Accelerator Patents (Class 430/487)
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Patent number: 4440849Abstract: The invention relates to a process for the production of colored images by the dye diffusion transfer principle, in which a color photographic recording material containing negative silver halide emulsions and reducible color-providing compounds is developed with an alkaline developer preparation containing a combination of at least one compound from each of at least two of the groups of compounds (A, B, C) defined below as development accelerators. With combinations of this type, equal or higher maximum color densities are obtained for a smaller overall quantity of development accelerator.A: a 1,3-diol containing from 3 to 10 carbon atomsB: a cyclohexane dimethanol or cyclohexene dimethanolC: an aryl alkanol or aroxyalkanol containing from 7 to 12 carbon atoms.Type: GrantFiled: June 21, 1982Date of Patent: April 3, 1984Assignee: Agfa-Gevaert AktiengesellschaftInventor: Werner Krafft
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Patent number: 4414305Abstract: An image-forming method is disclosed. The method includes providing a silver halide color photographic material and imagewise exposing that material. The exposed material is color developed in the presence of a compound capable of reacting with or adsorbing a silver halide. The material is developed within a mono-bath intensifying developing solution which includes hydrogen peroxide or a compound capable of releasing hydrogen peroxide and a color developing agent. The solution substantially excludes the presence of bromide ions and iodide ions. The compound capable of reacting with or being absorbed into silver halide is a nitrogen-containing heterocyclic compound which has been found to be very useful in the image-forming method to obtain high color density with materials containing a small amount of silver halide.Type: GrantFiled: July 28, 1982Date of Patent: November 8, 1983Assignee: Fuji Photo Film Co., Ltd.Inventors: Koichi Nakamura, Hiroyuki Hirai
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Patent number: 4409324Abstract: A multilayer color photographic sensitive material is disclosed. The material is comprised of a support base and a silver halide emulsion layer. The material contains at least one layer containing a high boiling solvent and an oil-soluble coupler, wherein the volume ratio of solvent to coupler is 1/2 or less, and a compound represented by the general formula (I): ##STR1## wherein X is a hydrogen atom or an acetyl group, R is an aryl group, and R.sub.1, R.sub.2, R.sub.3 and R.sub.4, which may be the same or different, each represents a hydrogen atom, an alkyl group or an aryl group. The material produces sharp images even though it contains a low oil/coupler ratio. Furthermore, there is no retardation of development.Type: GrantFiled: September 21, 1982Date of Patent: October 11, 1983Assignee: Fuji Photo Film Co., Ltd.Inventors: Takatoshi Ishikawa, Akio Mitsui, Masakazu Morigaki, Takashi Nakamura
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Patent number: 4407935Abstract: The compounds of the formula ##STR1## in which R is amino, cyclic amino, aryloxy or a group of the formula ##STR2## in which L is a radical of the formula .dbd.N-Z, with Z being alkyl or cycloalkyl, or is a heterocyclic radical, aryleneoxy or oxyaryleneoxy and R' and R" are hydrogen, alkyl or halogen, and x and y are 0, 1, 2 or 3, are suitable development accelerators for the development of exposed photographic materials containing silver halide. They accelerate the reduction of the exposed silver salt to silver and thus enhance the sensitivity of the photographic material.Type: GrantFiled: January 15, 1982Date of Patent: October 4, 1983Assignee: Ciba-Geigy AGInventors: Mario Fryberg, David G. Leppard
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Patent number: 4385108Abstract: A method of forming negative dot images which comprises imagewise exposing through a contact screen a silver halide photographilic light-sensitive material of substantially the surface latent image type containing in a silver halide emulsion layer or another hydrophilic colloidal layer(a) a hydroquinone developing agent, and(b) a compound represented by the formula, R.sup.1 NHNHCOR.sub.2, wherein R.sup.1 is an aryl group which may be substituted, and R.sup.2 is a hydrogen atom, an alkyl group which may be substituted, or an aryl group which may be substituted, and thereafter processing the thus exposed light-sensitive material with an activator aqueous solution having a pH of 11.5 or more.Type: GrantFiled: June 23, 1980Date of Patent: May 24, 1983Assignee: Fuji Photo Film Co., Ltd.Inventors: Yoshihiro Takagi, Yoshitaka Akimura, Hiroyuki Mifune, Eiichi Okutsu
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Patent number: 4362811Abstract: A processing solution composition for treating an image receiving layer in silver complex diffusion transfer process, which contains 1.7.times.10.sup.-3 to 1.7.times.10.sup.-2 mole/liter of a bromide and 2.0 to 12.0 mole-% of potassium ion based on total cations of the salts contained in the composition accelerates the transfer speed and gives a silver image high in maximum density, contrast and sharpness to the image.Type: GrantFiled: July 10, 1981Date of Patent: December 7, 1982Assignee: Mitsubishi Paper Mills Ltd.Inventors: Shigeru Iguchi, Shozi Oka
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Patent number: 4322493Abstract: A reversal development processing method for black and white silver halide photographic light-sensitive materials which comprises bleaching an imagewise exposed black and white silver halide photographic light-sensitive material with a bleaching solution containing at least one oxidizing agent capable of forming a water-soluble silver salt when reacted with the silver images of said exposed light-sensitive material in the presence of at least one bleach accelerating agent selected from the compounds represented by the general formulae (I) to (VIII) described in the specification.Type: GrantFiled: September 26, 1979Date of Patent: March 30, 1982Assignee: Fuji Photo Film Co., Ltd.Inventors: Haruo Shibaoka, Katsumi Hayashi
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Patent number: 4298673Abstract: A lithographic type diffusion transfer developing composition which provides high contrast images having sharp toe-gradation for developing silver halide light-sensitive materials contains at least one amine represented by one of the following general formulae (I), (II) or (III):H.sub.2 N-C.sub.n H.sub.2n -X (I) ##STR1## X, X', R.sub.1, n and m are defined in the specification. The process of developing using such a composition is also disclosed.Type: GrantFiled: March 6, 1978Date of Patent: November 3, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Kikuo Kubotera, Eiichi Mizuki, Masato Satomura, Haruhiko Iwano, Tadahiro Fujiwara
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Patent number: 4292391Abstract: Pyrazolo [3,4-d] pyrimidine, and derivatives thereof, can be added to either a silver halide emulsion, or to a hydroquinone (litho) developer to accelerate development and reduce the induction period.Type: GrantFiled: February 6, 1980Date of Patent: September 29, 1981Assignee: E. I. Du Pont de Nemours and CompanyInventor: Joseph D. Overman
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Patent number: 4292400Abstract: Photographic elements containing image-wise developable silver halide are developed in the presence of an oxathioether development activator according to the formula:R.sup.1 --A--(OCH.sub.2 CH.sub.2).sub.n --S--A'--(X--A").sub.m --Y--R.sup.2wherein:R.sup.1 is H, alkyl, hydroxyalkyl, or R.sup.2 --Y--(A"--X).sub.m --A'--S--,A, A', and A" is alkylene, with the proviso that A is a monovalent bond when R.sup.1 is hydrogen or alkyl or hydroxyalkyl,X is --OCO--, --SO.sub.2 --, --CONH--, or Y,Y is ligand or complexing function of the type of --S-- and --N(Q)-- (Q=H or alkyl),R.sup.2 is alkyl, which may be substituted by OH, or when Y is --N(Q)--, R.sup.2 together with Q may represent the atoms needed to complete a nitrogen-containing saturated ring,n is at least 2, and m is 0 or 1.The development activators can be used in black-and-white development or in color development. They can be incorporated in the photographic material or in the developing solution.Type: GrantFiled: September 10, 1980Date of Patent: September 29, 1981Assignee: Agfa-Gevaert, N.V.Inventors: Robert J. Pollet, Francis J. Sels, Karel A. Brems, Maurice A. de Ramaix
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Patent number: 4287291Abstract: This invention relates to a light-sensitive color photographic material and more particularly to a diffusion transfer color photographic film unit, the processing composition of which contains a specific saturated aliphatic or saturated alicyclic alcohol.Type: GrantFiled: November 21, 1979Date of Patent: September 1, 1981Assignee: Konishiroku Photo Industry Co., Ltd.Inventor: Kaoru Onodera
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Patent number: 4282306Abstract: Diffusion transfer color processes employing dye developers have been found to give improved results by the inclusion in the processing composition of a 5- or 6-membered aromatic unsaturated diazole free of imino nitrogen atoms.Type: GrantFiled: April 24, 1980Date of Patent: August 4, 1981Assignee: Polaroid CorporationInventor: Ronald F. Lambert
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Patent number: 4273863Abstract: A process of forming color images comprises imagewise exposing a silver halide photographic color image-transfer product comprising an image dye-providing compound in the presence of a silver halide developer, and treating the exposed photographic product with an alkaline processing composition in the presence of an amino acid or a combination of an acid and an amine. Color images are achieved having excellent image discrimination (Dmax-Dmin).Type: GrantFiled: July 27, 1979Date of Patent: June 16, 1981Assignee: Eastman Kodak CompanyInventors: Jean Deabriges, Yves Ferre, Claude Goumont
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Patent number: 4267263Abstract: .beta.-Aminoethyl carbamic acid is useful in photographic baths and developer compositions in order to accelerate the development.Type: GrantFiled: December 12, 1979Date of Patent: May 12, 1981Assignee: AGFA-Gevaert, A.G.Inventors: Friedrich-Wilhelm Kunitz, Erich Wolff, Karl Frank
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Patent number: 4264717Abstract: Compounds of the formula ##STR1## are useful in photographic materials and processes for the color development.Type: GrantFiled: October 17, 1979Date of Patent: April 28, 1981Assignee: AGFA-Gevaert, A.G.Inventors: Helmut Haseler, Fritz Nittel
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Patent number: 4255512Abstract: A multicolor diffusion transfer photographic system wherein development of an exposed multilayer photsensitive element is effected in the presence of a ligand which is represented by the formula ##STR1## wherein R is hydrogen, alkyl or hydroxyalkyl, m is an integer of from 3 to 10 and n is 0 or an integer of from 1 to 3 with the proviso that the sum of m and n is not greater than 10.Type: GrantFiled: December 26, 1979Date of Patent: March 10, 1981Assignee: Polaroid CorporationInventors: George H. Nawn, Donald O. Rickter
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Patent number: 4248955Abstract: A multicolor diffusion transfer photographic system wherein development of an exposed multilayer photosensitive element is effected in the presence of an oligomer which is represented by the formulaR.sub.1 O(CH.sub.2 CH.sub.2 O).sub.m R.sub.2wherein R.sub.1 and R.sub.2 each independently may be --CH.sub.3 or --C.sub.2 H.sub.5 and m is an integer of from 4 to 10.Type: GrantFiled: December 26, 1979Date of Patent: February 3, 1981Assignee: Polaroid CorporationInventor: George H. Nawn
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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