds of monodispersed silver halide grains containing substantially no silver iodide and substantially deffering from each other in mean grain size, and developing the exposed photographic material for a developing time of within 2 minutes and 30 seconds using a color developer containing substantially no benzyl alcohol.
    Type: Grant
    Filed: January 27, 1987
    Date of Patent: May 17, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masahiro Asami, Kazunori Hasebe
  • Patent number: 4615971
    Abstract: Developer compositions which contain a hydrolyzed polymaleic acid anhydride having improved protection against precipitation of calcium compounds.
    Type: Grant
    Filed: September 10, 1985
    Date of Patent: October 7, 1986
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventor: Helmut Haseler
  • Patent number: 4596765
    Abstract: A photographic color forming agent composition comprising an aromatic primary amine color developing agent and materials (A), (B), and (C). Material A is a compound having an aromatic ring bearing two hydroxy groups in the ortho positions thereof. Material B is a hydroxyalkylidene-diphosphonic acid metal ion chelating agent. Material C is at least one metal salt selected from the group consisting of the water-soluble metal salts of magnesium, bismuth, aluminum, zinc, barium, or zirconium. The metal salt is present in an amount in mols equivalent to or more than the amount in mols of metal ion chelating agents of B.
    Type: Grant
    Filed: December 4, 1984
    Date of Patent: June 24, 1986
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Masayuki Kurematsu, Shigeharu Koboshi
  • Patent number: 4565776
    Abstract: Oxidation inhibiting amounts of alkylated diphenyl oxide disulfonates are incorporated into photographic color developers containing primary aromatic amino color developing agents to increase clarity and inhibit the formation of tar-like precipitates in these developers. Typical disulfonates include sodium dodecyl diphenyl ether disulfonate, sodium decyl diphenyl ether disulfonate, sodium cetyl diphenyl ether disulfonate, monocetyl diphenyl ether disulfonate, dicetyl diphenyl ether disulfonate and mixtures thereof. The use of disulfonates of this type substantially eliminates the need for cosolvents such as alkanolamines to inhibit the formation of tar-like particles in the developers.
    Type: Grant
    Filed: April 29, 1985
    Date of Patent: January 21, 1986
    Assignee: Philip A. Hunt Chemical Corporation
    Inventors: Hongzoon Kim, Thomas E. Salamy
  • Patent number: 4546068
    Abstract: There is disclosed a method for processing of a light sensitive silver halide color photographic material characterized by carrying out, after an image exposure of the material, a development processing of the material in the presence of the following components (A), (B), and (C) and/or (D):(A) an aromatic primary amine color developing agent compound;(B) a manganese salt and/or a cerium salt;(C) a diphosphonic acid sequestering agent and a magnesium salt and/or a lithium salt; and(D) at least one of the sequestering agent selected from the group consisting of the compounds represented by the formulas (I), (II), (III), (IV) and (V) found in the specification.
    Type: Grant
    Filed: May 29, 1984
    Date of Patent: October 8, 1985
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventor: Satoru Kuse
  • Patent number: 4543322
    Abstract: A process for processing a color photographic silver halide light-sensitive material comprising processing the color photographic silver halide light-sensitive material with a color developer containing at least one compound represented by the general formula (I): ##STR1## wherein X is a hydrogen atom, an alkali metal atom, an ammonium group, an alkyl group, or an aryl group; Y is a substituent on the phenyl group and is a halogen atom, an alkyl group, an alkoxy group, an amino group, a hydroxyl group, a nitro group, a sulfonic acid group or a carboxylic acid group; and n is 0, 1, 2, 3 or 4. Color developers containing the compounds of the general formula (I) have greatly increased stability and thus even after long-term storage, can be used to produce developed materials having superior photographic properties.
    Type: Grant
    Filed: March 30, 1984
    Date of Patent: September 24, 1985
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takatoshi Ishikawa, Junya Nakajima
  • Patent number: 4501812
    Abstract: Color developer composition packaged in two or more concentrated parts, which on mixing with water give a ready-for-use silver halide developer solution, one part thereof comprising an aqueous concentrated solution containing a N-hydroxyalkylsubstituted p-phenylene diamine salt developing agent and a sulfite compound, said aqueous concentrated solution having a pH from 6 to 8. In particular, said N-hydroxyalkyl-substituted p-phenylene diamine developing agent is a 4-amino-3-methyl-N-ethyl-N-(.beta.-hydroxyethyl)-aniline and the molar ratio of the sulfite compound to the developing agent is higher than 1.5:1.
    Type: Grant
    Filed: February 2, 1984
    Date of Patent: February 26, 1985
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Carlo Marchesano
  • Patent number: 4482626
    Abstract: Photographic color developer compositions containing a primary aromatic amino color developing agent and an hydroxylamine are stabilized by incorporating therein certain polyamino stabilizing agents, such as N,N'-bis(2-hydroxybenzyl)ethylenediamine-N,N'-diacetic acid. Decomposition of the hydroxylamine, in the presence of heavy metals such as iron which act to catalyze the decomposition, and resultant formation of ammonia is effectively prevented by the presence in the developer composition of such stabilizing agents. Undesirable precipitate formation is also effectively avoided.
    Type: Grant
    Filed: March 30, 1984
    Date of Patent: November 13, 1984
    Assignee: Eastman Kodak Company
    Inventors: Peter J. Twist, Joseph Bailey, Stuart P. Briggs, Miroslav V. Mijovic, David T. Southby
  • Patent number: 4439519
    Abstract: A silver halide photographic light-sensitive material containing a diffusion resistant coupler, a light-sensitive silver halide and at least one compound represented by the following general formula (I) in the same layer or different layers on a support. ##STR1## wherein R.sup.1 and R.sup.2 independently represent an alkyl group having from 1 to 5 carbon atoms, a hydroxyalkyl group having from 1 to 5 carbon atoms, an alkoxyalkyl group having from 2 to 10 carbon atoms or an alkylsulfonamidoalkyl group having from 2 to 10 carbon atoms; R.sup.3 represents a hydrogen atom, an alkyl group having from 1 to 5 carbon atoms or an alkoxy group having from 1 to 5 carbon atoms; X represents a hydrogen atom or a group capable of being removed with alkali; Y represents ##STR2## and Z represents an alkyl group, an alkenyl group, an aryl group or a heterocyclic group.
    Type: Grant
    Filed: May 5, 1983
    Date of Patent: March 27, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobutaka Ohki, Ken Kawata, Isamu Itoh
  • Patent number: 4426441
    Abstract: In a dye-forming imaging material comprising (a) a dye-forming coupler, and (b) an organic reducing agent that is capable in its oxidized form of reacting with the dye-forming coupler to form a dye, improvements are provided by a reducing agent that is a ureidoaniline silver halide developing agent free of strong electron withdrawing groups. Such an imaging material can be a photographic silver halide material. The imaging material can be a photothermographic material for producing a dye image comprising, in reactive association, (a) photographic silver halide, (b) a dye-forming coupler, and (c) an oxidation-reduction image forming combination comprising (1) an organic silver salt oxidizing agent, and (2) an organic reducing agent for the organic silver salt oxidizing agent, wherein the reducing agent is a ureidoaniline which is capable in its oxidized form of reacting with the dye-forming coupler to form a dye.
    Type: Grant
    Filed: December 3, 1982
    Date of Patent: January 17, 1984
    Assignee: Eastman Kodak Company
    Inventors: Anthony Adin, Roy C. DeSelms
  • Patent number: 4423126
    Abstract: A new color-forming 4-(4'-secondary or tertiary-amino)anilino-1-carboxamidonaphthalene dye precursor in a photographic material and process enables formation of a dye image by means of cross-oxidation without the need for a coupling reaction. The color-forming 4-(4'-secondary or tertiary-amino)anilino-1-carboxamidonaphthalene dye precursor is useful in a photographic silver halide material for producing (i) a dye image, or (ii) a dye image and silver image. The exposed photographic material is processed to produce (a) a positive dye image, (b) a negative dye and negative silver image, (c) a negative dye image or (d) a positive dye image and a positive silver image. New naphthoquinoneimide dyes are also described.
    Type: Grant
    Filed: May 27, 1982
    Date of Patent: December 27, 1983
    Assignee: Eastman Kodak Company
    Inventors: James E. Klijanowicz, Csaba A. Kovacs
  • Patent number: 4414307
    Abstract: Sparingly-soluble alcohols, such as benzyl alcohol, which function to enhance photographic coupling efficiency are incorporated in photographic color developing solutions by the use of solid water-soluble alcohol-precursor compounds. The solid precursor compounds, which can be advantageously utilized as components of an all-solid photographic processing kit, comprise a solubilizing group which is cleaved by the alkaline environment of the color developing solution to form the sparingly-soluble alcohol. Examples of such solid precursor compounds which are especially advantageous in the preparation of color developing solutions are the alkali metal monobenzylcarbonates and the alkali metal monobenzylsulfites.
    Type: Grant
    Filed: February 24, 1982
    Date of Patent: November 8, 1983
    Assignee: Eastman Kodak Company
    Inventors: Jon A. Kapecki, Thomas M. Gormel, Sheridan E. Vincent
  • Patent number: 4407928
    Abstract: Photographic assemblages and processes are described employing positive-working redox dye-releasers and a processing composition containing a ketal blocked quinone which is soluble therein. After processing, when the pH is lowered, the free quinone is released for reaction with residual electron transfer agent present in the assemblage to prevent it from reacting with the dye releaser, which would otherwise cause further dye release. D.sub.min stability is thereby improved.
    Type: Grant
    Filed: June 28, 1982
    Date of Patent: October 4, 1983
    Assignee: Eastman Kodak Company
    Inventor: Noel R. Vanier
  • Patent number: 4371609
    Abstract: A method of forming dye images by processing a photographic material containing imagewise distributed catalyzer substance in the presence of hydrogen peroxide, a coupler and certain aromatic primary amine compounds.
    Type: Grant
    Filed: July 16, 1981
    Date of Patent: February 1, 1983
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Makoto Kajiwara, Akihiko Miyamoto, Keiji Ohbayashi, Masaru Iwagaki
  • Patent number: 4368255
    Abstract: A method of processing monochrome silver halide material which contains in at least one silver halide layer in addition to the normal image-forming color coupler or couplers a development inhibitor releasing compound which method comprises developing the exposed material in a color developing solution which comprises not more than 2.5 g/liter of a paraphenylene diamine color developing agent which is able to couple with the color coupler or couplers and D.I.R. compound present, the process further comprising silver halide fixing, silver image bleaching and washing steps. The developed photographic images exhibit a remarkable increase in sharpness.
    Type: Grant
    Filed: July 15, 1981
    Date of Patent: January 11, 1983
    Assignee: Ciba-Geigy AG
    Inventor: Thomas G. Borg
  • Patent number: 4348475
    Abstract: In a process for the production of photographic images exposed photographic materials are treated with a developer having an enhanced bromide ion concentration which is kept constant for the duration of the use of the developer. The advantage of the process is based on the technically uncomplicated regenerability of the developer.
    Type: Grant
    Filed: April 23, 1980
    Date of Patent: September 7, 1982
    Assignee: Agfa-Gevaert Aktiengesellschaft AG
    Inventors: Ubbo Wernicke, Heinz Meckl
  • Patent number: 4330616
    Abstract: A process of developing a color photographic material with a color developer, a diphosphonic acid and a water soluble metallic salt of magnesium, aluminum, zinc, barium or zirconium.
    Type: Grant
    Filed: July 23, 1981
    Date of Patent: May 18, 1982
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Masayuki Kurematsu, Shigeharu Koboshi
  • 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: 4322492
    Abstract: The process for the development of color photographic images with an aqueous alkaline color developer mixture comprising methyl-p-dialkylaminoaniline derivates. The process provides brilliant color photographic images avoiding coloration of the support and color fog even when processing at high temperatures.
    Type: Grant
    Filed: April 23, 1981
    Date of Patent: March 30, 1982
    Assignee: AGFA-Gevaert Aktiengesellschaft
    Inventors: Friedrich-Wilhelm Kunitz, Walter Puschel, Karl W. Schranz
  • Patent number: 4298681
    Abstract: An N,N, disubstituted p-phenylenediamine salt of a phosphoric acid selected from the group consisting of ortho-phosphoric acid, pyrophosphoric acid and polyphosphoric acid. Such a phosphate is incorporated as a color developing agent in a liquid packaged developer concentrate which subsequently is mixed with other materials contained in a multi-package receptacle and the mixture is diluted with water to form a color developer working solution (bath) for developing a colored film. The developer concentrate has the advantage that the color developing agent therein does not tend to deteriorate upon standing, as do present-day widely used commercial N,N, disubstituted p-phenylenediamine color developing agents in developer liquid concentrates, e.g.
    Type: Grant
    Filed: February 23, 1973
    Date of Patent: November 3, 1981
    Assignee: Philip A. Hunt Chemical Corp.
    Inventors: David K. Bulloch, Hong Z. Kim
  • Patent number: 4273863
    Abstract: A process of forming color images comprises imagewise exposing a silver halide photographic color image-transfer product comprising an image dye-providing compound in the presence of a silver halide developer, and treating the exposed photographic product with an alkaline processing composition in the presence of an amino acid or a combination of an acid and an amine. Color images are achieved having excellent image discrimination (Dmax-Dmin).
    Type: Grant
    Filed: July 27, 1979
    Date of Patent: June 16, 1981
    Assignee: Eastman Kodak Company
    Inventors: Jean Deabriges, Yves Ferre, Claude Goumont
  • Patent number: 4264716
    Abstract: Photographic color developer compositions containing a primary aromatic amino color developing agent and an hydroxylamine are stabilized by incorporating therein a combination of sequestering agents, one of which is an aminopolyphosphonic acid compound and another of which is an aromatic polyhydroxy compound. Decomposition of the hydroxylamine, in the presence of heavy metals such as iron which act to catalyze the decomposition, and resultant formation of ammonia is effectively prevented by the presence in the developer composition of this combination of sequestering agents. Undesirable precipitate formation is also effectively avoided.
    Type: Grant
    Filed: September 10, 1979
    Date of Patent: April 28, 1981
    Assignee: Eastman Kodak Company
    Inventors: Sheridan E. Vincent, Michael D. Purol
  • 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: 4233399
    Abstract: Pyridone dyestuffs of the formula ##STR1## are provided wherein R.sub.1 is hydrogen or an optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical or an optionally substituted amino group,R.sub.2, R.sub.3, R.sub.4 each independently represent hydrogen, halogen, alkoxy, or optionally substituted alkyl or cycloalkyl,R.sub.5 and R.sub.6 each independently represent hydrogen or an optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical or R.sub.5 and R.sub.6, R.sub.3 and R.sub.5 and R.sub.4 and R.sub.6 form heterocyclic rings,Y is hydrogen or hydroxy, --CN, --COOR.sub.7, --CONR.sub.7 R.sub.8 or --COR.sub.7 or an optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical, andZ represents --CN, --COOR.sub.9, --CONR.sub.9 R.sub.10, --SO.sub.3 H, --SO.sub.3 .crclbar. or --COR.sub.9, where R.sub.7, R.sub.8, R.sub.9 and R.sub.10 each independently represent hydrogen or an optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical.
    Type: Grant
    Filed: May 8, 1979
    Date of Patent: November 11, 1980
    Assignee: Ciba-Geigy Aktiengesellschaft
    Inventors: Rainer Kitzing, John G. V. Scott, Terence C. Webb, Graham Evans
  • Patent number: 4232112
    Abstract: In a process of developing an imagewise exposed silver halide color photographic photosensitive material with a color developing solution and then bleach-fixing with a bleach-fixing solution, the improvement which comprises adding, to at least one of the color developing solution and the bleach-fixing solution, at least one whitening agent selected from 4,4'-diaminostilbenedisulfonic acid derivatives and at least one additive selected from sulfonic acid derivatives of benzene or naphthalene, optionally containing alkyl or alkenyl groups.
    Type: Grant
    Filed: February 5, 1979
    Date of Patent: November 4, 1980
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventor: Satoru Kuse
  • Patent number: 4232113
    Abstract: Developer for use in color photography confectioned in a plurality of concentrated compositions in which one first concentrated composition is a liquid composition substantially free of water including the p-phenylenediamine compound, and possibly other components of the developer such as antioxidants, dissolved in an organic solvent.
    Type: Grant
    Filed: March 14, 1979
    Date of Patent: November 4, 1980
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Carlo Marchesano
  • Patent number: 4201584
    Abstract: Novel color forming couplers for use in silver halide color photography are described. These couplers upon oxidative coupling with an aromatic primary amino color developing agent produce dyes of improved stability against light and dyes having favorable spectral absorption characteristics. The couplers have high coupling activity and thus produce high color densities.The novel couplers are acylacetanilide compounds whereof the phenyl nucleus of the anilide group carries oxyhydrocarbon groups, preferably alkoxy groups in the 2-, 4- and 5-position with respect to the amido group.
    Type: Grant
    Filed: September 19, 1978
    Date of Patent: May 6, 1980
    Assignee: AGFA-GEVAERT N.V.
    Inventors: Marcel J. Monbaliu, Raphael K. Van Poucke
  • Patent number: 4193802
    Abstract: A silver halide photographic light-sensitive material comprising a support having thereon at least one silver halide emulsion layer, with the photographic light-sensitive material having a hydrophilic organic colloid layer containing a dispersion of a scarcely water-soluble photographic additive dissolved in an aromatic ester represented by the following general formula (I): ##STR1## wherein R.sub.1 represents an alkyl group, an alkoxy group, an acyloxy group, an aryloxy group, an alkoxycarbonyl group or a halogen atom; R.sub.2 represents a cyclic saturated hydrocarbon group; m represents an integer of 0 to 5; n represents an integer of 1 to 6; and when m and n each represents an integer of 2 or more, the substituents represented by R.sub.1 or R.sub.2 can be the same or different.
    Type: Grant
    Filed: August 15, 1978
    Date of Patent: March 18, 1980
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yasuo Mukunoki, Hideki Naito, Akio Mitsui
  • Patent number: 4192680
    Abstract: A process for developing an image-wise exposed light-sensitive silver halide color photographic material comprising developing said material with a solution containing a specified concentration range of bromide ion in the presence of at least one of certain active point substitution type yellow couplers.
    Type: Grant
    Filed: May 24, 1978
    Date of Patent: March 11, 1980
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Isamu Fushiki, Atushi Kamitakahara, Keiichi Mori
  • Patent number: 4186007
    Abstract: A new process for the regeneration of spent color developers using both an ion exchanger and certain adsorbents is described. This process preserves the capacity of the exchanger to be regenerated.
    Type: Grant
    Filed: April 17, 1978
    Date of Patent: January 29, 1980
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Heinz Meckl, Karl Lohmer