Develop-fix Patents (Class 430/419)
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Patent number: 9619871Abstract: An image processing unit 36 includes a frequency analysis unit 40, an optical characteristic acquisition unit 42, and a filter acquisition unit 44. The frequency analysis unit 40 acquires data in the frequency domain of each of first image data and second image data which are acquired by capturing an object image using a first optical system and a second optical system, respectively. The optical characteristic acquisition unit 42 compares the data in the frequency domain of the first image data with the data in the frequency domain of the second image data to acquire frequency characteristic data related to optical characteristics of the second optical system. The filter acquisition unit 44 acquires a sharpening filter associated with the second optical system from a plurality of sharpening filters associated with the first optical system.Type: GrantFiled: October 7, 2016Date of Patent: April 11, 2017Assignee: FUJIFILM CorporationInventors: Masahiko Sugimoto, Kenkichi Hayashi, Yousuke Naruse, Kosuke Irie
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Patent number: 6878510Abstract: A method of processing, with a developer in which a solution physical development arises, a silver halide photosensitive material containing a compound capable of undergoing a one-electron oxidation to thereby form a one-electron oxidation product thereof which belongs to the following types 1 to 4: Type 1: the one-electron oxidation product being capable of releasing further two or more electrons accompanying a subsequent bond cleavage reaction; Type 2: the one-electron oxidation product being capable of releasing further one electron accompanying a subsequent bond cleavage reaction, and the compound having, in its molecule, two or more groups adsorptive to silver halide; Type 3: the one-electron oxidation product being capable of releasing further one or more electrons after going through a subsequent bond forming reaction; and Type 4: the one-electron oxidation product being capable of releasing further one or more electrons after going through a subsequent intramolecular ring cleavage reaction.Type: GrantFiled: September 10, 2003Date of Patent: April 12, 2005Assignee: Fuji Photo Film Co., Ltd.Inventors: Kimiyasu Morimura, Kohzaburoh Yamada
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Patent number: 6726382Abstract: A bundle for photographic processing chemicals containing the concentrates for all the processing steps for processing a photographic material, wherein the concentrations of chemicals in the individual concentrates are selected such that all the concentrates are prepared with the same quantity of water in each case and the resultant replenishing liquids for all the processing steps are sufficient for the same quantity of photographic material, makes it possible largely to avoid operating errors and provides simple monitoring of the replenishment rate of the individual baths.Type: GrantFiled: December 18, 2002Date of Patent: April 27, 2004Assignee: AGFA-GevaertInventors: Peter Buttner, Marc Reiners
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Publication number: 20030194661Abstract: This relates to a method of rendering a used photographic processing solution less corrosive to low carbon steel comprising:Type: ApplicationFiled: May 12, 2003Publication date: October 16, 2003Inventors: Eric R. Schmittou, Cynthia A. Salsedo
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Patent number: 6207360Abstract: A method and an apparatus for forming an image through either basic development processing or non-basic development processing on the same processor to provide equal image quality, in which an exposed color light-sensitive material (e.g., color negative film) is processed under non-basic conditions (e.g., rapid processing conditions), image information is read out from the developed film and converted to optical or electrical digital information, the digital information is subjected to image processing to obtain target image characteristics which should have been obtained under basic development processing conditions, and the resulting image characteristics are output to a printer.Type: GrantFiled: May 12, 1998Date of Patent: March 27, 2001Assignee: Fuji Photo Film Co., Ltd.Inventors: Takatoshi Ishikawa, Hideaki Nomura
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Patent number: 6074806Abstract: Low silver black-and-white photographic silver halide elements, such as radiographic films, can be processed quickly using a developing/fixing monobath composition that includes an ascorbic acid developing agent, sulfite ions and a photographic fixing agent that has both a thiol group and an amino group (such as cysteine).Type: GrantFiled: October 26, 1999Date of Patent: June 13, 2000Assignee: Eastman Kodak CompanyInventors: Alan S. Fitterman, Robert E. Dickerson
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Patent number: 6040121Abstract: Low silver black-and-white photographic elements, such as radiographic films, can be processed quickly using a two-stage process in which black-and-white development is carried out in the first stage for up to 30 seconds, and such development continues along with fixing in the second stage for up to 60 seconds when a fixing composition is added. Both stages are carried out in the same processing container.Type: GrantFiled: May 18, 1999Date of Patent: March 21, 2000Assignee: Eastman Kodak CompanyInventors: Alan S. Fitterman, Robert E. Dickerson
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Patent number: 6033835Abstract: Low silver black-and-white photographic silver halide elements, such as radiographic films, can be processed quickly using a developing/fixing monobath composition that includes an ascorbic acid developing agent, sulfite ions and a photographic fixing agent that has both a thiol group and an amino group (such as cysteine).Type: GrantFiled: May 18, 1999Date of Patent: March 7, 2000Assignee: Eastman Kodak CompanyInventors: Alan S. Fitterman, Robert E. Dickerson
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Patent number: 6015653Abstract: A method for processing a transparent silver halide color photographic material is disclosed. The transparent silver halide photographic light-sensitive material is treated with a processing solution containing a compound represented by Formula (I).Formula I ##STR1## wherein Q is a group of atoms necessary for forming a nitrogen-containing heterocyclic ring (including one condensed with a 5- or 6-member unsaturated ring), R.sub.11 is a hydrogen atom, an alkali metal atom, ##STR2## or an alkyl group, Q' is a synonym for Q.sub.1. After the treating, a ratio (E/G) of a light absorbance E of unexposed area of the light-sensitive material at 650 nm to an amount of silver G mg/m.sup.2 remaining in the light-sensitive material is within the range of from 3.0.times.10.sup.-4 to 1.5.times.10.sup.-3 in the silver halide photogrpahic light-sensitive material,A transparent silver halide color photographic material is also disclosed.Type: GrantFiled: April 26, 1999Date of Patent: January 18, 2000Assignee: Konica CorporationInventors: Manabu Nakahanada, Wataru Satake
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Patent number: 5998109Abstract: A method for developing a silver halide photographic light-sensitive material, wherein a silver halide photographic light-sensitive material containing at least three mosaic-like or stripe-like filter layers having different spectral transmission characteristics and at least one silver halide emulsion layer is exposed, thereafter said silver halide photographic light-sensitive material is processed by coating a processing solution or spraying a processing solution which consists of a developer containing at least one developing agent.Type: GrantFiled: December 21, 1998Date of Patent: December 7, 1999Assignee: Konica CorporationInventor: Shigeto Hirabayashi
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Patent number: 5972578Abstract: Black-and-white elements, such as radiographic films, can be processed in roomlight using a developing/fixing monobath composition that also includes a water-soluble colorant, such as a water-soluble "yellow" dye, that provides safelight conditions in the processing composition. The processing method is carried out quickly, that is within 120 seconds. The colorant has a maximum absorption wavelength of from about 350 to about 500 nm, and is transparent in solution.Type: GrantFiled: May 18, 1998Date of Patent: October 26, 1999Assignee: Eastman Kodak CompanyInventors: Alan S. Fitterman, Robert E. Dickerson, Franklin C. Brayer
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Patent number: 5972581Abstract: Black-and-white elements, such as radiographic films, can be processed in roomlight using a developing/fixing monobath composition that also includes a particulate opacifying agent, such as carbon black, that provides safelight conditions in the processing composition. The processing method is carried out quickly, that is within 120 seconds.Type: GrantFiled: December 4, 1998Date of Patent: October 26, 1999Assignee: Eastman Kodak CompanyInventors: Robert E. Dickerson, Alan S. Fitterman
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Patent number: 5955247Abstract: A method for processing a black-and-white silver halide photographic light-sensitive material by a monobath processing method.Type: GrantFiled: July 7, 1998Date of Patent: September 21, 1999Assignee: Konica CorporationInventor: Shinji Uchihiro
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Patent number: 5942378Abstract: Black-and-white elements, such as radiographic films, can be processed in roomlight because the developing composition includes a water-soluble colorant. Such colorants are water-soluble dyes that have a maximum absorption wavelength of from about 350 to about 500 nm. Processing is carried out by processing the exposed element using a two-stage process in the same processing container. In the first stage, development is initiated with an opaque developing composition having a pH of from about 10 to about 12.5, and comprising an appropriate black-and-white developing agent, a yellow colorant, and a sulfite. After an appropriate time, a fixing agent (other than a sulfite) is introduced into the processing container to begin simultaneous development and fixing. The entire process in quite rapid, that is less than 90 seconds.Type: GrantFiled: May 18, 1998Date of Patent: August 24, 1999Assignee: Eastman Kodak CompanyInventors: Alan S. Fitterman, Robert E. Dickerson, Franklin C. Brayer
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Patent number: 5935770Abstract: Black-and-white elements, such as radiographic films, can be processed in roomlight because they include certain light absorbing dyes and desensitizers. Processing is carried out by processing the exposed element using a two-stage process in the same light-tight processing container. In the first stage, development is initiated with a developing composition having a pH of from about 10 to about 12.5, and comprising an appropriate black-and-white developing agent in a concentration of from about 0.1 to about 0.5 mol/l, and a sulfite at from about 0.25 to about 0.7 mol/l. After an appropriate time, a fixing agent (other than a sulfite) is introduced into the processing container to provide a combined developing/fixing compositions, and development and fixing are carried out simultaneously. The processing method is carried out quickly, usually within about 90 seconds, including a washing step at the end. The presence of sulfite and high pH in both stages decolorize or deactivate the particulate dyes.Type: GrantFiled: September 1, 1998Date of Patent: August 10, 1999Assignee: Eastman Kodak CompanyInventors: Alan S. Fitterman, Jeffrey S. Baugher, Robert E. Dickerson
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Patent number: 5912107Abstract: Black-and-white elements, such as radiographic films, can be processed in roomlight using a developing/fixing monobath composition that also includes a particulate opacifying agent, such as carbon black, that provides safelight conditions in the processing composition. The processing method is carried out quickly, that is within 120 seconds.Type: GrantFiled: March 23, 1998Date of Patent: June 15, 1999Assignee: Eastman Kodak CompanyInventors: Robert E. Dickerson, Alan S. Fitterman
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Patent number: 5908737Abstract: Black-and-white elements, such as radiographic films, can be processed in roomlight because the developing composition includes a particulate opacifying agent, such as carbon black. Processing is carried out by processing the exposed element using a two-stage process in the same processing container. In the first stage, development is initiated with an opaque developing composition having a pH of from about 10 to about 12.5, and comprising an appropriate black-and-white developing agent in a concentration of from about 0.1 to about 0.5 mol/l, opacifying agent, and a sulfite at from about 0.1 to about 0.7 mol/l. After an appropriate time, a fixing agent (other than a sulfite) is introduced into the processing container to begin simultaneous development and fixing. The entire process in quite rapid, that is less than 90 seconds.Type: GrantFiled: March 23, 1998Date of Patent: June 1, 1999Assignee: Eastman Kodak CompanyInventors: Alan S. Fitterman, Robert E. Dickerson
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Patent number: 5895743Abstract: A method is disclosed of processing in a processor an image-wise exposed black-and-white light-sensitive silver halide photographic material comprising the steps of developing in a developing solution and fixing in a fixer solution, characterized in that upon starting of the processing the said fixer solution comprises a mixture of a fixer starter solution and a fixer replenisher solution, in that said fixer solution is replenished with the said fixer replenishing solution and in that the said fixer starter solution is a developing solution.Type: GrantFiled: December 12, 1997Date of Patent: April 20, 1999Assignee: AGFA-Gevaert, N.V.Inventors: Andre Roefs, Benedictus Jansen, Frank Michiels
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Patent number: 5871890Abstract: Black-and-white elements, such as radiographic films, can be processed in roomlight because they include certain light absorbing dyes and desensitizers. Processing is carried out by processing the exposed element using a two-stage process in the same light-tight processing container. In the first stage, development is initiated with a developing composition having a pH of from about 10 to about 12.5, and comprising an appropriate black-and-white developing agent in a concentration of from about 0.1 to about 0.5 mol/l, and a sulfite at from about 0.25 to about 0.7 mol/l. After an appropriate time, a fixing agent (other than a sulfite) is introduced into the processing container to provide a combined developing/fixing compositions, and development and fixing are carried out simultaneously. The processing method is carried out quickly, usually within about 90 seconds, including a washing step at the end. The presence of sulfite and high pH in both stages decolorize or deactivate the particulate dyes.Type: GrantFiled: November 14, 1997Date of Patent: February 16, 1999Assignee: Eastman Kodak CompanyInventors: Alan S. Fitterman, Jeffrey S. Baugher, Robert E. Dickerson
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Patent number: 5814435Abstract: There is disclosed a photographic composition having fixing capacity and a method for processing a silver halide photographic material using the same. The photographic composition having fixing capacity comprises at least one compound represented by the following formula (I):RSO.sub.2 M formula (I)wherein R represents a lower alkyl group having 1 to 3 carbon atoms, and M represents a hydrogen atom or a cationic group.Type: GrantFiled: August 5, 1996Date of Patent: September 29, 1998Assignee: Fuji Photo Film Co., Ltd.Inventors: Tetsuro Kojima, Masaru Yoshikawa, Yoshihiro Fujita
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Patent number: 5686229Abstract: 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: GrantFiled: September 13, 1996Date of Patent: November 11, 1997Assignee: Eastman Kodak CompanyInventor: Peter J. Twist
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Patent number: 5254452Abstract: A light-sensitive silver halide photographic material for x-ray exposure including a transparent support and a silver halide emulsion layer provided thereon. The photographic material exhibits a blue-light density in the unexposed portion of the developed image which does not exceed 0.09 and the red-light density is 0.02 to 0.10 and is less than the blue-light density.Type: GrantFiled: October 9, 1991Date of Patent: October 19, 1993Assignee: Konica CorporationInventor: Haruhiko Sakuma
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Patent number: 5244778Abstract: An acid photographic fixing agent adapted for colour photography utilizing silver coating rates of up to 2.1 mg/dm.sup.2 whereby stabilized thiosulfate fixer solution has a concentration of less than 10 gpl of ammonium thiosulphate or its chemical equivalent, comprising a solution of an alkali metal thiosulphate or an ammonium thiosulphate or a mixture thereof stabilized by a soluble sulphite or bisulphite; characterized in that the ratio by weight of the soluble sulphite to the thiosulphate is greater than 1.2:1 or greater than 1.44:1 if the bisulphite is used; thereby to preferentially maintain the thiosulfate in use.Type: GrantFiled: July 16, 1992Date of Patent: September 14, 1993Assignee: Eastman Kodak CompanyInventor: John R. Fyson
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Patent number: 5238793Abstract: A method of processing a photographic element having a layer comprising a silver halide emulsion sensitized with a cyanine dye where the dye is present in the processing solution at a concentration sufficient to cause formation of solid dye particles. The method comprises contacting the element with at least one processing solution in the presence of an effective amount of a dye solubilizing compound of the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are each independently selected from the group consisting of ##STR2## halogen, hydrogen, hydroxy, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, substituted or unsubstituted alkoxy, and sulfo,R.sub.5 and R.sub.6 are each independently selected from the group consisting of hydrogen, substituted or unsubstituted alkyl, and substituted or unsubstituted aryl, with the proviso that the dye solubilizing compound comprises at least four solubilizing groups as substituents on R.sub.5 's or R.sub.Type: GrantFiled: May 8, 1989Date of Patent: August 24, 1993Assignee: Eastman Kodak CompanyInventor: Harry A. Hoyen, Jr.
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Patent number: 5217853Abstract: A method for development processing of a silver halide photosensitive material using an automatic processor including at least the functions of development, fixing, washing and drying is disclosed, comprising using an alkaline developer containing a dialdehyde film hardening agent and carrying out the processing under conditions such that the running equilibrium pH of the fixer is at least 4.6.Type: GrantFiled: August 3, 1992Date of Patent: June 8, 1993Assignee: Fuji Photo Film Co., Ltd.Inventors: Minoru Yamada, Takashi Toyoda
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Patent number: 5198327Abstract: For formation of a photographic image by development of a silver halide photographic material with an automatic developing machine, a certain period of time or not longer than 15 seconds is set as the time of the development step and a silver halide photographic material is used which, when developed for a period of one-half of said certain period of time after such an exposure that the exposed silver halide photographic material, when developed for said certain period of time, would give a value of (Dmax-fog).times.1/2, gives a value of (D-fog) having 70% or more of the value of (Dmax-fog).times.1/2. The silver halide photographic material comprises at least one of a combination of (1), (2) and (3) or (2) and (4): where: (1) represents a silver halide emulsion containing a water-soluble iridium salt; (2) represents a silver halide emulsion layer with a silver amount from 1 to 3.5 grams/m.sup.2 coated on one surface of said emulsion layer; (3) represents silver halide grains wherein the mean grain size is 1.Type: GrantFiled: December 23, 1991Date of Patent: March 30, 1993Assignee: Fuji Photo Film Co., Ltd.Inventors: Minoru Yamada, Naoki Arai, Kazuo Kagawa
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Patent number: 5187050Abstract: A method for processing a silver halide photographic material is described, comprising the steps of:(a) developing a silver halide photographic material comprising a support having thereon at least one hydrophilic colloidal layer, including at least one light-sensitive emulsion layer containing tabular silver halide grains having an aspect ratio of at least about 4, the total number of hydrophilic colloidal layers having a degree of swelling of about 250% or less; and(b) after developing a predetermined amount of said silver halide photographic material, adding a single replenisher of the developer comprising a 3-pyrazolidone developing agent represented by formula (I): ##STR1## wherein R.sub.o represents a substituted or unsubstituted aryl group; and R.sub.1, R.sub.2, R.sub.3 and R.sub.Type: GrantFiled: February 4, 1992Date of Patent: February 16, 1993Assignee: Fuji Photo Film Co., Ltd.Inventors: Minoru Yamada, Takashi Toyoda, Sumito Yamada
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Patent number: 5178994Abstract: Photographic silver halide photosensitive material is continuously processed through an automatic processor by passing the photosensitive material through a developing tank filled with a developer and then through a fixing tank filled with a fixer while supplying developer and fixer replenishers to the developing and fixing tanks in amounts corresponding to the processing quantity. The replenisher amount can be reduced by adding a chelating agent to the developer and its replenisher. Kits containing developer and fixer replenisher concentrates become empty at the same timing if the ratio of the volumes of developer and fixer replenishers prepared from their kits by diluting developer and fixer concentrates in the kits with water is substantially equal to the ratio of the amounts of developer and fixer replenishers supplied to the tanks.Type: GrantFiled: June 21, 1991Date of Patent: January 12, 1993Assignee: Fuji Photo Film Co., Ltd.Inventor: Minoru Yamada
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Patent number: 5063143Abstract: A process for forming a color image wherein a color photographic material is developed with a processing solution containing a solvent for the silver halide in the presence of an aromatic primary amino color devloping agent. The color photographic material comprises, on a support, at least one layer containing (1) a coupler capable of forming a dye by reaction with an oxidized aromatic primary amino color developing agent and having a dye covering power of at least 0.75 and (2) a silver chlorobromide emulsion or silver chlorobromide emulsion containing at least 90 molar % of silver chloride.Type: GrantFiled: April 9, 1990Date of Patent: November 5, 1991Assignee: Fuji Photo Film Co., Ltd.Inventors: Takeshi Hirose, Akira Abe, Kiyoshi Nakazyo
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Patent number: 4868098Abstract: The processing of exposed silver dye bleach materials by applying, to the uppermost layer of the material, an amount of processing liquid which corresponds to not more than the swelling volume of the material, followed by a heat treatment.The process is particularly suitable for the production of positive colored images, especially in automatic copying or photographing machines.Type: GrantFiled: January 5, 1988Date of Patent: September 19, 1989Assignee: Ciba-Geigy AGInventors: Rolf Steiger, Urs J. Furholz
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Patent number: 4826745Abstract: Method of preparing a hologram which is of the silver halide in gelatin binder type, which method comprises exposing, developing and bleaching the holographic material, where a water-soluble halide and a ferric salt of an acetic acid derivative are used in the bleach bath.Type: GrantFiled: December 15, 1987Date of Patent: May 2, 1989Assignee: Ciba-Geigy AGInventors: Trevor Groves, David W. Butcher
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Patent number: 4748097Abstract: A method of preparing a hologram which comprises subjecting holographic material to a holographic exposure, the holographic material comprising silver halide emulsion of which at least 80% by weight of the halide is bromide, developing the exposed material in a silver halide developing solution to yield developed silver, converting the developed silver to silver chloride using a bleaching agent selected from ferric ions, persulphate ions, chlorate ions, peroxides and water-soluble quinones, in the presence of chloride ions and then fixing out the silver chloride using a silver halide fixing agent which dissolves silver chloride but not silver bromide or silver iodobromide under the conditions of use.Type: GrantFiled: June 24, 1986Date of Patent: May 31, 1988Assignee: Ciba-Geigy AGInventors: John A. Clark, Alan Adshead, David W. Butcher
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Patent number: 4530898Abstract: Photographic film units and processes are disclosed which provide a negative image, wherein exposed silver is developed to high covering power silver and unexposed silver halide is reduced to low covering power silver.Type: GrantFiled: February 29, 1984Date of Patent: July 23, 1985Assignee: Polaroid CorporationInventor: Arnold Spiegal
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Patent number: 4435500Abstract: A method of rapidly processing a silver halide photographic light-sensitive material having high sensitivity and high covering power using a developing solution is disclosed. The developing solution contains a combination of a silver halide solvent and a particular anti-foggant. The rapid processing is not attended by increase in fog and deterioration of graininess. The photographic material contains a surface latent image type silver halide emulsion and a silver halide emulsion having fogged nuclei inside the grains in a single layer formed by coating the mixture thereof, or in a double layer formed by coating them separately. The anti-foggant has the general formula (I) or (II): ##STR1## wherein R.sub.1 represents hydrogen, a nitro group, a cyano group or a halogen atom; and R.sub.2 represents hydrogen, a halogen atom or an alkyl group.Type: GrantFiled: August 31, 1982Date of Patent: March 6, 1984Assignee: Fuji Photo Film Co., Ltd.Inventors: Eiichi Okutsu, Nobuyuki Iwasaki, Shunji Takada
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Patent number: 4404390Abstract: Mesoionic 1,2,4-triazolium-3-thiolate silver halide stabilizer precursors are novel compounds useful in a heat developable and heat stabilizable photographic silver halide materials and processes. After imagewise exposure of the photographic material, a developed and stabilized silver image is produced by heating the element. Mesoionic stabilizer precursors are also useful in photographic silver halide processing compositions.Type: GrantFiled: November 9, 1981Date of Patent: September 13, 1983Assignee: Eastman Kodak CompanyInventors: Henry W. Altland, Daniel D. Shiao
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Patent number: 4365085Abstract: The present invention relates to novel bicyclic compounds useful as photographic silver halide developing agents, to the preparation of these compounds and to photographic products, processes and compositions employing the same. The subject compounds may be represented by the formula ##STR1## wherein R.sub.1 and R.sub.2, the same or different, each represents hydrogen, a hydrocarbon moiety, preferably an alkyl group, --COOH or --COOR.sup.1 wherein R.sup.1 is an alkyl group; R.sub.3 and R.sub.4, the same or different, each represent hydrogen or an alkyl group, R.sub.5 represents hydrogen or --COR.sup.2 wherein R.sup.2 is an alkyl group; R.sub.6 represents hydrogen when R.sub.5 is hydrogen and represents hydrogen or --OCOR.sup.3 wherein R.sup.3 is an alkyl group the same as R.sup.2 when R.sub.5 represents --COR.sup.2 ; X represents --OH, --NH.sub.2 or --NHCOR.sup.4 wherein R.sup.4 represents an alkyl group the same as R.sup.2 ; Y represents --OH or --OCOR.sup.5 wherein R.sup.Type: GrantFiled: February 5, 1979Date of Patent: December 21, 1982Assignee: Polaroid CorporationInventors: James R. Bartels-Keith, Eva R. Karger
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Patent number: 4351896Abstract: Mesoionic 1,2,4-triazolium-3-thiolate silver halide stabilizer precursors are novel compounds useful in a heat developable and heat stabilizable photographic silver halide materials and processes. After imagewise exposure of the photographic material, a developed and stabilized silver image is produced by heating the element. Mesoionic stabilizer precursors are also useful in photographic silver halide processing compositions.Type: GrantFiled: November 9, 1981Date of Patent: September 28, 1982Assignee: Eastman Kodak CompanyInventors: Henry W. Altland, Daniel D. Shiao
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Patent number: 4324853Abstract: A processing composition adapted for use in a silver diffusion transfer process which includes a saturated polyol containing at least 3 hydroxyl groups wherein each hydroxyl group is no more than 3 carbon atoms away from another hydroxyl group.Type: GrantFiled: July 18, 1979Date of Patent: April 13, 1982Assignee: Polaroid CorporationInventor: Michael Berger
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Patent number: 4254215Abstract: A process is described for the prevention of darkening and the formation of a sediment in photographic developer solutions which contain a silver halide developer, a water-soluble silver halide solvent and organic sulfur compounds. The organic sulfur compounds are a combination of (a) an organic thiol compound or thione compound capable of tautomerism and (b) a Bunte salt which contains groups conferring solubility in water. Developer solutions which contain the indicated combination of sulfur compounds are outstandingly stable.Type: GrantFiled: March 26, 1979Date of Patent: March 3, 1981Assignee: Ciba-Geigy AGInventors: Ekkehard Kramp, John Lenoir, Max Marthaler
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Patent number: 4217405Abstract: Volume dielectric holograms are prepared by methods which have in common the intra-emulsion diffusion transfer of silver atoms within the emulsion by a process of dissolving undeveloped silver halide, and diffusing and precipitating said dissolved silver on precipitation sites provided by the development of the exposed silver halide. The resulting metallic silver is then rehalogenated to substantially reconstitute the original silver halide volume of the emulsion.Type: GrantFiled: October 14, 1975Date of Patent: August 12, 1980Assignee: Polaroid CorporationInventor: Stephen A. Benton
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Patent number: 4211559Abstract: Difunctional compounds wherein one of said functions is a hard or soft atom that ionizes to the corresponding anion in alkaline solution to combine with silver cation and the other of said functions is a non-ionizable soft base that additionally combines with said silver cation are employed as silver halide complexing agents in photography. In a preferred embodiment, the difunctional compounds possess (a) an O, N or C atom that ionizes to the corresponding O.crclbar., N.crclbar. or C.crclbar. anion in basic solution and (b) an --S-- containing moiety excluding --SH and moieties that form --S.crclbar. in basic solution wherein the --S-- of said moiety is positioned alpha, beta, gamma, delta, epsilon or zeta to said anion.Type: GrantFiled: August 4, 1978Date of Patent: July 8, 1980Assignee: Texas Instruments IncorporatedInventor: Richard B. Greenwald
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Patent number: 4210714Abstract: Process for the preparation of silver images by imagewise exposure of a photographic material comprising at least one light-sensitive silver halide emulsion layer and treatment of the material with a developer composition, wherein the improvement comprises the development is carried out in the presence of 3-mercapto-5-(2-furyl)-1,2,4-triazole. The 3-mercapto-5-(2-furyl)-1,2,4-triazole decreases the fog during development, and when this is the first development in a black-and-white or color reversal process, increases the reversal silver or color density.Type: GrantFiled: March 15, 1978Date of Patent: July 1, 1980Assignee: AGFA-Gevaert, A.G.Inventors: Heinrich Odenwalder, Anita von Konig, Franz Moll, Walter Patzold, Lothar Rosenhahn, Friedhelm Sommer