Multiple Sensitizers Or Supersensitizing Patents (Class 430/572)
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Patent number: 4876183Abstract: A silver halide photosensitive material comprising a support having thereon at least one silver halide emulsion layer comprising tabular grains whose diameter of an average projected area/average thickness ratio is 5/1 or higher is provided. Said emulsion layer contains one or more luminescent dyes whose luminescence quantum yield is 0.3 or more when its concentration is dry gelatin is 10.sup.-4 mol/dm.sup.3 at room temperature and that can be substantially removed by development processing, and the content of said luminescent dye is 3.0 .mu.mol/m.sup.2 or more for the total surface area of the silver halide grains in said emulsion layer, or is 2.0 mmol/dm.sup.3 or more in a hydrophilic dispersion medium excluding the silver halide grain surfaces in said emulsion layer.Type: GrantFiled: December 1, 1987Date of Patent: October 24, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Tsutomu Miyasaka, Masaki Okazaki, Tadao Sugimoto
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Patent number: 4873184Abstract: Supersensitization of photothermographic silver halide emulsions is effected by the addition of a metal chelating agent to a photothermographic emulsion which is or becomes spectrally sensitized.Type: GrantFiled: February 5, 1988Date of Patent: October 10, 1989Assignee: Minnesota Mining and Manufacturing CompanyInventor: Sharon M. Simpson
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Patent number: 4863846Abstract: A silver halide photographic light-sensitive material is disclosed which is decreased in variation of light-sensitivity caused by a change in environmental humidity and a prolonged storage of the photographic material.Type: GrantFiled: June 21, 1988Date of Patent: September 5, 1989Assignee: Konica CorporationInventors: Shigeo Tanaka, Mitsuhiro Okumura, Makoto Kajiwara, Masanobu Miyoshi
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Patent number: 4837140Abstract: A color image-forming process is disclosed, which comprises imagewise exposing a silver halide color photographic material comprising a support having thereon at least one light-sensitive layer containing at least one coupler capable of forming a dye upon a reaction with an oxidation product of an aromatic primary amine color developing agent and a silver halide emulsion spectrally sensitized with a dye represented by the following general formula (I), (II) or (III), substantially excluding silver iodide, and containing about 80 mol % or more silver chloride, processing the exposed photographic material with a color developer, then processing it with a solution having a pH of not more than about 6.5 and having a bleaching ability within about 75 seconds: ##STR1## wherein the symbols have the meanings described hereinafter. A silver halide color photographic material to be processed in accordance with the method described above is also disclosed.Type: GrantFiled: June 8, 1987Date of Patent: June 6, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Tadashi Ikeda, Tadashi Ogawa
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Patent number: 4822726Abstract: A method for forming color images and silver halide color photographic material for use therewith are provided by the present invention. The method comprises imagewise exposing a silver halide color photographic material processing with a color developer and then successively processing with a solution having a bleaching ability and having a pH of about 6.5 or less for a period of time of about 75 seconds or less, wherein the silver halide color photographic material contains at least one light-sensitive layer on a support, the light-sensitive layer containing at least one coupler capable of forming a dye by the coupling reaction with the oxidation product of an aromatic primary amine color developing agent and a silver halide emulsion which substantially excludes silver iodide but contains silver chloride in an amount of about 80 mol % or more and which has been spectrally-sensitized with a dye as represented by general formula (I), (II) or (III) described herein.Type: GrantFiled: June 8, 1987Date of Patent: April 18, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Tadashi Ikeda, Tadashi Ogawa, Masaki Okazaki
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Patent number: 4820624Abstract: A corner development type silver halide photographic emulsion is disclosed, wherein the silver halide crystals in the silver halide emulsion are cubic or tetradecahedral grains having at least substantial (100) planes and the emulsion is controlled so that at least 70% of developed silver halide crystals (grains), which are observed on applying a light exposure of 1/50 second to the emulsion under the light-exposure condition corresponding to (maximum density --minimum density).times.3/4 of the silver image in the characteristic curve of the emulsion obtained by the developer, developing under the development condition which are used for processing a photographic light-sensitive material formed by coating the emulsion on a support, and stopping the development with an aqueous solution of 5% glacial acetic acid just after the initiation of the development, are developed at the corners of the cubic or tetradecahedral crystals or at the vicinity of the corners.Type: GrantFiled: December 28, 1987Date of Patent: April 11, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Kazunori Hasebe, Masahiro Asami, Naoto Ohshima, Keisuke Shiba, Toshihiro Nishikawa
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Patent number: 4820606Abstract: A silver halide photographic material having at least one silver halide emulsion layer having been spectrally sensitized with adsorbable spectral sensitizing dye is disclosed, wherein a hydrophilic dispersion medium contains a substantially non-adsorbable luminescent dye which is easily removable by development processing the satisfies the following conditions (1) to (3):(1) The luminescent dye has an equilibrium adsorption of not more than 5.times.10.sup.-7 mol per m.sup.2 of silver bromide grain surface in a 5% by weight gelatin aqueous solution containing silver bromide grains whose outer surface is composed substantially of a [111] face under conditions of 40.degree. C. in temperature, 6.5.+-.0.05 in pH, and 10.sup.-4 mol/l in dye concentration in the solution phase;(2) The luminescent dye has an emission quantium yield of not less than 0.1 at room temperature in dry gelatin at a concentration of 10.sup.-4 mol/dm.sup.Type: GrantFiled: December 1, 1987Date of Patent: April 11, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Tsutomu Miyasaka, Masaki Okazaki, Tadao Sugimoto
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Patent number: 4818676Abstract: Disclosed is a silver halide photographic emulsion supersensitized with at least two sensitizing dyes selected from those represented by the following general formula [I], [II] and [III]:General formula [I]: ##STR1## wherein R.sub.1 represents an unsubstituted or substituted alkyl group, R.sub.2 represents a sulfoalkyl group or a sulfoaralkyl group, and R.sub.3 represents an alkyl group, and W.sub.1 and W.sub.2 represent each an alkylene group;General formula [II]: ##STR2## wherein W.sub.3 to W.sub.6 represent each an alkyl group, an alkoxy group, or hydroxyl group, R.sub.4 represents an unsubstituted or substituted alkyl group, R.sub.5 represents a sulfoalkyl group or a sulfoaralkyl group, and R.sub.6 represents an alkyl group;General formula [III]: ##STR3## wherein R.sub.7 represents an unsubstituted or substituted alkyl group, R.sub.8 represents a sulfoalkyl group or a sulfoaralkyl group, R.sub.9 represents an alkyl group, and W.sub.7 and W.sub.Type: GrantFiled: September 10, 1986Date of Patent: April 4, 1989Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Susumu Baba, Eigi Matsubara, Katsuaki Iwaosa, Akira Tanaka
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Patent number: 4808516Abstract: A photographic emulsion comprising silver halide, a spectral sensitizing dye, and rhodanine.Type: GrantFiled: July 21, 1987Date of Patent: February 28, 1989Assignee: Eastman Kodak CompanyInventors: Anthony D. Gingello, Hermano P. Rocha
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Patent number: 4780404Abstract: 5-substituted-1,2,3,4-thiatriazoles have been found to be supersensitizers for silver halide photographic emulsions spectrally sensitized to the infrared.Type: GrantFiled: June 9, 1987Date of Patent: October 25, 1988Assignee: Minnesota Mining and Manufacturing CompanyInventors: Peter D. Sills, James B. Philip, Jr., Richard J. Loer, Craig Perman
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Patent number: 4777125Abstract: A silver halide emulsion for use in a radiographic element,--comprising at least one silver halide emulsion layer coated on one side or on both sides of a transparent support--, characterized by the fact that it contains silver halide cubic grains having J-band spectral sensitizing dyes adsorbed on the surface thereof in a quantity substantially higher than that amount which substantially optimally sensitizes said grains, exhibits a reduced residual stain and an improved image quality.Type: GrantFiled: May 1, 1987Date of Patent: October 11, 1988Assignee: Minnesota Mining and Manufacturing CompanyInventors: Gerolamo Delfino, Milena Debenedetti
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Patent number: 4607006Abstract: A silver halide photographic light-sensitive material is described containing at least one electron-donative, silver halide-adsorptive compound represented by the following general formula (A) or (B), which is not a spectral sensitizing agent for silver halide or a nucleating agent:D--L--X (A)D--X (B)wherein D represents an electron donative atomic group comprising an aromatic ring or hetero ring, which may be unsubstituted or substituted with at least one substituent; L represents a linkage group containing at least one of C, N, S or O; and X represents a group which is adsorptive with a silver halide-adsorptive group containing at least one of C, N, S, O or Se, said N being optionally quarternized.Type: GrantFiled: October 9, 1984Date of Patent: August 19, 1986Assignee: Fuji Photo Film Co., Ltd.Inventors: Shigeo Hirano, Yasuhisa Sano, Haruo Takei, Tsutomu Miyasaka, Shinsaku Fujita
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Patent number: 4603104Abstract: Combinations of supersensitizers for photographic emulsions have been found which provide increased speed.Type: GrantFiled: May 31, 1985Date of Patent: July 29, 1986Assignee: Minnesota Mining and Manufacturing CompanyInventor: James B. Philip, Jr.
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Patent number: 4594317Abstract: A silver halide photographic light-sensitive material comprising a support having provided thereon at least one silver halide emulsion layer in which at least 50% of the total projected surface area of the total silver halide grains comprises tabular silver halide grains having a means aspect ratio of 5:1 or more and which has been spectrally sensitized by a specific combination of sensitizing dyes. The material exhibits excellent stability on storage.Type: GrantFiled: December 14, 1984Date of Patent: June 10, 1986Assignee: Fuji Photo Film Co., Ltd.Inventors: Noboru Sasaki, Shunichi Aida, Tadashi Ikeda
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Patent number: 4582786Abstract: A silver halide photographic emulsion in which tabular silver halide grains having a diameter-to-thickness ratio of 5 or more account for 50% or more of the whole silver halide grains in terms of projected area, said silver halide emulsion containing at least one cyanine dye represented by the following general formula (I) and at least one compound represented by the following general formula (II) and/or at least one compound represented by the following general formula (III): ##STR1## wherein the substituents are as defined in the claims. The silver halide photographic emulsion is an extremely sensitive, spectrally sensitized emulsion.Type: GrantFiled: November 29, 1984Date of Patent: April 15, 1986Assignee: Fuji Photo Film Co., Ltd.Inventors: Tadashi Ikeda, Haruo Takei, Hiroshi Yamashita
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Patent number: 4578347Abstract: The addition of water-soluble triaryl compounds selected from the group consisting of phosphines, amines, arsines, bismuthines and stibylidynes provides sensitizing effects and, when added to spectrally sensitized emulsions, provides a supersensitizing effect. The activity of these compounds is additive with other supersensitizers.Type: GrantFiled: August 29, 1984Date of Patent: March 25, 1986Assignee: Minnesota Mining and Manufacturing CompanyInventor: James B. Philip, Jr.
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Patent number: 4552837Abstract: A silver halide color photographic emulsion is described, containing at least one sensitizing dye represented by formula (I) and at least one compound represented by formula (II). The use of compounds of formula (I) in combination with compounds of formula (II) permits the spectral sensitization of photographic emulsions without extending the wavelength region of spectral sensitivity, enabling the production of a light-sensitive material of high sensitivity and reduced fog. ##STR1## (The symbols V, W.sub.1, W.sub.2, R.sub.1, R.sub.2, R.sub.3, X, n, R.sub.5, Y, X.sub.1, m.sub.1 and m.sub.2 are as defined in the appended claims).Type: GrantFiled: April 11, 1984Date of Patent: November 12, 1985Assignee: Fuji Photo Film Co., Ltd.Inventors: Masaki Okazaki, Osami Tanabe, Satoshi Nagaoka, Yuji Mihara, Toshinao Ukai
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Patent number: 4544628Abstract: A silver halide photographic emulsion is disclosed which includes a sensitizing dye represented by general formula (I) and a compound represented by general formula (II): ##STR1## The substituents within the general formulae are defined within the specification. The emulsion can be used to prepare a photographic material which has high green-sensitivity which is obtained without expanding the wavelength region of spectral sensitivity in the green sensitive region. Further, the resulting material has these improved results and does not show substantial change of its photographic properties such as sensitivity and amount of fogging during storage.Type: GrantFiled: February 2, 1984Date of Patent: October 1, 1985Assignee: Fuji Photo Film Co., Ltd.Inventors: Yuji Mihara, Satoshi Nagaoka, Masaki Okazaki
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Patent number: 4513081Abstract: A silver halide photographic emulsion is described containing in combination at least one sensitizing dye represented by formula (I) and at least one cyan coupler represented by formula (II): ##STR1## wherein all the symbols are defined in the specification. In a preferred embodiment, in addition to the sensitizing dye (I) and the cyan coupler (II), there may also be included at least one compound represented by formula (III) ##STR2## wherein all the symbols are also defined in the specification.Type: GrantFiled: May 21, 1984Date of Patent: April 23, 1985Assignee: Fuji Photo Film Co., Ltd.Inventors: Masaki Okazaki, Osami Tanabe, Satoshi Nagaoka, Yuji Mihara, Keizo Kimura, Makoto Umemoto
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Patent number: 4493889Abstract: A silver halide photographic light-sensitive material is disclosed. The material is comprised of a support having thereon a red-sensitive silver halide photographic emulsion layer comprising a tetramethine melocyanine dye represented by the general formula (I) and a compound represented by the general formula (II) ##STR1## the substituents within these structural formulae are defined within the specification. The material gives improved results with respect to preventing diffuse sensitization. The material also provides a red-sensitive silver halide photographic emulsion in which a decline of spectro-sensitivity in the lapse of dissolution is relatively small and which has a small amount of dye fog.Type: GrantFiled: January 23, 1984Date of Patent: January 15, 1985Assignee: Fuji Photo Film Co., Ltd.Inventors: Yuji Mihara, Satoshi Nagaoka, Masaki Okazaki
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Patent number: 4469785Abstract: There is disclosed a light-sensitive silver halide color photographic material having a silver halide emulsion layer containing at least one layer of a negative working silver halide on a support, comprising the negative working silver halide comprises at least 80 mole % of silver chloride, and being color sensitized with at least one kind of sensitizing dyes having the local maximum value of spectral sensitivity in the wavelength region from 445 nm to 490 nm and at least one kind of sensitizing dyes having the local maximum value of spectral sensitivity in the wavelength region from 420 nm to less than 445 nm.The photographic material according to this invention exhibits excellent color reproducibility and quick process suitability.Type: GrantFiled: December 10, 1982Date of Patent: September 4, 1984Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Shigeo Tanaka, Kaoru Onodera, Noboru Fujimori
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Patent number: 4442201Abstract: A method for producing a silver halide photographic light-sensitive material having on a support thereof at least one layer formed of an emulsion containing light-sensitive silver halide particles sensitized by a sensitizing dye comprising the steps of adding a first sensitizing dye to an emulsion containing silver halide particles, during the chemical ripening of the silver halide particles, to sensitize the silver halide particles; adding a second sensitizing dye to the emulsion containing the sensitized silver halide particles, after the chemical ripening of the silver halide particles, to form a coating liquid; and coating a support with the coating liquid to produce a silver halide photographic light-sensitive material.Type: GrantFiled: July 7, 1982Date of Patent: April 10, 1984Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Syun Takada, Takashi Kadowaki, Mitsuhiro Okumura, Shinichi Nakamura, Masaru Iwagaki
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Patent number: 4362806Abstract: Photographic elements, multicolor filters and receivers are disclosed having supports providing microvessels for materials such as radiation-sensitive materials, imaging materials, mordants, silver precipitating agents and materials which are useful in conjunction with these materials. Processes of forming microvessels and introducing materials therein are also disclosed. Processes of forming images are disclosed employing microvessel containing elements. Image transfer processes are disclosed for producing one or a combination of silver and multicolor subtractive primary images alone or in combination with multicolor additive primary images.Type: GrantFiled: September 8, 1980Date of Patent: December 7, 1982Assignee: Eastman Kodak CompanyInventor: Keith E. Whitmore
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Patent number: 4307183Abstract: Object of the invention are photographic emulsions including silver halide grains dispersed in gelatin and at least a methine dye spectral sensitizer associated with said grains, including in association therewith a supersensitizing or stabilizing amount of a polymeric compound having an aminoallylidenmalononitrile moiety. The invention further relates to photographic elements, in particular radiographic elements, comprising said emulsions. According to the invention, said polymeric compound is obtained upon copolymerization of an allyl monomer, comprising said aminoallylidenmalononitrile moiety, with an ethylenically unsaturated monomer.Type: GrantFiled: October 14, 1980Date of Patent: December 22, 1981Assignee: Minnesota Mining and Manufacturing CompanyInventor: Gerolamo Delfino
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Patent number: 4286044Abstract: A lith-type silver halide photographic material having high sensitivity and providing good dot quality images comprising a support having coated thereon a silver halide emulsion containing a sensitizing dye of dimethine merocyanine type represented by formula (I) and a sensitizing dye represented by formula (II): ##STR1## wherein R.sub.1 represents a sulfoalkyl group, a carboxyalkyl group, a sulfoaralkyl group, or a carboxyaralkyl group; the alkyl moiety of each alkyl group contains up to 4 carbon atoms; R.sub.2 represents a substituted or unsubstituted alkyl group or an aryl group; R.sub.3 represents --(CH.sub.2).sub.n.sbsb.1 CONH(CH.sub.2).sub.m.sbsb.1 OH or --(CH.sub.2).sub.n.sbsb.2 O(CH.sub.2).sub.m.sbsb.2 OH (wherein m.sub.1, m.sub.2, n.sub.1, and n.sub.2 each is 1 to 7; m.sub.1 +n.sub.1 and m.sub.2 +n.sub.Type: GrantFiled: August 8, 1980Date of Patent: August 25, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Yuji Mihara, Haruo Takei, Noriyuki Inoue, Tadashi Ikeda, Kenichi Kuwabara
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Patent number: 4221864Abstract: Light-sensitive silver halide photographic materials which comprise a support, a hydrophilic colloidal layer coated thereon which contains a silver halide emulsion layer and tetrazolium compounds, said silver halide emulsion layer containing a combination of two types of specific sensitizing dyes.Type: GrantFiled: April 30, 1979Date of Patent: September 9, 1980Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Tateshi Iytaka, Syunji Matsuo, Toshio Nagatani, Kazuo Takahashi, Takeshi Habu
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Patent number: 4212672Abstract: A lithographic photosensitive material, suitable for exposure with light from a neon-helium laser, comprising a support having thereon a silver halide emulsion layer containing at least one sensitizing dye represented by the following general formula (I): ##STR1## wherein Z and Z.sub.1, which may be the same or different, each represents the non-metal atoms necessary for completing a 5-membered or 6-membered nitrogen-containing heterocyclic nucleus; R and R.sub.1, which may be the same or different, each represents an alkyl group or an aryl group; Q and Q.sub.1 together represent the non-metal atoms necessary for completing a 4-thiazolidinone, 5-thiazolidinone, or 4-imidazolidinone nucleus; L, L.sub.1 and L.sub.2 each represents a methine group; n.sub.1 and n.sub.Type: GrantFiled: July 12, 1978Date of Patent: July 15, 1980Assignee: Fuji Photo Film Co., Ltd.Inventors: Yuji Mihara, Haruo Takei, Noriyuki Inoue
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Patent number: H583Abstract: A silver halide color photographic material having, on a support, at least one light-sensitive emulsion layer containing a silver chlorobromide emulsion (having a chloride content of 80 mol % or less) substantially free of iodide, with the silver chlorobromide emulsion being spectrally sensitized with a combination of at least two kinds of spectral sensitizing dyes having specified formulae, and with the silver chlorobromide emulsion layer being hardened with at least one 1,3,5-triazine derivative having specified formula, whereby achieving inhibition for increase in fog upon long-range preservation thereof as finished goods without attended by decrease in developing speed.Type: GrantFiled: January 5, 1987Date of Patent: February 7, 1989Inventor: Masahiro Asami