Bleach-fix Patents (Class 430/400)
  • Patent number: 7351522
    Abstract: An object of the present invention is to provide a method of processing silver halide color paper that ensures (a) promptness such that finished prints can be handed at shop to customers, (b) small installation area for mini-labs, (c) processing solution stability capable of withstanding slack seasons, (d) normal image quality, (e) small replenishment solution amount and (f) inhibition of tar generation and sulfuration phenomenon occurrence. This object can be attained by a concentrated processing composition for color paper which has a concentrated processing composition for bleach replenishment of 3.0 or less in pH containing 0.3 mol/L or more of EDTA.Fe(III) ammonium, 0.3 mol/L or more of a sulfinic acid compound of specified structure and 0.5 mol/L or more of ammonium bromide and a concentrated processing composition for fixative replenishment of 4.0 or more in pH containing 0.7 mol/L of ammonium thiosulfate and 0.
    Type: Grant
    Filed: August 15, 2005
    Date of Patent: April 1, 2008
    Assignee: Fujifilm Corporation
    Inventor: Kazuaki Yoshida
  • Patent number: 7160674
    Abstract: A bundle for simultaneous refilling of chemicals for processing color photography silver halide materials in an automatic processing apparatus, wherein the bundle comprises at least one bottle with the refilling solution for a color developer and at least two bottles with refilling solutions for a bleach-fixing bath, characterized in that the bottle with the refilling solution for the color developer comprises more than 60 g of color developer substance per 1 L of bottle volume, is distinguished in that the capacity of the bundle is increased.
    Type: Grant
    Filed: July 29, 2004
    Date of Patent: January 9, 2007
    Assignee: A&O Imagining Solutions GmbH
    Inventor: Ralf Wichmann
  • Patent number: 6949331
    Abstract: A method of enabling reuse of photographic processing waste solutions with ease at low cost without discharging effluents in a substantial sense, and a photographic processing agent regenerated by such a method are provided, which is a method of reusing a photographic processing waste solution, in which a solidified matter is prepared from the photographic processing waste solution by a dry-solidification according to a thin film concentration method without removing ingredients accumulated during a processing, the solidified matter is formed into granules, and the granules is reused as a solid photographic processing agent: and a regenerated processing agent prepared by the aforesaid method.
    Type: Grant
    Filed: February 25, 2004
    Date of Patent: September 27, 2005
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takatoshi Ishikawa
  • Patent number: 6893807
    Abstract: A photographic processing system, which contains: solidifying a photographic processing waste solution, to give a solidified matter thereof; and reusing part of the solidified matter as a solid processing agent.
    Type: Grant
    Filed: August 12, 2003
    Date of Patent: May 17, 2005
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hideaki Nomura, Takatoshi Ishikawa
  • Patent number: 6875359
    Abstract: A developer liquid regenerating system is provided with a storage tank storing a TAAH (such as TMAH)- and photoresist-containing developer waste liquid, first separating means with NF membrane, connected to the waste liquid storage tank through conduits, a storage tank connected to the first separating means through a conduit, and second separating means with NF membrane, connected to the storage tank through conduits. The developer liquid regenerating system is also connected to a developing apparatus through a conduit connected to the storage tank, and to a developer liquid control/supply apparatus through a conduit connected to the storage tank.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: April 5, 2005
    Assignees: Nagase & Co., Ltd., Nagase CMS Technology Co., Ltd.
    Inventors: Shu Ogawa, Yasuyuki Kobayakawa, Yoshiya Kitagawa, Makoto Kikukawa
  • Publication number: 20040241597
    Abstract: A method for preparing a bleach-fixing processing solution for a silver halide color photographic light sensitive material, the method comprising the step of:
    Type: Application
    Filed: May 25, 2004
    Publication date: December 2, 2004
    Applicant: Konica Minolta Photo Imaging, Inc.
    Inventors: Hiroaki Kobayashi, Atsuro Yanata, Satoshi Okano
  • Publication number: 20040157172
    Abstract: A method of processing photographic color papers is carried out using a photographic bleach-fixing composition in a bleach-fixing step that is carried out for less than 60 seconds. The bleach-fixing composition comprises certain aliphatic or aromatic sulfur-containing compounds that include a —N═C(SH)— group. The bleach-fixing composition can be prepared from a two-part bleach-fixing kit having two solutions that can be added directly to a processing chamber or premixed to form a replenisher solution.
    Type: Application
    Filed: February 7, 2003
    Publication date: August 12, 2004
    Applicant: Eastman Kodak Company
    Inventors: Paul A. Schwartz, Valerie L. Kuykendall, Eric R. Schmittou, Leif P. Olson, Susan M. Flavin
  • Patent number: 6723247
    Abstract: The invention relates to a low-water-consumption method for processing an exposed color reversal photographic film. This method comprises the circulation of this exposed film in: i) a black and white development bath, ii) a first washing bath, iii) a reversal bath comprising at least a buffer agent liable to pass through a nanofiltration membrane and, in addition, the collection of waters leaving the said reversal bath, the circulation of these waters through a nanofiltration device to produce a permeate that is recycled in the said first washing bath, a water volume at least equivalent to that supplied by the said permeate being rejected via the overflow and the said buffer agent being chosen so as to keep the pH in the first washing bath between 5 and 7.
    Type: Grant
    Filed: April 16, 2002
    Date of Patent: April 20, 2004
    Assignee: Eastman Kodak Company
    Inventor: Didier J. Martin
  • Publication number: 20040052517
    Abstract: A photographic processing system, which contains: solidifying a photographic processing waste solution, to give a solidified matter thereof; and reusing part of the solidified matter as a solid processing agent.
    Type: Application
    Filed: August 12, 2003
    Publication date: March 18, 2004
    Inventors: Hideaki Nomura, Takatoshi Ishikawa
  • Patent number: 6702487
    Abstract: A photographic processor for a silver halide photographic material is disclosed, comprising a means for supplying a replenisher or water in accordance with processing amount information, wherein the processor further comprises a correction means for correcting the replenisher- or water-supplying rate on the basis of measurement data of a specific gravity or a pH of the processing solution. A remote control system of the processor is also disclosed, which is connected to a host computer through communication network.
    Type: Grant
    Filed: March 26, 2002
    Date of Patent: March 9, 2004
    Assignee: Konica Corporation
    Inventors: Junichi Kohno, Hiroaki Kobayashi
  • Publication number: 20040038158
    Abstract: An image forming method including a step of imagewise exposing a silver halide color photographic photosensitive material having, on a support, photographic constituent layers including at least one blue sensitive silver halide emulsion layer, at least one green sensitive silver halide emulsion layer, at least one red sensitive silver halide emulsion layer, and at least one non-photosensitive hydrophilic colloid layer, a color developing step, a bleach-fixing step and a rinsing step. At least one of the at least one red sensitive silver halide emulsion layer contains at least one compound represented by the following general formula (IA) and/or at least one coupler represented by the following general formulae (PTA-I) and (PTA-II).
    Type: Application
    Filed: April 23, 2003
    Publication date: February 26, 2004
    Applicant: FUJI PHOTO FILM CO., LTD.
    Inventors: Shin Soejima, Kentaro Okazaki
  • Publication number: 20040023167
    Abstract: A concentrated blix solution composition, which can remarkably reduce the replenishing amount of the blix solution and/or remarkably reduce the blix time, comprises: 1) a concentrated composition part containing a bleaching agent; and 2) a concentrated composition part containing a fixing agent, wherein the part concentrated composition 1) satisfies all the following conditions: (1) pH is from 2.0 to 3.5, (2) a specific gravity is 1.130 or more, (3) the bleaching agent comprises an iron(III) complex salt of an aminopolycarboxylic acid, (4) a concentration of the bleaching agent is from 0.5 to 1.0 mole/L, and (5) a content of an aminopolycarboxylic acid having not been complexed is from 0.1 to 3% by mole based on the bleaching agent, and a processing process using the same.
    Type: Application
    Filed: July 18, 2003
    Publication date: February 5, 2004
    Applicant: FUJI PHOTO FILM CO., LTD.
    Inventor: Kazuaki Yoshida
  • Patent number: 6645708
    Abstract: A cartridge that supplies fresh photographic processing solution or chemistry to a photoprocessing machine and recovers silver from spent processing solution. The cartridge is designed to integrate a solution supply system and a silver recovery system to facilitate the collection of silver from spent processing solution, form a less-regulated spent solution and reduce chemical exposures to operators of photoprocessing systems.
    Type: Grant
    Filed: June 13, 2002
    Date of Patent: November 11, 2003
    Assignee: Eastman Kodak Company
    Inventors: Robert B. Call, Jay E. Mathewson, Donna M. Timmons, Richard R. Horn
  • Publication number: 20030198902
    Abstract: A photographic processing composition, containing at least one compound of formula (I) or (II):
    Type: Application
    Filed: January 24, 2003
    Publication date: October 23, 2003
    Inventors: Makoto Suzuki, Yasufimi Nakai
  • Publication number: 20030194661
    Abstract: This relates to a method of rendering a used photographic processing solution less corrosive to low carbon steel comprising:
    Type: Application
    Filed: May 12, 2003
    Publication date: October 16, 2003
    Inventors: Eric R. Schmittou, Cynthia A. Salsedo
  • Publication number: 20030129529
    Abstract: The present invention describes modified pigment products comprising a pigment having attached at least one photopolymerizable group and at least one ionic or ionizable group. Dispersions, black matrixes, and resin compositions comprising these modified pigment products are also disclosed.
    Type: Application
    Filed: January 7, 2003
    Publication date: July 10, 2003
    Inventors: Eugene N. Step, James A. Belmont
  • Patent number: 6534253
    Abstract: Photographic bleach-fixing solutions in a processing chamber can be directly replenished using a single-part photographic bleach-fixing “precursor” composition that comprises one or more iron-ligand complexes, one or more thiosulfates as the sole fixing agents, and optionally, a sulfite preservative. At least 50 mol % of the iron in the composition is in the form of Fe(II). Immediately prior to or during directly supplying the precursor composition to the processing chamber from an enclosed container, sufficient ferrous ions are converted to ferric ions to provide desired bleaching in the processing chamber.
    Type: Grant
    Filed: November 15, 2001
    Date of Patent: March 18, 2003
    Assignee: Eastman Kodak Company
    Inventors: Valerie L. Kuykendall, Sheridan E. Vincent, Daniel R. English
  • Publication number: 20020164551
    Abstract: Stable, single-part photographic bleach-fixing “precursor” compositions comprise one or more iron-ligand complexes, one or more thiosulfates as the sole fixing agents, and optionally, a sulfite preservative. At least 50 mol % of the iron in the composition is in the form of Fe(II). This composition can be used directly in photoprocessing, or used as a regenerator when mixed with bleach-fixing overflow to provide a replenishing solution. Because the Fe(II) compounds are precursor bleaching agents, they must be oxidized to Fe(III) for active bleaching prior to or during the photographic processing operations.
    Type: Application
    Filed: April 3, 2002
    Publication date: November 7, 2002
    Inventors: Sheridan E. Vincent, Valerie L. Kuykendall, Jean M. Buongiorne
  • Publication number: 20020160322
    Abstract: Stable, single-part photographic bleach-fixing “precursor” compositions comprise one or more iron-ligand complexes, one or more thiosulfates as the sole fixing agents, and optionally, a sulfite preservative. At least 50 mol % of the iron in the composition is in the form of Fe(II). This composition can be used directly in photoprocessing, or used as a regenerator when mixed with bleach-fixing overflow to provide a replenishing solution. Because the Fe(II) compounds are precursor bleaching agents, they must be oxidized to Fe(III) for active bleaching prior to or during the photographic processing operations.
    Type: Application
    Filed: April 3, 2002
    Publication date: October 31, 2002
    Inventors: Sheridan E. Vincent, Valerie L. Kuykendall, Jean M. Buongiorne
  • Publication number: 20020142253
    Abstract: A cartridge that supplies fresh photographic processing solution or chemistry to a photoprocessing machine and recovers silver from spent processing solution. The cartridge is designed to integrate a solution supply system and a silver recovery system to facilitate the collection of silver from spent processing solution, form a less-regulated spent solution and reduce chemical exposures to operators of photoprocessing systems.
    Type: Application
    Filed: March 30, 2001
    Publication date: October 3, 2002
    Applicant: Eastman Kodak Company
    Inventors: Robert B. Call, Jay E. Mathewson, Donna M. Timmons, Richard R. Horn
  • Patent number: 6451519
    Abstract: A ferric-EDTA bleach regenerator composition can be mixed with bleach overflow to provide a bleach replenisher for reversal color silver halide photographic processes. The bleach regenerator composition has a critically controlled pH between about 6.0 and about 6.5, and comprises a total bromide ion concentration of at least about 210 g/l, and ferric ion in an amount of at least about 50 g/l. At least 50% of the bleach overflow and the bleach regenerator composition are mixed in at least a 1:1 volume ratio. After pH adjustment to from about 5.4 to about 5.6, the pH adjusted replenisher is supplied to the bleach tank for use in the process.
    Type: Grant
    Filed: January 3, 1997
    Date of Patent: September 17, 2002
    Assignee: Eastman Kodak Company
    Inventors: Mary Ellen Craver, Jean Marie Buongiorne, Michael John Haight
  • Patent number: 6440651
    Abstract: Concentrated aqueous photographic fixing compositions include a photographic fixing agent and a compound represented by Structure I wherein R is carboxy or sulfo, m is an integer of from 0 to 7 and n is an integer of from 2 to 5. This compound is provided in a concentrated aqueous fixer additive composition. These compositions can be used to provide images in color photographic materials, and particularly in color reversal films, with reduced residual sensitizing dye stain.
    Type: Grant
    Filed: October 5, 2000
    Date of Patent: August 27, 2002
    Assignee: Eastman Kodak Company
    Inventors: Jean M. Buongiorne, Mary E. Craver, Ramanuj Goswami
  • Patent number: 6387243
    Abstract: A method for separating metal ions absorbed on a resin includes: suspending or percolating a cationic exchange resin charged with a polar solvent containing an eluting agent or a mixture of eluting agents containing at least an organic or mineral ligand complexing the metal ions to be separated; circulating a direct electric current, whether constant or not, in the charged eluting solution forming an electrolyte so as to recuperate at least a metal by deposition; and finally optionally repeating the last step by setting up one or several cathode(s) made of another metal and by re-adjusting the cathode potential and the anode/cathode potential difference to new values, depending on the new type of metal to be recuperated. An installation for treating/recycling photographic bath waste includes an exchanger connected to a tank for waste bath to be treated, to a treated waste bath tank, to a regenerating solution tank and to an electrolysis vessel.
    Type: Grant
    Filed: December 14, 1999
    Date of Patent: May 14, 2002
    Inventor: Gerard Gasser
  • Publication number: 20020037482
    Abstract: A bleach or bleach/fixing solution for processing photographic silver halide materials which, relative to the silver halide content of the unprocessed material, exhibit prior to the bleaching step a content of silver arising from development of at least 65 mol %, in particular for processing color reversal materials, characterized in that the solution contains at least one iron complex of propylenediaminetetraacetic acid or of &bgr;-alaninediacetic acid or a mixture of these complexes and the total concentration of the stated iron complexes in the solution is at least 0.045 and at most 0.25 mol/l and a process for processing, in which such a solution is used, is characterized by a small introduced quantity of iron complexes, a low residual silver content, a low bleaching fog value, elevated resistance to precipitation and in that the bleach solution may be rejuvenated.
    Type: Application
    Filed: August 1, 2001
    Publication date: March 28, 2002
    Inventors: Ralf Wichmann, Thomas Hubsch, Thomas Stetzer
  • Publication number: 20020031733
    Abstract: A method to improve the functioning of a membrane of a nanofiltration device provided to filter a solution optimizes the retention rate of the membrane. In the method, the permeate and the retentate are circulated through the nanofiltration membrane for a time before starting to use the membrane. The method is applicable to the treatment of photographic baths.
    Type: Application
    Filed: July 18, 2001
    Publication date: March 14, 2002
    Applicant: Eastman Kodak Company
    Inventor: Didier J. Martin
  • Patent number: 6180326
    Abstract: This invention concerns photographic processing, and specifically the decontamination of effluents from photographic processing. This invention consists in placing the effluents in contact with a heat-reversible polymer in the form of hydrogel particles, for a long enough time for the polymer to adsorb the contaminants from the effluent, in then removing the heat-reversible polymer from the effluent, and in then cooling the heat-reversible polymer to extract the contaminants from it. This invention is useful for the elimination of tars that are formed in photographic baths during processing.
    Type: Grant
    Filed: December 15, 1999
    Date of Patent: January 30, 2001
    Assignee: Eastman Kodak Company
    Inventor: Olivier C. Poncelet
  • Patent number: 6132941
    Abstract: A method of replenishing a processing solution by adding the replenisher directly to the surface of the emulsion side of the material to be processed. This accelerates the processing of the material and maintains the sensitometry of the processing solution.
    Type: Grant
    Filed: December 14, 1999
    Date of Patent: October 17, 2000
    Assignee: Eastman Kodak Company
    Inventor: Peter J. Twist
  • Patent number: 6117315
    Abstract: The invention relates to a process and apparatus for the treatment of photographic films. The film circulates in a series of processing baths, each of these baths comprising a washing area each comprising one or more tanks, the waste water from all the washing areas is recovered and treated in a single nanofiltration device, common to all the processing baths, the water hardness of the permeate from the nanofiltration device is adjusted, and the permeate is recycled to each of the washing areas of each of the processing baths.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: September 12, 2000
    Assignee: Eastman Kodak Company
    Inventor: Jean-Pierre R. Masson
  • Patent number: 6083673
    Abstract: The present invention concerns an organic/inorganic developer composition comprising a regeneratable iron chelate, novel codevelopers of the phenidone type including one or more solubilizing groups that are not directly attached to the phenyl nucleus or to the pyrazolidino nucleus and optionally ascorbic acid. These compositions are particularly useful for the black-and-white development of films or photographic papers, in particular for the fast development of radiographic products.
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: July 4, 2000
    Assignee: Eastman Kodak Company
    Inventors: Jacques Roussilhe, Siu Chung Tsoi
  • Patent number: 5989433
    Abstract: The present invention concerns a method of extracting halide ions contained in a photographic processing solution. The invention concerns a method for the selective extraction of halide ions using a separative membrane comprising a support covered with an active layer comprising an inorganic hydrogel material and an ion carrier, one of the faces of the support having been surface-modified. This method effectively regenerates photographic solutions.
    Type: Grant
    Filed: April 20, 1998
    Date of Patent: November 23, 1999
    Assignee: Eastman Kodak Company
    Inventors: Didier J. Martin, Olivier J. Poncelet, Jeannine Rigola
  • Patent number: 5981152
    Abstract: A method for processing a black-white silver halide photographic light-sensitive material by an automatic processor comprising the following steps,a step for preparing a processing solution by dissolving a solid processing composition or a condensed processing solution in a dissolving tank,a step for supplying said processing solution from said dissolving tank to a processing tank,a step for supplying part of said processing solution used for processing in said processing tank to said dissolving tank,wherein said black-white silver halide photographic light-sensitive material is processed with said processing solution in said processing tank and the flow of said processing solution from said processing tank to said dissolving tank is irreversible.
    Type: Grant
    Filed: December 11, 1998
    Date of Patent: November 9, 1999
    Assignee: Konica Corporation
    Inventor: Hideki Komatsu
  • Patent number: 5972576
    Abstract: The invention concerns a method for decontaminating a used photographic processing bath.This method consists of putting the processing bath in contact with a heat-reversible hydrophilic polymer which becomes hydrophobic above a temperature lower than the temperature of the processing bath.The tars and other organic contaminants present in the used photographic processing bath can be removed by cooling the heat-reversible polymer below the temperature where it becomes hydrophilic.
    Type: Grant
    Filed: November 19, 1998
    Date of Patent: October 26, 1999
    Assignee: Eastman Kodak Company
    Inventors: Olivier J. Poncelet, Danielle M. Wettling, Jeannine Rigola
  • Patent number: 5961939
    Abstract: There is provided a method for removing silver from photoprocessing solutions containing hardening agents which comprises:a) adding a chelating agent to the photoprocessing solution in an amount sufficient to inhibit the precipitation of the high valent cations of the hardening agents;b) adding a base to adjust the pH of the photoprocessing solution to a value above 5.5; andc) adding a chemical precipitant for the silver contained in the photoprocessing solution;and optionally adding as a final component a flocculating agent which causes the precipitate to grow in size.
    Type: Grant
    Filed: April 2, 1998
    Date of Patent: October 5, 1999
    Assignee: Eastman Kodak Company
    Inventors: James R. Kulp, Charles S. Christ, Jr., Jay E. Mathewson
  • Patent number: 5958245
    Abstract: The invention concerns a method and a device for the selective extraction of the halide ions from photographic baths. According to the invention, the solutions to be treated are subjected to a first nanofiltration step 2 in diafiltration mode, then to a second nanofiltration step 3 in concentration mode. The method makes it possible to prolong the activity of the fixing or bleaching/fixing baths during the processing of photographic products.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: September 28, 1999
    Assignee: Eastman Kodak Company
    Inventors: Didier J. Martin, Christian G. Guizard, Jean-Francois Diaz
  • Patent number: 5958657
    Abstract: A process for regenerating spent fixer solution which includes the steps of adding finely particulate zinc, such as zinc dust, to the solution to cause silver dissolved therein to precipitate and removing the precipitate from the solution hereby producing a regenerated fixer solution.
    Type: Grant
    Filed: February 9, 1999
    Date of Patent: September 28, 1999
    Assignee: Marcel Sciarone
    Inventor: Jakob Van Rouendal Smit
  • Patent number: 5928843
    Abstract: A method for processing exposed silver-based photographic material comprises passing the exposed material through a bath of developer liquid and subsequently through a bath of fixer liquid. Silver from used fixer liquid is recovered by electrolysis. The fractional image exposure of exposed material to be processed in a coming period and the amount-of silver recovered by electrolysis in a preceding period are measured. The used fixer liquid is periodically regenerated by the addition of fresh fixer thereto. The quantity of fresh fixer to be added is calculated as a function of the measured fractional image exposure and as a function of the measured amount of recovered silver. The quality of the fixer is thereby maintained at an optimum level while keeping the quantity of fresh fixer which is used to a minimum.
    Type: Grant
    Filed: April 3, 1998
    Date of Patent: July 27, 1999
    Assignee: Agfa-Gevaerf
    Inventor: Werner Van de Wynckel
  • Patent number: 5922520
    Abstract: Silver halide photosensitive material after exposure is processed by developing it with a developer solution and then processing it with a processing solution having bleaching function and/or a processing solution having fixing function, while placing the developer solution and/or said processing solution having fixing function in contact with the other processing solution and/or an electrolyte solution through an anion exchange membrane, placing a cathode in the developer solution and/or the processing solution having fixing function and an anode in the other processing solution and/or the electrolyte solution, and conducting electricity therebetween.
    Type: Grant
    Filed: August 20, 1993
    Date of Patent: July 13, 1999
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takashi Nakamura, Yasuhisa Ogawa
  • Patent number: 5888707
    Abstract: A method of processing photographic material comprises developing the photographic material by treatment with a developer (26), and fixing the developed photographic material by treatment with a fixer (32, 38) while reducing the level of silver ions in the fixer (38) by electrolysis. Between the developing and the fixing, the photographic material is treated with an intermediate treatment liquid (44) for a period of time less than the treatment time with the fixer (32, 38). The intermediate treatment liquid (44) contains used fixer (38). The efficiency of fixing is improved without the use of substantially greater liquid volumes and in particular without the use of further quantities of water.
    Type: Grant
    Filed: November 24, 1997
    Date of Patent: March 30, 1999
    Assignee: Agfa-Gevaert
    Inventors: Benedictus Jansen, Frank Michiels
  • Patent number: 5858630
    Abstract: The present invention concerns a process for treating photographic baths containing organic contaminants and a device for implementing this method.The process for treating a photographic bath containing contaminants comprises the step of putting the photographic bath in contact with a photographically inert material, resistant to a high pH and having a lipophilic surface.This method affords an improvement in the processing of photographic products.
    Type: Grant
    Filed: August 28, 1997
    Date of Patent: January 12, 1999
    Assignee: Eastman Kodak Company
    Inventors: Olivier J. Poncelet, Jeannine Rigola, Danielle M. Wettling
  • Patent number: 5858631
    Abstract: The processing of exposed colour photographic materials by at least the steps of colour developing and bleach-fixing, with electrolytic desilvering of the spent bleach fixative solution, results in better utilisation of the processing chemicals and in a reduced amount of liquid to be disposed of, when bleach-fixing is effected in 2 steps, wherein a pH of .gtoreq.7.4 is set in the 1st step and a pH of .ltoreq.7 is set in the 2nd step, the bleach fixative from the 1st step is electrolytically desilvered and acid for maintaining the pH is fed to the 2nd step.
    Type: Grant
    Filed: November 17, 1997
    Date of Patent: January 12, 1999
    Assignee: Agfa Gevaert Aktiengesellschaft
    Inventors: Udo Quilitzsch, Herbert Mitzinger
  • Patent number: 5856074
    Abstract: This invention relates to a fixing bath containing a biologically degradable complexing agent of formula I ##STR1## wherein R.sup.1-4 represents hydrogen, C.sub.1 -C.sub.10 -alkyl, hydroxy-C.sub.1 -C.sub.10 -alkyl, C.sub.1 -C.sub.10 -alkoxy-C.sub.1 -C.sub.10 -alkyl, carboxy-C.sub.2 -C.sub.10 -alkyl, dicarboxy-C.sub.1 -C.sub.10 -alkyl, carboxy-hydroxy-C.sub.1 -C.sub.10 -alkyl, hydroxy-C.sub.1 -C.sub.5 -alkyl-(oxy-C.sub.1 -C.sub.5 -alkyl).sub.n, or C.sub.1 -C.sub.5 -alkoxy-C.sub.1 -C.sub.5 -alkyl-(oxy-C.sub.1 -C.sub.5 -alkyl).sub.n,M represents hydrogen, lithium, sodium, potassium or ammonium, andn represents 1, 2, 3 or 4,the iron(III) complex salt of which does not impede electrolytic desilverisation during the regeneration of spent fixing bath.
    Type: Grant
    Filed: October 17, 1997
    Date of Patent: January 5, 1999
    Assignee: Agfa-Gevaert AG
    Inventors: Gustav Tappe, Norman Klaunzer
  • Patent number: 5834170
    Abstract: A ferric-EDTA bleach regenerator composition can be made with bleach overflow to provide a bleach replenisher for reversal color silver halide photographic processes. The bleach regenerator composition has a critically controlled pH between about 6.0 and about 6.5, and comprises a total bromide ion concentration of at least about 210 g/l, and ferric ion in an amount of at least about 50 g/l. At least 50% of the bleach overflow and the bleach regenerator composition are mixed in at least a 1:1 volume ratio. After pH adjustment to from about 5.4 to about 5.6, the pH adjusted replenisher is supplied to the bleach tank for use in the process.
    Type: Grant
    Filed: November 19, 1997
    Date of Patent: November 10, 1998
    Assignee: Eastman Kodak Company
    Inventors: Mary Ellen Craver, Jean Marie Buongiorne, Michael John Haight
  • Patent number: 5814437
    Abstract: A method for processing a silver halide photographic light-sensitive material is by an automatic processor having a processing chamber with a small volume.
    Type: Grant
    Filed: October 27, 1997
    Date of Patent: September 29, 1998
    Assignee: Konica Corporation
    Inventors: Manabu Nakahanada, Yutaka Ueda
  • Patent number: 5783374
    Abstract: A process for the processing of spent photographic baths from color processes, namely bleaching or fixing baths with a preponderant content of amonium-Fe-EDTA (ethylene diamine tetraacetic acid) as the sequestering agent, fixing baths with a preponderant content of thiosulphates, particularly ammonium thiosulphate and optionally sodium thiosulphate, and developing baths with a preponderant content of sulfate, particularly sodium sulfite is proposed, which is characterized in that, following the deposition of the silver contained in the baths, the multipart starting solution is adjusted to a pH of approximately 13.5 to 14 using NaOH and the Fe(OH).sub.3 obtained after Fe complex decomposition is separated, the remaining, first intermediate solution is adjusted to a pH of 10 by adding acid and the resulting ammonia is separated, the remaining, second intermediate solution is brought to a pH of approximately 0.
    Type: Grant
    Filed: May 16, 1997
    Date of Patent: July 21, 1998
    Inventor: Roger Noero
  • Patent number: 5780189
    Abstract: In photographic processing apparatus, the processing solutions need to be replenished as they are used up. It is known to effect replenishment of chemicals in a paper processor by determining the amount of exposure given to the paper in the printing stage of such apparatus when copying an image on a filmstrip onto photographic paper, and using that information to calculate the amount of replenishment required to compensate exactly for the chemicals used up in processing that print. Described herein is a method of using data relating to the measured optical transmittance of an image on a filmstrip in the printing stage to control replenishment of the processing solutions in the film processing stage of the apparatus and also removal of image-dependent by-products produced in processing that filmstrip.
    Type: Grant
    Filed: July 10, 1997
    Date of Patent: July 14, 1998
    Assignee: Eastman Kodak Company
    Inventor: Christopher Barrie Rider
  • Patent number: 5736304
    Abstract: A method of processing silver halide black-and-white photographic material in a processing machine which transports the material to be processed, through several processing tanks. The processing machine includes at least one tank with fixing ability and at least one tank which is either a wash or stabilizer tank. The wash or stabilizer tank furthest from the fixer tank(s) is replenished with wash or stabilizer solution. Outflow from the wash tank or stabilizer tank nearest the fixer tank(s) is passed to the nearest fixer tank together with a fixer replenishment solution to maintain the fixer's working composition. The total submersion time in the tank(s) having fixing ability is less than 25 seconds and the ratio of coated silver in the unprocessed photographic material (in g/m.sup.2) to the sum of the rates of addition to the fixer tank (in l/m.sup.2) of the wash outflow and fixer replenishment solution is greater than 10 g/l.
    Type: Grant
    Filed: May 3, 1996
    Date of Patent: April 7, 1998
    Assignee: Eastman Kodak Company
    Inventors: Christopher Barrie Rider, Mark Joseph Devaney, Jr., Paul W. Wagner, Andrew Michael Wyner
  • Patent number: 5719010
    Abstract: The present invention relates to a treatment method for treating effluents from a photographic development process, particularly a redox amplification (RX) development process, which is operated at an alkaline pH and is buffered with a phosphate buffer, said treatment method being characterized by the addition to the effluents of a Group II or Group III metal cation which forms an aqueous insoluble or substantially insoluble phosphate salt, thereby to precipitate phosphate salt from the effluent, and to reduce the pH of the effluent.
    Type: Grant
    Filed: October 29, 1996
    Date of Patent: February 17, 1998
    Assignee: Eastman Kodak Company
    Inventor: John Richard Fyson
  • Patent number: 5716766
    Abstract: A method for the electrolytic treatment of a bleach-fix bath by which an anode and a cathode that are submerged in the spent bleach-fix bath are supplied with an electric current whereby the silver dissolved in the spent bleach-fix bath as a silver complex salt is precipitated at the cathode, characterized in that the cathode is disengaged from the spent bleach-fix bath when no electric current is applied.
    Type: Grant
    Filed: May 16, 1996
    Date of Patent: February 10, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Toshio Kurokawa
  • Patent number: 5683839
    Abstract: A method of processing a black-and-white photographic silver halide material in which the material is passed though a processing machine having a number of processing tanks including a developing tank, a tank with fixing ability and one or more wash or stabiliser tanks wherein the rate of addition of wash or stabiliser solution to one or more of said wash or stabiliser tanks is a function of the concentration of silver or halide ions in one or more of the wash, stabiliser or fix tanks. No silver recovery means associated with the wash, fix or stabiliser bath is necessary.
    Type: Grant
    Filed: May 1, 1996
    Date of Patent: November 4, 1997
    Assignee: Eastman Kodak Company
    Inventor: Christopher Barrie Rider
  • Patent number: 5679503
    Abstract: The invention concerns a method and a device for extracting the halide ions from fixing or bleaching/fixing photographic solutions containing mainly thiosulfate as the fixing agent, bringing the solutions into contact with a nanofiltration module including at least two membranes of different types.The method enables the activity of the fixing or bleaching/fixing baths to be extended during the processing of photographic products.
    Type: Grant
    Filed: August 7, 1996
    Date of Patent: October 21, 1997
    Assignee: Eastman Kodak Company
    Inventors: Didier Jean Martin, Christian Gilbert Guizard, Jean-Francois Diaz