Patents by Inventor Shoji Umehara
Shoji Umehara 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: 9785102Abstract: A rotatable fixing member includes an elastic layer, a primer layer provided on the elastic layer, and a parting layer provided on the primer layer. The primer layer contains a crystalline fluorocarbon polymer having a functional group and has a thickness of 850 nm or less. The parting layer is a coating layer of a crystalline fluorocarbon polymer.Type: GrantFiled: December 31, 2013Date of Patent: October 10, 2017Assignee: Canon Kabushiki KaishaInventors: Masahito Omata, Shoji Umehara, Shuichi Tetsuno, Akeshi Asaka, Masayuki Onuma, Yusuke Baba, Kazuo Kishino
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Publication number: 20140112692Abstract: A rotatable fixing member includes an elastic layer, a primer layer provided on the elastic layer, and a parting layer provided on the primer layer. The primer layer contains a crystalline fluorocarbon polymer having a functional group and has a thickness of 850 nm or less. The parting layer is a coating layer of a crystalline fluorocarbon polymer.Type: ApplicationFiled: December 31, 2013Publication date: April 24, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Masahito Omata, Shoji Umehara, Shuichi Tetsuno, Akeshi Asaka, Masayuki Onuma, Yusuke Baba, Kazuo Kishino
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Patent number: 8208844Abstract: A fixing roller of an image fixing apparatus has an elastic layer on a core metal and has a thermal conductive fluororubber latex layer containing a mixture of fluororubber, fluororesin and thermal conductive fillers more outer side than the elastic. An intermediate layer made of silicone rubber having higher thermal conductivity than the thermal conductive fluororubber latex layer is provided between the thermal conductive fluororubber latex layer and the elastic layer, and the intermediate layer is configured so that an elastic parameter Y(=H×T) satisfies a relational expression: Y?4200 where H (degree) is Asker-C hardness of the silicone rubber having higher thermal conductivity (500 g load) and T (?m) is a thickness of the silicone rubber having higher thermal conductivity.Type: GrantFiled: May 8, 2009Date of Patent: June 26, 2012Assignee: Canon Kabushiki KaishaInventors: Masahito Omata, Shoji Umehara, Kazuo Kishino, Katsuhisa Matsunaka, Yoji Tomoyuki
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Publication number: 20110082260Abstract: A rotatable fixing member includes an elastic layer, a primer layer provided on the elastic layer, and a parting layer provided on the primer layer. The primer layer contains a crystalline fluorocarbon polymer having a functional group and has a thickness of 850 nm or less. The parting layer is a coating layer of a crystalline fluorocarbon polymer.Type: ApplicationFiled: October 1, 2010Publication date: April 7, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Masahito Omata, Shoji Umehara, Shuichi Tetsuno, Akeshi Asaka, Masayuki Onuma, Yusuke Baba, Kazuo Kishino
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Publication number: 20090285611Abstract: A roller for fixing and an image fixing apparatus using the roller for fixing that can prevent wrinkles from occurring on a roller surface. The roller for fixing includes at least an elastic layer on a core metal and includes a thermal conductive fluororubber latex layer containing a mixture of fluororubber, fluororesin and thermal conductive fillers more outer side than the elastic layer, wherein an intermediate layer made of silicone rubber having higher thermal conductivity than the thermal conductive fluororubber latex layer is provided between the thermal conductive fluororubber latex layer and the elastic layer, and the intermediate layer is configured so that an elastic parameter Y(=H×T) satisfies a relational expression: Y?4200 where H (degree) is Asker-C hardness of the silicone rubber having higher thermal conductivity (500 g load) and T (?m) is a thickness of the silicone rubber having higher thermal conductivity.Type: ApplicationFiled: May 8, 2009Publication date: November 19, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Masahito Omata, Shoji Umehara, Kazuo Kishino, Katsuhisa Matsunaka, Yoji Tomoyuki
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Patent number: 7598012Abstract: Disclosed herein are a coloring compound represented by the general formula: A-L1-X-L2-B??(1) wherein A is a coloring moiety, B is a stabilizing moiety having fading-preventing ability, L1 and L2 are linkers for linking A, X and B by covalent bonding and denote, independently of each other, any group of —O—,—CO—, —OCO—, —NR1— (in which R1 is a group selected from hydrogen, alkyl, aryl and aralkyl groups), —NHCO—, —NHCOO—, —NHCONH—, —NHCSNH—, —SO—, —SO2—, —SO2NH—, —S—, —SS— and —CH2—, with the proviso that L1 and L2 are not —CH2— at the same time, and X is a spacer moiety and denotes any group of an alkylene group having 1 to 10 carbon atoms, an alkenylene group having 2 to 10 carbon atoms, an alkynylene group having 2 to 10 carbon atoms, an alkoxyalkylene group having 1 to 10 carbon atoms, a cycloalkylene group having 5 to 7 carbon atoms, an arylene group having 6 to 10 carbon atoms and a pyranose type saccharide having 1 to 7 saccharide units, and a recording material using the coloring compound as a colorType: GrantFiled: May 14, 2004Date of Patent: October 6, 2009Assignee: Canon Kabushiki KaishaInventors: Yasuaki Murai, Masakazu Matsumoto, Shoji Umehara, Takeshi Miyazaki
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Publication number: 20060183046Abstract: Disclosed herein are a coloring compound represented by the general formula: A-L1-X-L2-B (1) wherein A is a coloring moiety, B is a stabilizing moiety having fading-preventing ability, L1 and L2 are linkers for linking A, X and B by covalent bonding and denote, independently of each other, any group of —O—, —CO—, —OCO—, —NR1— (in which R1 is a group selected from hydrogen, alkyl, aryl and aralkyl groups), —NHCO—, —NHCOO—, —NHCONH—, —NHCSNH—, —SO—, —SO2—, —SO2NH—, —S—, —SS— and —CH2-, with the proviso that L1 and L2 are not —CH2— at the same time, and X is a spacer moiety and denotes any group of an alkylene group having 1 to 10 carbon atoms, an alkenylene group having 2 to 10 carbon atoms, an alkynylene group having 2 to 10 carbon atoms, an alkoxyalkylene group having 1 to 10 carbon atoms, a cycloalkylene group having 5 to 7 carbon atoms, an arylene group having 6 to 10 carbon atoms and a pyranose type saccharide having I to 7 saccharide units, and a recording material using the coloring compound as a colorinType: ApplicationFiled: May 14, 2004Publication date: August 17, 2006Applicant: Canon Kabushiki KaishaInventors: Yasuaki Murai, Masakazu Matsumoto, Shoji Umehara, Takeshi Miyazaki
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Patent number: 4990625Abstract: A process for synthesizing an N,N-disubstituted hydrazone comprises carrying out nitrozation by adding an aqueous solution of sodium nitrite to a solution having one part by weight of an N,N-disubstituted amine dissolved in 3 to 30 parts by weight of an organic acid, then reducing the nitrozated product to an N,N-disubstituted hydrazine by adding a reducing agent to the mixture containing the nitrozated product, and thereafter adding to the mixture containing the N,N-disubstituted hydrazine a carbonyl compound of the formula: ##STR1## wherein A represents an aromatic hydrocarbon group or an aromatic heterocyclic group which may have a substituent, B represents a hydrogen atom, an alkyl group, an aryl group or an aromatic heterocyclic group, which may have a substituent, thereby performing condensation of the N,N-disubstituted hydrazine with the carbonyl compound.Type: GrantFiled: December 5, 1989Date of Patent: February 5, 1991Assignee: Canon Kabushiki KaishaInventors: Tetsuo Arita, Minoru Mabuchi, Shoji Umehara, Kiyoshi Sakai
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Patent number: 4868080Abstract: An electrophotographic photosensitive member has a photosensitive layer on an electroconductive support, characterized in that the photosensitive member contains an azo pigment having an organic residue represented by the formula (I).Type: GrantFiled: November 27, 1987Date of Patent: September 19, 1989Assignee: Canon Kabushiki KaishaInventors: Shoji Umehara, Yoshio Kashizaki
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Patent number: 4830944Abstract: A function separated type electrophotographic photosensitive member for infrared rays comprises a combination of a charge generation material and a charge transport material, wherein the electrophotographic photosensitive member for infrared rays contains as the charge generation material a disazo pigment represented by Formula (1).Type: GrantFiled: December 19, 1986Date of Patent: May 16, 1989Assignee: Canon Kabushiki KaishaInventors: Shoji Umehara, Masakazu Matsumoto, Takao Takiguchi, Shozo Ishikawa
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Patent number: 4760003Abstract: An electrophotographic photosensitive member comprises a photosensitive layer on a substrate, said photosensitive layer comprising a disazo pigment represented by the formula (1).Type: GrantFiled: May 21, 1986Date of Patent: July 26, 1988Assignee: Canon Kabushiki KaishaInventors: Masakazu Matsumoto, Takao Takiguchi, Masataka Yamashita, Shoji Umehara, Shozo Ishikawa, Hajime Miyazaki
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Patent number: 4743523Abstract: A photosensitive member for electrophotography comprising a photosensitive layer containing an azo pigment selected from those represented by the following formulas (1)-(6): ##STR1## wherein R is an alkyl, aralkyl, aryl, or acyl each capable of having a substituent; Ar is an arylene or heterocyclic group each capable of having a substituent; Ar is a coupler residue group having a phenolic OH group; B is hydrogen, nitroso, or an alkyl, aralkyl, aryl or acyl group capable of having a substituent; and n is 0 or 1.Type: GrantFiled: March 27, 1986Date of Patent: May 10, 1988Assignee: Canon Kabushiki KaishaInventors: Masataka Yamashita, Takao Takiguchi, Shoji Umehara, Masakazu Matsumoto, Shozo Ishikawa
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Patent number: 4735882Abstract: An electrophotographic photosensitive member comprises a photosensitive layer containing an azo pigment selected from the following general formulae (1) to (5): ##STR1## wherein groups Ar are arylene groups and divalent heterocyclic groups, each of which may contain a substituent; n is 0 or 1; and group A is a coupler residue group having a phenolic OH group.Type: GrantFiled: April 1, 1986Date of Patent: April 5, 1988Assignee: Canon Kabushiki KaishaInventors: Masataka Yamashita, Takao Takiguchi, Shoji Umehara, Masakazu Matsumoto, Shozo Ishikawa
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Patent number: 4702982Abstract: This invention relates to an electrophotographic photosensitive member utilizing a novel electrophotographic photosensitive material, more particularly to an electrophotographic photosensitive member endowed with high sensitivity as well as excellent potential stability during repeated copying by incorporating an azo pigment having a specific molecular structure in the photosensitive layer.Type: GrantFiled: May 22, 1986Date of Patent: October 27, 1987Assignee: Canon Kabushiki KaishaInventors: Masakazu Matsumoto, Takao Takiguchi, Masataka Yamashita, Shoji Umehara, Shozo Ishikawa
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Patent number: 4666810Abstract: An electrophotographic photosensitive member comprises a photosensitive layer containing an azo pigment selected from the general formulae (1) to (6).Type: GrantFiled: April 15, 1986Date of Patent: May 19, 1987Assignee: Canon Kabushiki KaishaInventors: Shoji Umehara, Masakazu Matsumoto, Takao Takiguchi, Masataka Yamashita, Shozo Ishikawa
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Patent number: 4501808Abstract: An organic film comprising at least one compound of the following formulae (1)-(5): ##STR1## wherein R.sub.11 and R.sub.13 each represent substituted or unsubstituted aryl, R.sub.12 represents substituted or unsubstituted arylene, and A.sup..crclbar. represents an anionic residue; ##STR2## wherein R.sub.21, R.sub.22, and R.sub.24 each represent substituted or unsubstituted aryl, R.sub.23 represents substituted or unsubstituted arylene, and A.sup..crclbar. represents an anionic residue; ##STR3## wherein R.sub.31, R.sub.33, and R.sub.35 each represent substituted or unsubstituted aryl, R.sub.32 and R.sub.34 each represent substituted or unsubstituted arylene, and A.sup..crclbar. represents an anionic residue; ##STR4## wherein R.sub.41 represents alkyl, substituted or unsubstituted phenyl, or substituted or unsubstituted styryl, R.sub.42 represents substituted or unsubstituted arylene, R.sub.43 represents substituted or unsubstituted aryl, and A.sup..crclbar.Type: GrantFiled: August 25, 1983Date of Patent: February 26, 1985Assignee: Canon Kabushiki KaishaInventors: Kiyoshi Sakai, Shozo Ishikawa, Tetsuo Arita, Minoru Mabuchi, Shoji Umehara
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Patent number: 4418133Abstract: An organic photoconductive material represented by the formula ##STR1## wherein A is an atomic group necessary for completing a substituted or unsubstituted aromatic hydrocarbon ring, Ar is a substituted or unsubstituted group, and Cp is a coupler residue.Type: GrantFiled: March 4, 1982Date of Patent: November 29, 1983Assignee: Canon Kabushiki KaishaInventors: Kazuharu Katagiri, Shoji Umehara, Katsunori Watanabe, Shozo Ishikawa