Patents by Inventor Shigeki Yokoyama
Shigeki Yokoyama 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: 4704439Abstract: Chlorinated linear ultra low density polyethylene containing 3-40% by weight of chlorine produced by chlorinating a linear ultra low density polyethylene having the properties (i)-(iv) cited below, said polyethylene being produced by copolymerizing ethylene and an .alpha.-olefin having 3-12 carbon atoms in the presence of a catalyst comprising a solid catalyst component containing at least magnesium and titanium and an organic aluminum compound.______________________________________ (i) Melt index 0.01-100 g/10 min (ii) Density 0.860-0.910 g/cm.sup.3 (iii) Maximum peak temperature not lower than 100.degree. C.Type: GrantFiled: March 11, 1986Date of Patent: November 3, 1987Assignees: Nippon Oil Company, Limited, Osaka Soda Company, LimitedInventors: Noboru Yamaoka, Shigeki Yokoyama, Kazuo Matsuura, Kozo Misumi, Junichi Watanabe, Seiji Kadomatsu
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Patent number: 4677050Abstract: A silver halide photographic material is described, comprising a support having thereon at least one layer containing a cross-linked polymer represented by formula (I) ##STR1## wherein R.sub.1 and R.sub.2 each represents a hydrogen atom or an unsubstituted or substituted alkyl group; R.sub.3 represents a hydrogen atom, an unsubstituted or substituted alkyl group, cycloalkyl group, aryl group, or acyl group; R.sub.4 represents a hydrogen atom or an unsubstituted or substituted alkyl group; or R.sub.3 and R.sub.Type: GrantFiled: September 4, 1986Date of Patent: June 30, 1987Assignee: Fuji Photo Film Co., Ltd.Inventors: Shigeki Yokoyama, Takayuki Inayama, Naohiko Sugimoto, Takashi Naoi
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Patent number: 4649102Abstract: A silver halide photographic light-sensitive material is described, comprising a support having provided thereon at least one silver halide emulsion layer, wherein there is at least one hydrophilic colloidal layer containing at least one nonionic surface active agent and at least one anionic surface active agent having a polyoxyethylene group therein.Type: GrantFiled: January 10, 1986Date of Patent: March 10, 1987Assignee: Fuji Photo Film Co., Ltd.Inventors: Yasuo Mukunoki, Shigeki Yokoyama, Hiroshi Kawasaki, Ryoichi Nemori, Tetsuo Takeuchi
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Patent number: 4624913Abstract: A silver halide photographic light-sensitive material is described, comprising at least one light-sensitive silver halide emulsion layer on a support, wherein the emulsion in said light-sensitive silver halide emulsion layer comprises a silver iodobromide emulsion containing 3 mol % or more of iodide, and at least one of said light-sensitive emulsion layer or another hydrophilic colloid layer contains a polyoxyethylene type surface active agent and at least one of said light-sensitive emulsion layer or another hydrophilic colloid layer contains a meso-ionic triazolium compound represented by formula (I) ##STR1## wherein X represents a sulfur ion or --N--R.sup.4, and R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each represents a hydrogen atom or a substituted or nonsubstituted alkyl group, aryl group, or heterocyclic group, or R.sup.1 and R.sup.2, R.sup.2 and R.sup.3 or R.sup.3 and R.sup.4 can together form a heterocyclic ring.Type: GrantFiled: February 11, 1985Date of Patent: November 25, 1986Assignee: Fuji Photo Film Co., Ltd.Inventors: Nobuaki Miyasaka, Koki Nakamura, Shigeki Yokoyama
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Patent number: 4623615Abstract: A silver halide photographic light-sensitive material is described having at least one light-sensitive silver halide emulsion layer on a base, wherein the improvement comprises that said light-sensitive silver halide emulsion layer or another hydrophilic colloid layer on said base contains a polyoxyethylene type surfactant and a complex salt of divalent or tetravalent palladium.Type: GrantFiled: October 9, 1984Date of Patent: November 18, 1986Assignee: Fuji Photo Film Co., Ltd.Inventors: Shigeki Yokoyama, Nobuhisa Sekiguchi
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Patent number: 4623614Abstract: A silver halide photographic light-sensitive material is described, comprising a support having thereon at least one silver halide photographic light-sensitive emulsion layer, said photographic light-sensitive material further comprising at least one light-insensitive surface layer on at least one side thereof, at least one of said surface layer or layers comprising a graft polymer or copolymer having a silicone unit, and at least one of said surface layer or layers and a layer or layers adjacent to the surface layer or layers comprising an antistatic agent.The silver halide light-sensitive material has good antistatic property and reduced sliding friction without giving bad influences on the photographic properties; has good antistatic property and lubricity after development processing; has improved antistatic property and lubricity without reducing the coating properties at the production of the photographic light-sensitive material; and forms no scum during development processing.Type: GrantFiled: August 7, 1985Date of Patent: November 18, 1986Assignee: Fuji Photo Film Co., Ltd.Inventors: Masakazu Yoneyama, Yukio Maekawa, Shigeki Yokoyama, Junichi Yamanouchi
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Patent number: 4622288Abstract: A photographic light-sensitive material containing a fluorine-containing graft polymer is disclosed. The graft polymer is derived from a polymerizable hydrophobic fluorine-containing monomer containing at least one fluorine atom and a polymerizable hydrophilic monomer, and optionally, a third polymerizable hydrophobic monomer containing no fluorine atom. The material has an improved antistaticity.Type: GrantFiled: March 11, 1985Date of Patent: November 11, 1986Assignee: Fuji Photo Film Co., Ltd.Inventors: Shigeki Yokoyama, Junichi Yamanouchi, Masakazu Yoneyama, Yukio Maekawa
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Patent number: 4597818Abstract: A novel method for producing laminated sheets or films consisting of a substrate layer or layers and a layer or layers of ultra-high molecular weight polyethylene. The method is characterized by the steps of: superposing at least one layer of ultra-high molecular weight polyethylene in powder or preformed sheet form and at least one layer of a substrate of another material upon one face of a tensioned endless belt travelling around a set of rolls, with an adhesive interposed between said layers if necessary; pressing or squeezing said ultra-high molecular weight polyethylene layer between said substrate layer and said endless belt, or between said substrate layers, against one or more heating rolls under the tension of said endless belt; heating at least said ultra-high molecular weight polyethylene layer to a temperature above its melting point; and thereby uniting said superposed ultra-high molecular weight polyethylene and substrate layers into a laminated sheet or film.Type: GrantFiled: January 24, 1985Date of Patent: July 1, 1986Assignee: Nippon Petrochemicals Company, LimitedInventors: Takeo Aoyama, Syoji Magara, Shigeki Yokoyama, Tadashi Kamei, Mikio Uehara
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Patent number: 4558001Abstract: A silver halide photographic light-sensitive material is disclosed wherein at least one gelatin-containing layer thereof contains at least one nonionic surface active agent having reactive groups, the agent being represented by the following formula (I), (II) or (III) ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 ' each represents a hydrogen atom or a halogen atom, or an unsubstituted or substituted alkyl, aryl, alkoxyl, acyl, amido, sulfonamido, carbamoyl, or sulfamoyl group; R.sub.3 and R.sub.4 each represents a hydrogen atom, an unsubstituted or substituted alkyl or aryl group, or a heteroaromatic ring, R.sub.3 and R.sub.4 may combine to form a ring; m.sub.1 and m.sub.2, which may be the same or different, are 2 to 40, each representing the average degree of polymerization of ethylene oxide; m.sub.3 is 0 or 1; and n.sub.1 and n.sub.2 represent the ratios in the copolymer, and n.sub.1 is 1 to 100 and n.sub.2 is 0 to 99, the sum thereof being 100.Type: GrantFiled: April 13, 1984Date of Patent: December 10, 1985Assignee: Fuji Photo Film Co., Ltd.Inventors: Shigeki Yokoyama, Hisashi Okamura, Yukio Maekawa, Hiroshi Kawasaki
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Patent number: 4555480Abstract: A silver halide photographic light-sensitive material comprising a support having thereon at least one light-sensitive silver halide emulsion layer, wherein the light-sensitive silver halide emulsion layer or other layer is a hydrophilic colloid layer containing a polyoxyethylene surface active agent represented by general formula (I) or (II) described below, and a nitron compound selected from nitron, an inorganic acid salt thereof and an organic acid salt thereof. ##STR1## wherein R.sub.1, R.sub.2, R.sub.6 and R.sub.8, which may be the same or different, each represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkoxy group, a halogen atom, a substituted or unsubstituted acyl group, a substituted or unsubstituted amido group, a substituted or unsubstituted sulfonamido group, a substituted or unsubstituted carbamoyl group or a substituted or unsubstituted sulfamoyl group; R.sub.5 and R.sub.Type: GrantFiled: October 4, 1984Date of Patent: November 26, 1985Assignee: Fuji Photo Film Co., Ltd.Inventors: Shigeki Yokoyama, Koki Nakamura, Jyounichi Kouda, Nobuhisa Sekiguchi
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Patent number: 4518354Abstract: A silver halide photographic light-sensitive material is disclosed. The photographic material is comprised of a support base, a silver halide emulsion layer and an antistatic layer. The antistatic layer contains a nonionic surface active agent having two polyoxyethylene chains in a molecule represented by the formula (I): ##STR1## wherein R.sub.1 and R.sub.3 each represents a substituted or unsubstituted alkyl group, an aryl group, an alkoxy group, a halogen atom, an acyl group, an amido group, a sulfonamido group, a carbamoyl group or a sulfamoyl group, R.sub.2 and R.sub.4 each represents a hydrogen atom, a substituted or unsubstituted alkyl group, an aryl group, an alkoxy group, a halogen atom, an acyl group, an amido group, a sulfonamido group, a carbamoyl group or a sulfamoyl group, R.sub.5 represents a hydrogen atom, a methyl group or an .alpha.-furyl group, and m and n independently represents an average degree of polymerization of ethylene oxide, which is 2 to 40.Type: GrantFiled: May 23, 1983Date of Patent: May 21, 1985Assignee: Fuji Photo Film Co., Ltd.Inventors: Shigeki Yokoyama, Akira Hibino, Yukio Maekawa, Hiroshi Kawasaki
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Patent number: 4510233Abstract: A silver halide photographic light-sensitive material comprised of a support base having thereon a silver halide emulsion layer and an antistatic layer. The antistatic layer contains a nonionic surface active agent having two polyoxyethylene chains in a molecule, the agent being represented by the formula (I): ##STR1## wherein R.sub.1 and R.sub.3 each represents a substituted or non-substituted alkyl, aryl, alkoxy, aryloxy, acyl, amido, sulfonamido, carbamoyl or sulfamoyl group, or a halogen atom, R.sub.2 and R.sub.4 each represents a hydrogen atom, a substituted or nonsubstituted alkyl, aryl, alkoxy, aryloxy, acyl, amido, sulfonamido, carbamoyl or sulfamoyl group, or a halogen atom, R.sub.5 and R.sub.6 each represents a hydrogen atom, or a substituted or nonsubstituted alkyl or aryl group, wherein the sum total of carbon atoms in R.sub.5 and R.sub.6 is 2 or more, or R.sub.5 and R.sub.Type: GrantFiled: May 27, 1983Date of Patent: April 9, 1985Assignee: Fuji Photo Film Co., Ltd.Inventors: Shigeki Yokoyama, Akira Hibino, Yukio Maekawa, Hiroshi Kawasaki
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Patent number: 4495275Abstract: The antistatic property of a silver halide photographic material is effectively improved by incorporating a fluorine-containing water-soluble polymer having a styrene monomer containing a fluorine-containing group as the polymerization unit in at least one of the photographic layers of the photographic material. The incorporation of the polymer does not reduce the adhesion resistance or film strength of the photographic material. The photographic material can also maintain the improved antistatic property for a long period of time.Type: GrantFiled: June 25, 1981Date of Patent: January 22, 1985Assignee: Fuji Photo Film Co., Ltd.Inventors: Shigeki Yokoyama, Kunihiko Ohga
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Patent number: 4388402Abstract: A photographic light-sensitive material is described comprising a support having thereon a silver halide emulsion layer, said material including at least one hydrophilic colloid layer containing at least 0.1 g/m.sup.2 of a water-soluble polymer having a molecular weight of from 10,000 to 500,000 and consisting essentially of a repeating unit represented by formula (I) ##STR1## wherein R represents a hydrogen atom, a halogen atom, or an alkyl group; L represents a single chemical bond or a divalent connecting group; M represents a hydrogen atom, an ammonium ion, or an alkali metal ion; X represents from 10 to 100 mol%; y represents from 0 to 90 mol%; and A represents a copolymerized monomer unit derived from a copolymerizable ethylenically unsaturated monomer.The photographic light-sensitive material has improved antistatic properties without damaging other photographic properties.Type: GrantFiled: August 12, 1981Date of Patent: June 14, 1983Assignee: Fuji Photo Film Co., Ltd.Inventors: Yasuo Mukunoki, Yasuhiro Nakayama, Shigeki Yokoyama
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Patent number: 4374924Abstract: A silver halide photographic light-sensitive material having at least one antistatic layer, said antistatic layer containing a dispersion of polymer represented by the following formula (I): ##STR1## wherein A represents a monomer unit formed from a copolymerizable monomer having at least two ethylenically unsaturated groups, B represents a monomer unit formed from a copolymerizable and monoethylenically unsaturated monomer, R.sub.1 represents a hydrogen atom or a lower alkyl group having 1 to 6 carbon atoms, Q represents a divalent group containing 1 to 12 carbon atoms, R.sub.2, R.sub.3 and R.sub.4 may be the same or different and each represents an alkyl group containing 1 to 20 carbon atoms, or an aralkyl group containing 7 to 20 carbon atoms, or R.sub.2, R.sub.3 and R.sub.4 may combine to form a ring together with the nitrogen atom, X.sup..crclbar. represents an anion, x is about 0.25 to 10 mol%, y is about 0 to 90 mol%, and z is about 10 to 99 mol%.Type: GrantFiled: February 24, 1982Date of Patent: February 22, 1983Assignee: Fuji Photo Film Co., Ltd.Inventors: Shigeki Yokoyama, Shinzo Kishimoto, Itsuki Toriya, Taku Nakamura
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Patent number: 4366238Abstract: The antistatic property of a silver halide photographic material is effectively improved by incorporating a fluorine-containing water-insoluble polymer having a styrene monomer containing a fluorine-containing group as the polymerization unit in at least one of the photographic layers of the photographic material. The incorporation of the polymer does not reduce the adhesion resistance or film strength of the photographic material. The photographic material can also maintain the improved antistatic property for a long period of time.Type: GrantFiled: June 25, 1981Date of Patent: December 28, 1982Assignee: Fuji Photo Film Co., Ltd.Inventors: Shigeki Yokoyama, Kunihiko Ohga
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Patent number: 4362812Abstract: Static property in a photographic material is effectively prevented by incorporating a specific copolymer formed from, as the copolymerizable components, a betaine-containing polymerizable monomer and a fluorine-containing polymerizable monomer, in the protective layer, backing layer, or an overcoat of the photographic material without exhibiting adverse influences on the photographic properties of the photographic material.Type: GrantFiled: July 10, 1981Date of Patent: December 7, 1982Assignee: Fuji Photo Film Co., Ltd.Inventors: Junji Minamizono, Shinzo Kishimoto, Shigeki Yokoyama, Takayuki Inayama
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Patent number: 4304847Abstract: A color image forming process which comprises processing a photographic light-sensitive element comprising a support having thereon a layer containing imagewise distributed silver therein with an aqueous alkaline solution containing a stannous ion and in the presence of a dye and a bispyridinium compound represented by the following general formula: ##STR1## wherein R.sub.1 and R.sub.2 each represents a lower aliphatic hydrocarbon group or R.sub.1 and R.sub.2 are bonded each other to form a ring; n represents 0 or 1; and X.sup.- represents an anion; to bleach the dye in an imagewise manner. By the process of the present invention, color images which are stable to light, heat and moisture are formed using light-sensitive elements containing a reduced amount of silver salt and without using chemicals causing environmental pollution problems for the processing.Type: GrantFiled: November 13, 1979Date of Patent: December 8, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Koichi Nakamura, Isao Shimamura, Yukio Maekawa, Koichi Koyama, Shigeki Yokoyama