Patents by Inventor Yoshikazu Takaya
Yoshikazu Takaya has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5227275Abstract: Disclosed is a lithographic printing plate material which provides a printing plate which causes no peeling of film even after printing of a large number of prints and even with use of special printing ink such as ultraviolet-curing ink. This printing plate material comprises a polyester film subjected to hydrophilization treatment by coating with an organic copolymer as a support and at least one undercoat layer, at least one emulsion layer containing a silver halide, and an image receiving layer containing physical development nuclei provided on the support in this order, characterized in that the lowermost undercoat layer contiguous to the support contains a bisphenol type epoxy resin latex.Type: GrantFiled: September 28, 1992Date of Patent: July 13, 1993Assignee: Mitsubishi Paper Mills LimitedInventors: Hiroshi Miyazu, Yoshikazu Takaya
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Patent number: 5153097Abstract: The invention provides a light-sensitive material for making lithographic printing plate through high-intensity short-time exposure which comprises a support and, provided thereon, at least a silver halide emulsion layer and a physical development nuclei layer wherein an intermediate layer comprising a water-permeable film forming polymer is provided between the emulsion layer and the nuclei layer. Furthermore, a process for making a lithographic printing plate from said light-sensitive material is provided which comprises subjecting the light-sensitive material to imagewise exposure of high intensity short time, silver complex diffusion transfer development and subsequently treatment with an oxidizing agent for silver and an oleophilic organic compound.Type: GrantFiled: August 19, 1991Date of Patent: October 6, 1992Assignee: Mitsubishi Paper Mills LimitedInventors: Hiroshi Nishinoiri, Yoshikazu Takaya, Yasuo Tsubai, Toshiro Kondo
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Patent number: 4948699Abstract: This invention provides a silver halide photographic light sensitive material and a light sensitive lithographic printing plate material which are enhanced in sensitivity to semiconductor laser beam and improved in storage stability and printing endurance. The former comprises a support and a silver halide emulsion layer containing a sensitizing dye having a spectral sensitivity maximum in a wavelength region longer than 700 nm wherein said emulsion layer contains a water-soluble polymer containing a carboxyl group and having a number-average molecular weight of 20,000 or less and the latter comprises a support and, provided thereon, a silver halide emulsion layer containing a sensitizing dye having a spectral sensitivity maximum in a wavelength region longer than 700 nm and a physical development nuclei layer and said emulsion layer contains the above mentioned water-soluble polymer.Type: GrantFiled: August 1, 1988Date of Patent: August 14, 1990Assignee: Mitsubishi Paper Mills LimitedInventors: Hiroshi Nishinoiri, Toshiro Kondo, Yoshikazu Takaya
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Patent number: 4910129Abstract: Disclosed is a silver halide photographic light sensitive material which has a silver halide emulsion layer optically sensitized with a sensitizing dye having a maximum spectral sensitivity in the region of at least 700 nm, said emulsion layer containing at least one compound represented by the following formula (I) or at least one compound represented by the general formula (I) and at least one compound represented by the general formula (II) in combination: ##STR1## (wherein R.sub.1 and R.sub.2 each represents a hydrogen atom, an alkyl group, an aryl group, an aralkyl group, an alkenyl group, an amino group, an acylamido group or a sulfonamido group and sum of carbon atom numbers of R.sub.1 and R.sub.2 is 3 or more.); ##STR2## (wherein R.sub.3 represents an alkyl group of at least 3 carbon atoms or an aryl group).Type: GrantFiled: April 13, 1988Date of Patent: March 20, 1990Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Yoshiya Takahashi, Susumu Baba, Katsuaki Iwaosa, Motoshige Yamada, Kunihiro Nakagawa, Seigo Ebato, Hiroshi Nishinoiri, Yoshikazu Takaya
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Patent number: 4879193Abstract: Disclosed are a light sensitive material and a lithographic printing plate made therefrom by silver complex diffusion transfer process ree from peeling of layer during printing which comprises a polyester film support made hydrophilic by coating with an organic copolymer as a support and at least one undercoat layer, a silver halide emulsion layer and an image receiving layer containing physical development nuclei layer provided on said support in succession, said undercoat layer contiguous to the support containing a polyfunctional epoxy compound having at least three epoxy groups in molecule.Type: GrantFiled: March 16, 1988Date of Patent: November 7, 1989Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Yoshikazu Takaya, Kazuo Yokoyama
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Patent number: 4873170Abstract: There is provided a method for making a lithographic printing plate having high sensitivity, resolving power and printing endurance and free from scumming utilizing silver complex diffusion transfer process which comprises subjecting to scanning exposure of high-intensity short-time a light sensitive material comprising a support and, provided thereon, at least a silver halide emulsion layer and a physical development nuclei layer as a surface layer and then developing it with a silver complex diffusion transfer developer, the improvement which comprises subjecting the light sensitive material to imagewise exposure with scanning light of at least 700 nm, said emulsion layer containing silver halide grains mainly composed of silver chloride and a sensitizing dye having a sensitivity maximum in the long wavelength region of at least 700 nm in an amount of 3.times.10.sup.-5 -3.times.10.sup.Type: GrantFiled: August 6, 1987Date of Patent: October 10, 1989Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Hiroshi Nishinoiri, Masahiko Saikawa, Yoshikazu Takaya, Euji Kanada
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Patent number: 4784933Abstract: Lithographic printing plates which have such a high sensitivity as permitting use of semiconductor laser beam of low output, a high resolving power and a high printing endurance and are free from occurrence of scumming are made by a method which comprises imagewise exposing a light sensitive material which comprises a support and at least a silver halide emulsion layer and a surface physical development nuclei layer provided on the support, said emulsion layer comprising silver halide grains which contain at least silver bromide and containing at least one sensitizing dye having a maximum spectral sensitivity in the region of longer than 700 .mu.m and then developing the exposed light sensitive material with a silver complex diffusion transfer developer containing at least a thiocyanate. Further improvement can be obtained by providing an antihalation means to keep the reflectance of a light of longer than 700 .mu.m at 13-40%.Type: GrantFiled: November 12, 1986Date of Patent: November 15, 1988Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Eiji Kanada, Yasuo Tsubai, Akira Tanaka, Toshiro Kondo, Yoshikazu Takaya, Masahiko Saikawa, Hiroshi Nishinoiri
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Patent number: 4770961Abstract: Disclosed is a light sensitive material for lithographic printing plate which comprises a support and at least a silver halide emulsion layer and a surface physical development nuclei layer provided on said support wherein said silver halide emulsion layer contains at least one of the sensitizing dyes represented by the following general formulas (I), (II), (III), (IV) and (V):General formula (I) ##STR1## General formula (II) ##STR2## General formula (III) ##STR3## General formula (IV) ##STR4##Type: GrantFiled: October 30, 1986Date of Patent: September 13, 1988Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Akira Tanaka, Eiji Kanada, Yoshikazu Takaya, Masahiko Saikawa, Hidetoshi Miura
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Patent number: 4606985Abstract: Lithographic printing plates which have on a support at least one hardened gelatin-containing layer which contains a photographic gelatin and a low molecular-weight gelatin are improved in printing endurance, e.g., resistances against ink-staining and blinding of image areas.Type: GrantFiled: August 27, 1982Date of Patent: August 19, 1986Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Yoshikazu Takaya, Yasuo Tsubai, Hiroshi Nishinoiri
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Patent number: 4510228Abstract: Disclosed is a photosensitive element for the production of lithographic printing plates improved in printing endurance comprising a support, a physical development nuclei layer, and at least one gelatin-containing layer including a silver halide emulsion layer disposed under said nuclei layer, which is adapted to the silver complex diffusion transfer process to utilize the transferred silver image on said nuclei layer as ink-receptive areas, all of the gelatin-containing layers having a pH value below the isoelectric point of the gelatin used in each layer. Further improvement can be attained by using a photographic gelatin and a low molecular weight gelatin in at least one of said gelatin-containing layers.Type: GrantFiled: April 20, 1983Date of Patent: April 9, 1985Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Yasuo Tsubai, Yoshikazu Takaya, Eiji Kanada
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Patent number: 4376157Abstract: Transfer images of high contrast, high density and high sharpness can be obtained by DTR process wherein all of the physical development nucleus particles are covered with a water permeable colloid having a thickness of at least 10 times the average diameter of the nucleus particles and all of the physical development nucleus particles are substantially two-dimensionally distributed at such intervals as capable of forming a continuous transfer developed silver.Type: GrantFiled: March 19, 1981Date of Patent: March 8, 1983Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Yasuo Tsubai, Yoshikazu Takaya, Takao Senga
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Patent number: 4336321Abstract: In a silver halide photographic material, at least one mercapto complexing agent for silver salt is contained in at least one photographic constituting layer and at least one anion or betaine type cyanine sensitizing dye is contained in silver halide emulsion layer to improve photographic defects such as reduction of sensitivity, softening in tone, etc.Type: GrantFiled: February 4, 1981Date of Patent: June 22, 1982Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Eiji Kanada, Yasuo Tsubai, Shoji Yamada, Yoshikazu Takaya, Takao Senga
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Patent number: 4004928Abstract: Use of the compounds represented by the general formula; ##STR1## (wherein R represents an alkyl group of 1 - 8 carbon atoms) as a permanent solvent for color coupler or ultraviolet ray absorber in color photographic materials.Type: GrantFiled: August 25, 1975Date of Patent: January 25, 1977Assignee: Mitsubishi Paper Mills, Ltd.Inventors: Sadayuki Miyazawa, Yoshikazu Takaya