Patents by Inventor Syu Watarai
Syu Watarai 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: 5426012Abstract: An electrophotographic printing plate precursor is disclosed, which comprises an electrically conductive support having thereon a photoconductive layer containing a photoconductive pigment and binder resin which is designated to undergo an electrophotographic process wherein a toner image is formed and the photoconductive layer in the non-image portion other than the toner image portion is then removed to form a printing plate, wherein said photoconductive pigment is a phthalocyanine pigment and said photoconductive layer further comprises at least one compound selected from the compounds represented by the formulae (I), (II) and (III): ##STR1## wherein Z represents a sulfur atom or an oxygen atom, R.sup.1 represents an alkyl group, an alkoxy group, a single ring or double condensed ring aryl group, a single ring or a double condensed ring aryloxy group, or a univalent group derived from a heterocyclic ring, and the two R.sup.1 groups in general formula (III) may be the same or different;R.sup.2 and R.sup.Type: GrantFiled: January 18, 1990Date of Patent: June 20, 1995Assignee: Fuji Photo Film Co., Ltd.Inventors: Hiroaki Yokoya, Hiromichi Tachikawa, Syu Watarai
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Patent number: 5344694Abstract: A liquid developer for electrostatic photography, said liquid developer comprising resin particles dispersed in a non-aqueous solvent having a volume resistivity of at least 10.sup.9 .OMEGA.cm, said dispersed resin particles being obtained by polymerizing(a) at least one member of methyl methacrylate and ethyl methacrylate soluble in said non-aqueous solvent and(b) at least one member selected from the group consisting of acrylic esters and methacrylic esters having an alkyl group having not more than 4 carbon atoms, said esters being soluble in said non-aqueous solvent, but being made insoluble by polymerization,said components (a) and (b) being polymerized in the presence of a dispersion stabilizing resin which is soluble in said non-aqueous solvent, and said dispersion stabilizing resin comprising a graft copolymer formed by polymerizing(i) at least one member of macromonomers (M) having a weight-average molecular weight of 1.times.10.sup.3 to 4.times.10.sup.Type: GrantFiled: May 19, 1992Date of Patent: September 6, 1994Assignee: Fuji Photo Film Co., Ltd.Inventors: Seiji Horie, Kenji Sano, Nobuo Suzuki, Syu Watarai
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Patent number: 5102760Abstract: A novel electrophotographic photoreceptor for copiers or photoprinters is provided comprising a photoconducting layer provided on an electrically conductive support, wherein said photoconducting layer comprises a phthalocyanine pigment and at least one compound represented by the general formula (I) or (II): ##STR1## wherein Z represents a sulfur atom or oxygen atom; R.sup.1 and R.sup.2 may be the same or different and each represents a hydrogen atom, alkyl group, aryl group or aralkyl group; A represents an alkyl group, aryl group, aralkyl group or monovalent heterocyclic group; and B represents an alkylene group, arylene group, polymethylene group or aralkylene group.Type: GrantFiled: September 18, 1990Date of Patent: April 7, 1992Assignee: Fuji Photo Film Co., Ltd.Inventors: Hiroaki Yokoya, Hiromichi Tachikawa, Syu Watarai, Syunichi Kondo, Seiji Horie
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Patent number: 5075171Abstract: There is provided a conductive film and a method for preparing same. The conductive film is prepared by forming a prime-coating layer of a three-dimensional network structure on a base and by applying a semiconductive compound-containing solution onto the prime-coating layer to form a conductive layer. The conductive film is excellent in conductivity and transparency as well as adhesion of the conductive layer.Type: GrantFiled: March 26, 1991Date of Patent: December 24, 1991Assignee: Fuji Photo Film Co., Ltd.Inventors: Syunichi Kondo, Syu Watarai
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Patent number: 5069992Abstract: An electrophotographic printing plate precursor comprising an electrically-conductive support having thereon a photoconductive layer containing at least a photoconductive compound and a binding resin wherein said binding resin is an alkali-soluble polyurethane resin.Type: GrantFiled: November 16, 1990Date of Patent: December 3, 1991Assignee: Fuji Photo Film Co., Ltd.Inventors: Hiromichi Tachikawa, Hiroaki Yokoya, Syu Watarai, Toshiaki Aoai
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Patent number: 5063129Abstract: A electrophotographic printing plate precursor comprising an electrically-conductive support having thereon a photoconductive layer containing at least photoconductive pigments and a binder resin, wherein said photoconductive pigments are phthalocyanine pigments and said photoconductive layer further comprises a compound represented by the general formula (I), (II) or (III): ##STR1## wherein Z represents a sulfur or oxygen atom; Ar represents a monovalent aromatic hydrocarbon group or monovalent heterocyclic group; R.sub.3 represents a hydrogen atom, alkyl group, aryl group or aralkyl group; Ar and R.sub.3 may together form a ring; and R.sub.1 and R.sub.2, which may be the same or different, each represents an alkyl group, aryl group or aralkyl group, with the proviso that the aromatic hydrocarbon group and heterocyclic group represented by Ar and the alkyl, aryl and aralkyl group represented by R.sub.1, R.sub.2 and R.sub.Type: GrantFiled: December 13, 1989Date of Patent: November 5, 1991Assignee: Fuji Photo Film Co., Ltd.Inventors: Hiroaki Yokoya, Hiromichi Tachikawa, Syu Watarai
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Patent number: 5015551Abstract: An electrophotographic liquid developer is disclosed. The developer is comprised of resin particles dispersed in a high-insulating low dielectric non-aqueous solvent. The resin particles are prepared by polymerizing or copolymerizing a specific styrenic monomer in an organic solvent containing a polymer which is substantially soluble in the organic solvent. The liquid developer is particularly suitable for making a printing plate or sheet by an electrophotographic process.Type: GrantFiled: May 23, 1984Date of Patent: May 14, 1991Assignee: Fuji Photo Film Co., Ltd.Inventors: Hiromichi Tachikawa, Hiroaki Yokoya, Nobuo Suzuki, Syu Watarai
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Patent number: 5004641Abstract: An electroconductive element comprising a support, a subbing layer, and an electroconductive layer, wherein the electroconductive layer is formed by coating, on the subbing layer, a solution comprising:(A) a compound semiconductor,(B) a solvent dissolving the compound semiconductor, and(C) a resin or a resin precursor soluble in the solvent.Type: GrantFiled: April 10, 1989Date of Patent: April 2, 1991Assignee: Fuji Photo Film Co., Ltd.Inventors: Syunichi Kondo, Syu Watarai
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Patent number: 4734351Abstract: A liquid developer for electrostatic charge images comprising a polymer selected from (a) a polymer containing at least one polymerizable monomer represented by the following general formula (1) as a component of the polymer, and (b) a polymer containing at least one polymerizable monomer represented by the following general formula (2) and chloromethylstyrene a copolymer components, the polymer being dispersed in a carrier liquid having an electric resistance of at least 10.sup.9 .OMEGA..cm and a dielectric constant of at most 3, ##STR1## wherein all the symbols are defined in the specification.Type: GrantFiled: September 30, 1986Date of Patent: March 29, 1988Assignee: Fuji Photo Film Co., Ltd.Inventors: Katsuji Kitatani, Hiroaki Yokoya, Syu Watarai
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Patent number: 4724192Abstract: An electrophotographic photoreceptor is disclosed, comprising a conductive support having provided thereon a light-sensitive layer containing at least one of a specific type of bisstilbene compound as a photoconductive substance or a charge transporting material. The photoreceptor has high sensitivity, a small residual potential, and stability to ozone, light, or heat.Type: GrantFiled: August 1, 1986Date of Patent: February 9, 1988Assignee: Fuji Photo Film Co., Ltd.Inventors: Naonori Makino, Seiji Horie, Syu Watarai, Hideo Sato
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Patent number: 4681832Abstract: A novel electrophotographic liquid developer is provided, comprising a coloring agent, a coating agent, a dispersant, an electric charge adjustor, and a carrier liquid, wherein said coating agent is a copolymer of a long-chain alkyl acrylate or methacrylate and a methyl methacrylate, and has a softening temperature within the range of from 40.degree. to 140.degree. C. and a number-average molecular weight of from 5.times.10.sup.3 to 1.times.10.sup.5. The long-chain alkyl group is a straight-chain or branched alkyl group having from 8 to 22 carbon atoms. In preferred embodiments, the long-chain alkyl methacrylate is 2-ethylhexyl methacrylate, lauryl methacrylate, or stearyl methacrylate.Type: GrantFiled: January 10, 1986Date of Patent: July 21, 1987Assignee: Fuji Photo Film Co., Ltd.Inventors: Hiromichi Tachikawa, Hiroaki Yokoya, Syu Watarai, Katuzi Kitatani
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Patent number: 4229510Abstract: A photoconductive polymer material having the following repeating unit: ##STR1## wherein R represents an alkyl group is disclosed.Type: GrantFiled: April 26, 1979Date of Patent: October 21, 1980Assignee: Fuji Photo Film Co., Ltd.Inventors: Syu Watarai, Kenichi Sawada, Takeshi Saida
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Patent number: 3999989Abstract: A photosensitizer for electrophotographic photosensitive materials comprising inorganic or organic acid salts of indoline spirobenzopyranes of the formula ##STR1## R.sub.1, R hd 2, R.sub.3, X and Y are defined in the specification.Type: GrantFiled: January 25, 1974Date of Patent: December 28, 1976Assignee: Fuji Photo Film Co., Ltd.Inventors: Hisatake Ono, Syu Watarai, Chiaki Osada
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Patent number: 3933509Abstract: A photo-polymerizable composition comprising (A) a photopolymerization initiator comprising at least one inorganic or organic acid salt of an indolinobenzospiropyran represented by the following general formula (I): ##SPC1##wherein R.sub.1 represents an alkyl group, substituted alkyl group or a phenyl group; R.sub.2 and R.sub.3 each represents an alkyl group or a phenyl group or, when taken together, R.sub.2 and R.sub.3 form a methylene chain CH.sub.2 wherein n is an integer of 4 or 5; X represents a hydrogen atom, a nitro group, a halogen atom, a carboxy group; and Y represents one or more substituents selected from the group consisting of a hydrogen atom, a nitro group, a halogen atom, a formyl group and an alkoxy group, and (B) at least one cationically polymerizable substance.Type: GrantFiled: August 22, 1973Date of Patent: January 20, 1976Assignee: Fuji Photo Film Co., Ltd.Inventors: Yasuhiro Noguchi, Syu Watarai, Chiaki Osada, Hisatake Ono
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Patent number: 3930851Abstract: An electrophotographic member comprising a resin binder and an organic photoconductive composition and a process using the electrophotographic member, the composition consisting essentially of a compound of the formula (A), its dimeric compound or its polymeric compound: ##SPC1##Whereim R.sub.1 is hydrogen atom, halogen atom, alkyl group having 1 to 4 carbon atoms, alkoxy group having 1 to 4 carbon atoms, alkoxycarbonyl group having alkyl group 1 to 4 carbon atoms, nitro group, alkylene group having 1 to 3 carbon atoms which is capable of forming a bis-compound, or a bond which is capable of forming a bis-compound, R.sub.Type: GrantFiled: March 28, 1974Date of Patent: January 6, 1976Assignee: Fuji Photo Film Co., Ltd.Inventors: Hisatake Ono, Syu Watarai, Harumi Katsuyama