Patents by Inventor Naoji Kurata
Naoji Kurata 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: 5403958Abstract: Disclosed is an electrophotographic member containing as a charge transport material a fluorine-containing N,N,N',N'-tetraarylbenzidine derivative which is remarkably excellent in solubility in an organic solvent and/or a binder such as polycarbonate resin, etc., can show very excellent electrophotographic properties such as high sensitivity, low residual potential and high durability. Further, a fluorine-containing N,N,N',N'-tetraarylbenzidine derivative usable as a charge transport material, and a process for producing the same are disclosed. Furthermore, a fluorine-containing diarylamine usable for producing the fluorine-containing N,N,N',N'-tetraarylbenzidine derivative, and a process for producing the same are disclosed.Type: GrantFiled: April 30, 1993Date of Patent: April 4, 1995Assignee: Hitachi Chemical Co., Ltd.Inventors: Yoshii Morishita, Yasushi Sugimoto, Shigeru Hayashida, Hiroko Ishikawa, Yoshiaki Noda, Shigeru Murakami, Munehiro Sato, Yoshinori Saito, Naoji Kurata, Yoshio Sugita
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Patent number: 5352834Abstract: Disclosed is an electrophotographic member containing as a charge transport material a fluorine-containing N,N,N',N'-tetraarylbenzidine derivative which is remarkably excellent in solubility in an organic solvent and/or a binder such as polycarbonate resin, etc., can show very excellent electrophotographic properties such as high sensitivity, low residual potential and high durability. Further, a fluorine-containing N,N,N',N'-tetraarylbenzidine derivative usable as a charge transport material, and a process for producing the same are disclosed. Furthermore, a fluorine-containing diarylamine usable for producing the fluorine-containing N,N,N',N'-tetraarylbenzidine derivative, and a process for producing the same are disclosed.Type: GrantFiled: June 8, 1992Date of Patent: October 4, 1994Assignee: Hitachi Chemical Company, Ltd.Inventors: Yoshii Morishita, Yasushi Sugimoto, Shigeru Hayashida, Hiroko Ishikawa, Yoshiaki Noda, Shigeru Murakami, Munehiro Sato, Yoshinori Saito, Naoji Kurata, Yoshio Sugita
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Patent number: 5160487Abstract: Disclosed is an electrophotographic member containing as a charge transport material a fluorine-containing N,N,N',N'-tetraarylbenzidine derivative which is remarkably excellent in solubility in an organic solvent and/or a binder such as polycarbonate resin, etc., can show very excellent electrophotographic properties such as high sensitivity, low residual potential and high durability. Further, a fluorine-containing N,N,N',N'-tetraarylbenzidine derivative usable as a charge transport material, and a process for producing the same are disclosed. Furthermore, a fluorine-containing diarylamine usable for producing the fluorine-containing N,N,N',N'-tetraarylbenzidine derivative, and a process for producing the same are disclosed.Type: GrantFiled: September 4, 1991Date of Patent: November 3, 1992Assignee: Hitachi Chemical Company, Ltd.Inventors: Yoshii Morishita, Yasushi Sugimoto, Shigeru Hayashida, Hiroko Ishikawa, Yoshiaki Noda, Shigeru Murakami, Munehiro Sato, Yoshinori Saito, Naoji Kurata, Yoshio Sugita
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Patent number: 4831189Abstract: A process for producing an aromatic dicarboxylic acid which comprises subjecting a "K-region" arene to liquid phase oxidation with hydrogen peroxide in a water-insoluble organic solvent in the presence of a tungsten compound and a phase transfer catalyst and optionally a mineral acid.Type: GrantFiled: February 20, 1986Date of Patent: May 16, 1989Assignees: Nippon Shokubai Kagaku Kogyo Co. Ltd., Nihon Jyoryu Kogyo Co., Ltd.Inventors: Yoshinori Saito, Shinichi Araki, Yoshio Sugita, Naoji Kurata
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Patent number: 4814462Abstract: A polyoxyalkylene carbazole adduct represented by the following formula I: ##STR1## wherein R stands for at least one member selected from the group consisting of H, CH.sub.3 and C.sub.6 H.sub.5, R' for at least one member selected from the group consisting of CH.sub.3, C.sub.6 H.sub.5 and H, (providing that R' is at least one member selected from the group consisting of CH.sub.3 and C.sub.6 H.sub.5 when R is H, and R is at least one member selected from the group consisting of CH.sub.3 and C.sub.6 H.sub.5 when R' is H), n for an integer of the value of 0 to 500, m for an integer of the value of 0 to 500, and n+m for an integer of the value of 2 to 1000.Type: GrantFiled: July 7, 1986Date of Patent: March 21, 1989Assignees: Nihon Joryu Kogyo Co., Ltd, Nippon Shokubai Kagaku Kogyo Co., Ltd.Inventors: Naoji Kurata, Yoshio Sugita, Keiji Kobayashi, Atsushi Kawano
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Patent number: 3989763Abstract: A process for the preparation of alcohols by oxidizing aliphatic saturated hydrocarbons, having 10-20 carbon atoms, in the presence of a boron compound, contacting the oxidation reaction mixture with water, removing the aqueous solution of boric acid, and separating the resulting oil layer with saponification and washing with water. A boron compound is added to the resulting oil layer to esterify the alcohols therein. The resulting mixture is distilled to remove unreacted hydrocarbons, the residue comprising borate esters of alcohols is contacted with water, the aqueous solution of boric acid is removed, and the resulting oil layer is separated and distilled to recover the desired alcohols.Type: GrantFiled: September 20, 1974Date of Patent: November 2, 1976Assignee: Nippon Shokubai Kagaku Kogyo Co., Ltd.Inventors: Toshihiro Fujii, Naoji Kurata, Yukio Okuda
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Patent number: 3959389Abstract: An improvement is provided in the manufacture of alkylene oxide adducts of an aliphatic alcohol in which the reaction mixture, comprising the alkylene oxide adduct, unreacted alcohol, acid catalyst residue, carbonyl compounds and hydrocarbons, is treated to remove unreacted alcohol for recycle to the adduct formation step. To prevent the build-up in the system of carbonyl compounds and hydrocarbons which are not easily distillable from the recycle alcohol because of their respective boiling points, at least a portion of the recycle alcohol is esterified with boric acid, the esterification mixture is subjected to distillation to remove volatile portions, and the borate ester thus obtained is hydrolyzed to recover the alcohol which is recycled to the adduct formation step.Type: GrantFiled: February 1, 1974Date of Patent: May 25, 1976Assignee: Nippon Shokubai Kagaku Kogyo Co., Ltd.Inventors: Naoji Kurata, Kazuo Koshida, Toshihiro Fujii, Koichi Matsuhiro, Yukio Okuda
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Patent number: 3932531Abstract: An improvement is provided in the manufacture of alkylene oxide adducts of an aliphatic alcohol in which the reaction mixture, comprising the alkylene oxide adduct, unreacted alcohol, acid catalyst residue, carbonyl compounds and hydrocarbons, is treated to remove unreacted alcohol for recycle to the adduct formation step. To prevent the build-up in the system of carbonyl compounds and hydrocarbons which are not easily distillable from the recycle alcohol because of their respective boiling points, at least a portion of the recycle alcohol is esterified with boric acid, the esterification mixture is subjected to distillation to remove volatile portions, and the borate ester thus obtained is hydrolyzed to recover the alcohol which is recycled to the adduct formation step.Type: GrantFiled: July 14, 1972Date of Patent: January 13, 1976Assignee: Nippon Shokubai Kaguku Kogyo Co., Ltd.Inventors: Naoji Kurata, Kazuo Koshida, Toshihiro Fujii, Koichi Matsushiro, Yukio Okuda