Hydrogen Peroxide Treatment Patents (Class 430/943)
  • Patent number: 6830878
    Abstract: The present invention relates to a developer comprising a developing agent and a polyalkyleneimine antioxidant being formed by the condensation of a number of alkyleneimine units and having the following formula (I): wherein R1, R2 and R3 independently represent an unsubstituted or substituted alkylene group or R2 may be H; x and y independently represent an integer from 1 to 39,999; the sum of x and y represents an integer from 10 to 40,000; and wherein the amine groups of the antioxidant have been partially oxidized with hydrogen peroxide or a compound capable of generating hydrogen peroxide, prior to the introduction of the developing agent. In a preferred embodiment, the antioxidant has been partially oxidized such that the amount of hydroxylammonium groups formed is less than half the total equivalent of the original amine before the addition of the developing agent. The developer may optionally comprise an alkaline buffer.
    Type: Grant
    Filed: October 29, 2003
    Date of Patent: December 14, 2004
    Assignee: Eastman Kodak Company
    Inventor: John R. Fyson
  • Publication number: 20040137383
    Abstract: The invention provides a method of photographic processing, comprising the steps of applying a first component of a processing solution to the surface of a silver halide photographic material to be processed and applying a second component of the processing solution to the surface of photographic material to be processed. When the applied first and second components have mixed together, the processing solution is active to oxidise silver in the photographic material. The invention also provides a photographic processor suitable for carrying out the method.
    Type: Application
    Filed: March 15, 2004
    Publication date: July 15, 2004
    Applicant: Eastman Kodak Company
    Inventor: John R. Fyson
  • Publication number: 20040121271
    Abstract: The present invention relates to a developer comprising a developing agent and a polyalkyleneimine antioxidant being formed by the condensation of a number of alkyleneimine units and having the following formula (I): 1
    Type: Application
    Filed: October 29, 2003
    Publication date: June 24, 2004
    Applicant: Eastman Kodak Company
    Inventor: John R. Fyson
  • Patent number: 6440653
    Abstract: A method of producing a photographic image in an imagewise exposed photographic material comprising one or more silver halide emulsion layers comprises developing the material with a developer solution containing a silver halide developing agent, applying to the surface of the developed material a solution of a sulphite compound that reacts with oxidised developing agent and prevents further development, and applying to the surface of the developed material a solution of an oxidant that oxidises any remaining developing agent, wherein said sulphite compound is present in an amount sufficient to react with all the oxidised developing agent and said solutions of sulphite and oxidant are applied to the material by means other than immersion in a tank.
    Type: Grant
    Filed: May 10, 2001
    Date of Patent: August 27, 2002
    Assignee: Eastman Kodak Company
    Inventors: John R. Fyson, Louis E. Friedrich
  • Publication number: 20020015922
    Abstract: A method of producing a photographic image in an imagewise exposed photographic material comprising one or more silver halide emulsion layers comprises
    Type: Application
    Filed: May 10, 2001
    Publication date: February 7, 2002
    Applicant: Eastman Kodak Company
    Inventors: John R. Fyson, Gareth B. Evans, Peter Hewitson, Jon A. Kapecki
  • Patent number: 6303279
    Abstract: An aqueous redox amplifier composition comprising a color developing agent, hydrogen peroxide or a compound which provides hydrogen peroxide and hydroxylamine or a salt thereof wherein the concentration ranges are: hydrogen peroxide from 0.5 to 10 ml/l (as 30% w/w solution), hydroxylamine or a salt thereof from 0.25 to 5.5 g/l (as hydroxylamine sulphate), and wherein the pH is in the range from 10.5 to 12.
    Type: Grant
    Filed: October 4, 1994
    Date of Patent: October 16, 2001
    Assignee: Eastman Kodak Company
    Inventor: Peter Jeffery Twist
  • Patent number: 6291147
    Abstract: A method for processing a silver halide photographic light-sensitive material comprising the following steps, a step for developing a silver halide photographic light-sensitive material in a developing solution, a step for fixing said silver halide photographic light-sensitive material which is developed in a fixing solution containing thiosulfate salt and alminum salt, a step for washing said silver halide photographic light-sensitive material which is fixed in a washing water, wherein said fixing solution does not substantially contain a boron compound but contains at least a precipitation restraining agent and said washing water contains oxidizing agent.
    Type: Grant
    Filed: February 22, 1999
    Date of Patent: September 18, 2001
    Assignee: Konica Corporation
    Inventor: Shoji Nishio
  • Patent number: 6159668
    Abstract: There is disclosed a method for forming a color-image, which method comprises 1 containing, in a light-sensitive material, a dye-forming coupler, and a compound or its precursor, that is oxidized by a silver halide, to form an oxidation product thereof, that is coupled with the coupler, to form a dye having an absorption in a visible wavelength region; 2 having a given coating silver amount; and 3 applying a peroxide-containing solution onto the light-sensitive material, by a coating method by droplet-spraying. The method can achieve both "a lowered amount of a waste solution" and "reduction in a change of the processing.
    Type: Grant
    Filed: January 6, 2000
    Date of Patent: December 12, 2000
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Toshiyuki Makuta
  • Patent number: 6156488
    Abstract: A method of processing an imagewise exposed photographic silver halide material which includes a redox amplification dye image-forming step and a bleach step using an aqueous solution of hydrogen peroxide or a compound capable of releasing hydrogen peroxide.
    Type: Grant
    Filed: June 17, 1994
    Date of Patent: December 5, 2000
    Assignee: Eastman Kodak Company
    Inventors: Peter Douglas Marsden, John Richard Fyson
  • Patent number: 6136516
    Abstract: A process for processing exposed photographic silver halide materials at least comprising the stages color development, stopping, bleaching and fixing using a bleaching bath with hydrogen peroxide as the active substance, characterized in that the stop bath contains as a buffer agent at least one carboxylic acid of the formulae I to VIII ##STR1## in which R.sub.1 to R.sub.5 mutually independently mean hydrogen, --OH, --COOM, --SO.sub.3 M, --PO(OM).sub.2, an optionally substituted alkyl residue, an optionally substituted aryl residue, an optionally substituted amino residue or a heterocyclic residue andM means hydrogen or an alkali metal atom and wherein at least one further acid group is present in the molecule, ##STR2## and at least one agent which stops development, is distinguished by improved bleaching action and the use of an environmentally friendly bleaching bath.
    Type: Grant
    Filed: May 26, 1999
    Date of Patent: October 24, 2000
    Assignee: Agfa-Gevaert N.V.
    Inventors: Thomas Fogel, Jurgen Gohmann, Norman Klaunzer
  • Patent number: 6114101
    Abstract: An aqueous redox amplifier composition comprising a color developing agent, hydrogen peroxide or a compound which provides hydrogen peroxide and a hydroxylamine compound of the formula: ##STR1## or a salt thereof wherein R.sup.1 and R.sup.2 are each a substituted or unsubstituted alkyl group of 1-4 carbon atoms and wherein the concentration ranges are:hydrogen peroxide from 0.5 to 10 ml/l (as 30% w/w solution),hydroxylamine compound from 0.5 to 15 ml/l (as an 85% solution of diethylhydroxylamine), and wherein the pH is in the range from 10.5 to 12.
    Type: Grant
    Filed: September 23, 1994
    Date of Patent: September 5, 2000
    Assignee: Eastman Kodak Company
    Inventor: Peter Jeffery Twist
  • Patent number: 6063553
    Abstract: A photographic recording material for use in redox amplification comprises a support having thereon a plurality of emulsion layers, each emulsion layer containing a color-forming coupler, and wherein the activity of the couplers is from 45 to 70% as measured by the citrazinic acid method. These materials may be developed by a redox development step which may be followed by a bleach-fix step without any intervening step. Staining is eliminated with the use of these photographic materials.
    Type: Grant
    Filed: December 19, 1997
    Date of Patent: May 16, 2000
    Assignee: Eastman Kodak Company
    Inventors: Adrian J. Codling, John R. Fyson
  • Patent number: 6060225
    Abstract: There is disclosed a method for forming a color-image, which method comprises 1 containing, in a light-sensitive material, a dye-forming coupler, and a compound or its precursor, that is oxidized by a silver halide, to form an oxidation product thereof, that is coupled with the coupler, to form a dye having an absorption in a visible wavelength region; 2 having a given coating silver amount; and 3 applying a peroxide-containing solution onto the light-sensitive material, by a coating method by droplet-spraying. The method can achieve both "a lowered amount of a waste solution" and "reduction in a change of the processing.
    Type: Grant
    Filed: March 4, 1999
    Date of Patent: May 9, 2000
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Toshiyuki Makuta
  • Patent number: 6040122
    Abstract: A bleaching bath for processing photographic silver halide materials with hydrogen peroxide as the active substance, characterised in that it contains at least one organic compound having a sulfinic acid function and a further functional group with free electron pairs, is distinguished by improved bleaching action and makes it possible to achieve continuous processing of hard to bleach photographic materials having an elevated silver content.
    Type: Grant
    Filed: May 25, 1999
    Date of Patent: March 21, 2000
    Assignee: Agfa Gevaert NV
    Inventors: Thomas Fogel, Jurgen Gohmann, Norman Klaunzer
  • Patent number: 6037110
    Abstract: A method for processing a silver halide photographic material comprises the steps of developing, fixing and washing the photographic material. The fixing step is carried out using a fixing solution comprising thiosulfate ions, and the washing step is carried out by washing the material with an aqueous solution containing an oxidizing agent capable of reacting with thiosulfate. The oxidizing agent is present in an amount sufficient to precipitate any silver in the solution.
    Type: Grant
    Filed: April 17, 1998
    Date of Patent: March 14, 2000
    Assignee: Eastman Kodak Company
    Inventors: Jeffrey K. Green, Zoe Orr
  • Patent number: 5972573
    Abstract: An image forming method of a silver halide light sensitive photographic material including a color image forming layer containing a silver halide emulsion and a dye providing material is disclosed, the image forming method comprising the steps of developing the exposed photographic material with a first processing solution and subjecting the developed photographic material to amplification with a second processing solution, wherein the first processing solution contains a black-and-white developing agent and a color developing agent.
    Type: Grant
    Filed: April 14, 1998
    Date of Patent: October 26, 1999
    Assignee: Konica Corporation
    Inventors: Kazuhiro Miyazawa, Shigeo Tanaka, Noriyuki Kokeguchi, Yoshihiko Suda, Junji Ito
  • Patent number: 5968721
    Abstract: A process for the redox development of an imagewise exposed photographic recording material comprises developing the photographic material in a redox developer/amplifier solution containing peroxide as an oxidizing agent, hydroxylamine as an antioxidant, and to improve the stability of the solution under aeration conditions, an effective amount of a mono or di-N-substituted hydroxylamine. The molar ratio of hydroxylamine to N-substituted hydroxylamine may be from 1:200 to 100:1. The substituents in the mono- or di-N-substituted hydroxylamine may be substituted or unsubstituted monovalent organic groups having 1 to 12 carbon atoms.
    Type: Grant
    Filed: November 13, 1997
    Date of Patent: October 19, 1999
    Assignee: Eastman Kodak Company
    Inventor: Peter J. Twist
  • Patent number: 5968717
    Abstract: A process for forming a photographic image includes a color development step and a combined bleach/redox amplification step. The bleach amplification step is effected by applying to the surface of the photographic paper or other material an amount of bleach/redox amplifier solution in the range from 20 to 500 ml/m.sup.2. The solution applied to the surface is used once only and contains hydrogen peroxide or a peroxide releasing compound.
    Type: Grant
    Filed: March 4, 1998
    Date of Patent: October 19, 1999
    Assignee: Eastman Kodak Company
    Inventor: Nigel Richard Wildman
  • Patent number: 5965334
    Abstract: A process for the development of an imagewise exposed photographic recording material containing more than 200 mg/m.sup.2 of silver comprises subjecting the photographic recording material to a development/amplification step using a developer/amplifier solution containing an oxidizing agent, and controlling the process temperature within the range of from 20 to 50.degree. C. and the process time between 5 and 20 seconds. After the development/amplification step, the photographic material can be immediately subjected to a bleach-fix step, and staining is avoided.
    Type: Grant
    Filed: December 19, 1997
    Date of Patent: October 12, 1999
    Assignee: Eastman Kodak Company
    Inventors: John R. Fyson, Helen M. Redfearn
  • Patent number: 5925504
    Abstract: A silver halide material can be processed using a redox amplification developer solution and a bleach solution. Both solutions contain a peroxide oxidant.
    Type: Grant
    Filed: October 20, 1997
    Date of Patent: July 20, 1999
    Assignee: Eastman Kodak Company
    Inventor: John Richard Fyson
  • Patent number: 5916739
    Abstract: An image forming method of a silver halide light sensitive photographic material having at least one color image forming layer containing a silver halide emulsion and a dye forming coupler, the image forming method comprising the steps of exposing the photographic material to light and subjecting the exposed photographic material to amplification development to form a dye image, wherein the color image forming layer contains a coupler capable of forming a dye, upon development, having a molar extinction coefficient at a wavelength of an absorption maximum of 60,000 or more.
    Type: Grant
    Filed: November 18, 1997
    Date of Patent: June 29, 1999
    Assignee: Konica Corporation
    Inventors: Kazuhiro Miyazawa, Shigeo Tanaka
  • Patent number: 5910397
    Abstract: The present invention concerns a novel method of processing a photographic product. In particular, method includes processing a photographic product that comprises a step of surface washing with a solution comprising an oxidizing agent, and a wetting agent. This processing method affords effective washing with a reduced quantity of water.
    Type: Grant
    Filed: April 17, 1998
    Date of Patent: June 8, 1999
    Assignee: Eastman Kodak Company
    Inventors: Christiane B. Feumi-Jantou, Zoe Orr, Jeffrey K. Green
  • Patent number: 5900353
    Abstract: Photographic materials are processed by color development and a peroxide amplifier solution. The color developer contains an alkali metal phosphate and has a pH of 11 to 12.
    Type: Grant
    Filed: July 25, 1996
    Date of Patent: May 4, 1999
    Assignee: Eastman Kodak Company
    Inventor: Nigel Richard Wildman
  • Patent number: 5879865
    Abstract: An image forming method for a silver halide photographic light sensitive material comprising a support having thereon a color image forming layer containing a silver halide emulsion and a dye forming coupler is disclosed, comprising (i) subjecting the photographic material to area modulation exposure and (ii) subjecting the exposed photographic material to amplifying development to form a color image.
    Type: Grant
    Filed: November 18, 1997
    Date of Patent: March 9, 1999
    Assignee: Konica Corporation
    Inventors: Kazuhiro Miyazawa, Shigeo Tanaka
  • Patent number: 5876906
    Abstract: High silver chloride photographic materials can be processed with a process comprising two fixing steps, one before and another after a hydrogen peroxide bleaching step. The first fixing step utilizes a sulfite fixing agent.
    Type: Grant
    Filed: August 9, 1996
    Date of Patent: March 2, 1999
    Assignee: Eastman Kodak Company
    Inventors: John Richard Fyson, Gareth Bryn Evans
  • Patent number: 5871891
    Abstract: A processing method can be used to develop sequentially both low silver and relatively high silver photographic materials in the same processor. The method includes a development step for each type of material, in any order, with a developer solution adapted for both development steps. When the lower silver photographic materials are developed, the developer solution also contains an oxidizing agent to render it a redox developer/amplifier solution. The oxidizing agent is removed or inactivated when the relatively high silver photographic materials are processed with the same developer solution.
    Type: Grant
    Filed: November 13, 1997
    Date of Patent: February 16, 1999
    Assignee: Eastman Kodak Company
    Inventors: Gareth B. Evans, Peter J. Twist
  • Patent number: 5866308
    Abstract: In the production of a colour photographic image in a continuous process comprising at least the stages a) treatment with a bath containing H.sub.2 O.sub.2 or a bath containing a compound which liberates H.sub.2 O.sub.2 and b) fixing, wherein stage b) immediately follows stage a), precipitation of silver oxide and silver is avoided if the fixing bath contains an anti-oxidant and a buffer substance in addition to the fixing agent, a molar ratio of anti-oxidant to fixing agent of >0.2 is maintained and the quantity of buffer substance is >0.4 mol/l.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: February 2, 1999
    Assignee: Agfa-Gevaert AG
    Inventors: Jurgen Gohmann, Norman Klaunzer, Arno Schmuck
  • Patent number: 5837430
    Abstract: An image forming method using a silver halide photographic light-sensitive material is disclosed The image forming method comprises the steps of (1) imagewise exposing to light a silver halide photographic material comprising a support having thereon a photographic layer including a yellow image forming silver halide emulsion layer, a magenta image forming silver halide emulsion layer and a cyan image forming silver halide emulsion layer, and (2) developing the silver halide photographic light-sensitive material with an amplifying development, in which silver halide grains contained each of the color forming layers have a silver chloride content of not less than 80 mole-%, and the number of silver halide grains per unit area in the magenta silver halide emulsion layer is larger than that in the yellow image forming silver halide emulsion layer and that in the cyan image forming silver halide emulsion layer, and the number of silver halide grains per unit area in the magenta image forming silver halide emulsio
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: November 17, 1998
    Assignee: Konica Corporation
    Inventors: Kazuhiro Miyazawa, Shigeo Tanaka
  • Patent number: 5837431
    Abstract: Processing of color photographic materials can be accomplished using an aqueous redox amplifier composition comprising a color developing agent, an antioxidant therefor, hydrogen peroxide, and a stabilizing amount of nitrite ions to reduce dye loss during storage.
    Type: Grant
    Filed: December 5, 1997
    Date of Patent: November 17, 1998
    Assignee: Eastman Kodak Company
    Inventors: Peter Jeffrey Twist, Christopher John Winscom
  • Patent number: 5821037
    Abstract: A redox developer-amplifier composition contains a color developing agent and a redox oxidizing agent. The composition also contains a stabilizing amount of Zn.sup.++ or Mg.sup.++ ions, and thus has improved stability.
    Type: Grant
    Filed: March 13, 1997
    Date of Patent: October 13, 1998
    Assignee: Eastman Kodak Company
    Inventors: Peter J. Twist, Christopher J. Winscom
  • Patent number: 5814436
    Abstract: The present invention provides a processing method which allows a silver halide color photographic material to be sufficiently desilvered and minimizes the rise in the formation of bleaching fog or stain even when it is processed in a short period of time. A novel process for the processing of a silver halide color photographic material comprising at least silver halide emulsion layer on a support which comprises subjecting the silver halide color photographic material to color development, and then processing the silver halide color photographic material with a processing solution having a bleaching capacity is provided, characterized in that said emulsion layer comprises tabular silver halide grains having ?100! major faces and a silver chloride content of 50 to 100 mol % and said processing solution having a bleaching capacity contains at least one ferric complex salt of a compound represented by the following general formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: September 29, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takatoshi Ishikawa
  • Patent number: 5783375
    Abstract: A redox amplification process with minimal steps includes processing a silver halide with an amplifier/bleach/fix solution that includes a redox oxidant capable of bleaching a silver image and a fixing agent that does not react with the redox oxidant.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: July 21, 1998
    Assignee: Eastman Kodak Company
    Inventor: Peter Jeffery Twist
  • Patent number: 5776665
    Abstract: Certain organic carbocyclic and heterocyclic compounds are useful catalysts for hydrogen peroxide bleaching agents in photographic processing methods. These compounds are oxidizable by hydrogen peroxide and reducible by silver metal at a pH of from 1 to 7, and have a chemically reversible redox couple of from about -0.20 to about +1.0 volts at the same pH. The hydrogen peroxide bleaching ability is enhanced by the presence of these compounds which can be used in the bleaching solution itself, or in a prebath solution. The combination of the organic compound with a transition metal ion co-catalyst provides a synergistic effect in bleaching acceleration.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: July 7, 1998
    Assignee: Eastman Kodak Company
    Inventor: Terrence Robert O'Toole
  • Patent number: 5773202
    Abstract: A simple and effective bleaching method includes the use of a bleaching solution including a peroxide bleaching agent and chloride ion in an amount of at least 0.35 mol/l. An organic phosphonic acid or tertiary aminocarboxylic acid can also be present for stability. The method is useful for bleaching color photographic films containing at least 20 mol % silver bromide and from 0 to about 0.5 mol % silver iodide in at least one silver halide emulsion.
    Type: Grant
    Filed: March 29, 1996
    Date of Patent: June 30, 1998
    Inventors: Shirleyanne Elizabeth Haye, Terrence Robert O'Toole, David Leroy Cole, John Michael Buchanan
  • Patent number: 5766831
    Abstract: A color photographic material is processed first by color development, then is contacted with a solution that both bleaches and provides redox amplification.
    Type: Grant
    Filed: July 25, 1996
    Date of Patent: June 16, 1998
    Assignee: Eastman Kodak Company
    Inventor: Nigel Richard Wildman
  • Patent number: 5763147
    Abstract: A simple and effective peroxide bleaching method includes the use of a bleaching solution including a peroxide bleaching agent and chloride ion in an amount of at least 0.35 mol/l. An organic phosphonic acid or tertiary aminocarboxylic acid can also be present for stability. The method is useful for bleaching high silver bromide color negative photographic films containing at least 80 mol % silver bromide and from 0.5 to 5 mol % silver iodide in at least one silver halide emulsion.
    Type: Grant
    Filed: March 29, 1996
    Date of Patent: June 9, 1998
    Assignee: Eastman Kodak Company
    Inventors: Shirleyanne Elizabeth Haye, Cheryl Ann Wilson-Bonner, Karen Ruth Ballou
  • Patent number: 5759747
    Abstract: The invention provides a method which can suitably be used to mass-produce semiconductor devices. This method includes the following steps: a) providing a silicon surface with an anti-reflective layer which is made predominantly from a mixture of polyimide and polyamidic acid, b) providing the anti-reflective layer with a photosensitive layer which is subjected to patterned radiation and then developed thus forming an etch mask of the photosensitive layer and the anti-reflective layer, c) etching the freed parts of the silicon surface, and d) removing the etch mask. The method in accordance with the invention is characterized in that, prior to applying the anti-reflective layer, the silicon surface is exposed to an oxidative treatment in which, preferably, an aqueous solution of hydrogen peroxide with ammonia or sulphuric acid is used. By virtue of this measure in accordance with the invention, the undesired etching away of small silicon structures is precluded.
    Type: Grant
    Filed: October 28, 1996
    Date of Patent: June 2, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Frank T. M. Dohmen, Gunter J. Elmendorff, Theodorus M. Lavrijsen
  • Patent number: 5756270
    Abstract: A method of processing an imagewise exposed photographic silver halide color material which comprises color development and bleach steps. Between these two steps is a fixing, stop or wash step, the solution for which is passed through an absorbent material that removes carryover color developing agent.
    Type: Grant
    Filed: September 27, 1996
    Date of Patent: May 26, 1998
    Assignee: Eastman Kodak Company
    Inventor: John Richard Fyson
  • Patent number: 5741631
    Abstract: A process for the formation of a dye image by a redox amplification process in an imagewise exposed photographic color material having at least one silver halide layer and associated therewith a dye image-forming color coupler, comprises treating the material in a color developer solution containing a color developing agent and hydroxylamine as developing agent preservative. The color developing solution is replenished directly as solids or liquid concentrates with or without additional water. The process is carried out in a tank in which the ratio of the tank volume to maximum area of material accommodatable therein is less than 11 dm.sup.3 /m.sup.2.
    Type: Grant
    Filed: January 9, 1997
    Date of Patent: April 21, 1998
    Assignee: Eastman Kodak Company
    Inventor: Peter Jeffery Twist
  • Patent number: 5738980
    Abstract: Processing of color photographic materials can be accomplished using an aqueous redox amplifier composition comprising a color developing agent, an antioxidant therefor, hydrogen peroxide, and a stabilizing amount of nitrite ions to reduce dye loss during storage.
    Type: Grant
    Filed: August 14, 1997
    Date of Patent: April 14, 1998
    Assignee: Eastman Kodak Company
    Inventors: Peter Jeffrey Twist, Christopher John Winscom
  • Patent number: 5731135
    Abstract: An aqueous redox amplifier solution having a pH in the range 10.0 to 13.5 comprises:a color developing agent and/or auxiliary developing agent, hydrogen peroxide or a compound that provides hydrogen peroxide in a concentration equivalent to 0.1 to 50.0 ml/l of 30% w/w solution, anda borate or other complexing compound capable of reversibly forming a complex with hydrogen peroxide, the complexing compound being in a concentration of from 1.0 to 100.0 g/l, andwherein the relative amounts of complexing compound and hydrogen peroxide are such as to provide an amount of hydrogen peroxide effective for redox amplification and buffer the hydrogen peroxide and thereby reduce the decline in the rate of redox amplification. This solution is useful for processing color photographic elements.
    Type: Grant
    Filed: January 30, 1997
    Date of Patent: March 24, 1998
    Assignee: Eastman Kodak Company
    Inventors: Peter Jeffery Twist, Christopher John Winscom
  • Patent number: 5707786
    Abstract: By means of a development intensification process for processing color photographic silver halide materials, the silver halide emulsions of which contain more than 90 mol. % of AgCl and less than 0.8 g of silver halide per m.sup.2 (stated as the equivalent quantity of AgNO.sub.3), short processing times accompanied by stable replenishment rates are obtained if at least one compound of the formulae (I), (II) or (III) is used as the developer substance in a quantity of 0.002 to 0.04 mol/l of developer solution ##STR1## in which R.sub.1 to R.sub.3, R.sub.10 to R.sub.17, R.sub.21 to R.sub.23, m, n and Y have the meaning stated in the specification.
    Type: Grant
    Filed: July 8, 1996
    Date of Patent: January 13, 1998
    Assignee: Agfa-Gevaert
    Inventors: Arno Schmuck, Jorg Hagemann, Norman Klaunzer
  • Patent number: 5702874
    Abstract: High silver chloride photographic materials are processed using a development stop bath containing a sulfite fixing agent, followed by bleaching, fixing and treatment with an oxidizing agent that destroys sulfite ions. No washing or stabilizing steps are used after the treatment with oxidizing agent.
    Type: Grant
    Filed: September 27, 1996
    Date of Patent: December 30, 1997
    Assignee: Eastman Kodak Company
    Inventors: John Richard Fyson, Gareth Bryn Evans
  • Patent number: 5702873
    Abstract: A redox-amplification solution comprising hydrogen peroxide, or a substance capable of releasing hydrogen peroxide, or reducing agent, such as a color developing agent, and in combination three or more sequestering agents for complexing with a transition metal ion to inhibit catalysis of impurities emanating from a photographic film coating and enhance the stability of the solution; a method of photographic color processing including a step using the redox-amplification solution and its use therefor.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: December 30, 1997
    Assignee: Eastman Kodak Company
    Inventor: Peter Jeffery Twist
  • Patent number: 5695913
    Abstract: A process for the formation of a color image which comprises the steps of: exposing to light a silver halide light-sensitive material comprising a support having thereon at least one light-sensitive emulsion layer, and developing said light-sensitive material to form a color image, wherein said light-sensitive material comprises at least one dye-forming coupler and at least one coloring reducing agent represented by formula (I) and is intensified with a solution containing hydrogen peroxide or a compound releasing hydrogen peroxide to form an intensified image:R.sup.11 --NH--NH--X--R.sup.12 (I)wherein R.sup.11 represents an aryl group or a heterocyclic group; R.sup.12 represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heterocyclic group; and X represents --SO.sub.2 --, --CO--, --COCO--, --CO--O--, --CO--N(R.sup.13)--, --COCO--O--, --COCO--N(R.sup.13)--, or --SO.sub.2 --N(R.sup.13)--, in which R.sup.
    Type: Grant
    Filed: February 28, 1996
    Date of Patent: December 9, 1997
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Koichi Nakamura, Koki Nakamura, Kiyoshi Takeuchi
  • Patent number: 5691118
    Abstract: Low silver color photographic papers are processed with separate bleaching and fixing steps wherein the bleaching solution is a peroxide solution. Prior to and after the bleaching step, and before fixing, the color papers are treated with acidic solutions to reduce blue record Dmin.
    Type: Grant
    Filed: October 10, 1996
    Date of Patent: November 25, 1997
    Assignee: Eastman Kodak Company
    Inventor: Shirleyanne E. Haye
  • Patent number: 5691122
    Abstract: Certain organic carbocyclic and heterocyclic compounds are useful catalysts for hydrogen peroxide bleaching agents in photographic processing methods. These compounds are oxidizable by hydrogen peroxide and reducible by silver metal at a pH of from 1 to 7, and have a chemically reversible redox couple of from about -0.20 to about +1.0 volts at the same pH. The hydrogen peroxide bleaching ability is enhanced by the presence of these compounds which can be used in the bleaching solution itself, or in a prebath solution. The combination of the organic compound with a transition metal ion co-catalyst provides a synergistic effect in bleaching acceleration.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: November 25, 1997
    Assignee: Eastman Kodak Company
    Inventor: Terrence Robert O'Toole
  • Patent number: 5686229
    Abstract: A photographic material is processed by fixing during or after development, followed by redox amplification while monitoring image formation and adjusting to treatment time or composition of the redox amplifying solution, to obtain desired results.
    Type: Grant
    Filed: September 13, 1996
    Date of Patent: November 11, 1997
    Assignee: Eastman Kodak Company
    Inventor: Peter J. Twist
  • Patent number: 5683858
    Abstract: A photographic bleach solution contains hydrogen peroxide, or a compound capable of releasing hydrogen peroxide, and two or more sequestering agents capable of complexing with a transition metal. The bleach solution ha a pH in the alkaline range. A method of using such a photographic bleach solution is also disclosed.
    Type: Grant
    Filed: June 19, 1996
    Date of Patent: November 4, 1997
    Assignee: Eastman Kodak Company
    Inventor: John Richard Fyson
  • Patent number: 5670300
    Abstract: A redox amplification photographic process comprises a sulfite fixing step after development-amplification and prior to peroxide bleaching.
    Type: Grant
    Filed: August 9, 1996
    Date of Patent: September 23, 1997
    Assignee: Eastman Kodak Company
    Inventors: John Richard Fyson, Gareth Bryn Evans