Patents by Inventor Akihiko Kaji
Akihiko Kaji 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: 7662481Abstract: An endless belt for use as an intermediate transfer belt or a transfer-sheet transfer belt in an electrophotographic apparatus using electrophotographic technologies such as a full-color LBP (Laser Beam Printer) or a full-color PPC (Plane Paper Copier). At least a base layer of the belt comprises a modified polyamide imide resin formed by copolymerizing: (A) an aromatic isocyanate compound; (B) an aromatic polycarboxylic acid anhydride; and (C) a polymer having carboxylic acids at both terminals thereof.Type: GrantFiled: March 3, 2005Date of Patent: February 16, 2010Assignee: Tokai Rubber Industries, Ltd.Inventors: Satoshi Suzuki, Yousuke Hayashi, Akihiko Kaji, Keisuke Tokoro, Tsukasa Fujita, Shigeki Kanda
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Patent number: 7288058Abstract: A semi-conductive roll is provided including a shaft, a low-hardness base layer formed on an outer circumferential surface of the shaft, and a coating layer formed by coating the low-hardness base layer radially outwardly. The coating layer includes one of a rubber material and an elastomer material that is crosslinked by at least one resin crosslinking agent.Type: GrantFiled: December 29, 2003Date of Patent: October 30, 2007Assignee: Tokai Rubber Industries, Ltd.Inventors: Akihiko Kaji, Motoharu Ishihara, Hirofumi Okuda, Yasuki Ohtake
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Publication number: 20050196202Abstract: An endless belt for use as an intermediate transfer belt or a transfer-sheet transfer belt in an electrophotographic apparatus using electrophotographic technologies such as a full-color LBP (Laser Beam Printer) or a full-color PPC (Plane Paper Copier). At least a base layer of the belt comprises a modified polyamide imide resin formed by copolymerizing: (A) an aromatic isocyanate compound; (B) an aromatic polycarboxylic acid anhydride; and (C) a polymer having carboxylic acids at both terminals thereof.Type: ApplicationFiled: March 3, 2005Publication date: September 8, 2005Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Satoshi Suzuki, Yousuke Hayashi, Akihiko Kaji, Keisuke Tokoro, Tsukasa Fujita, Shigeki Kanda
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Publication number: 20040190949Abstract: A developing roll, which can reduce residual charge even under environment of low temperature and low humidity, comprises a shaft 1, an innermost layer 2, an intermediate layer 3 and an outermost layer 4 provided in this order on an outer peripheral surface of the shaft, the intermediate layer including an ionic conductive agent and carbon black and having a volume resistivity (&rgr;v) of not more than 1.0×106&OHgr;·cm and the outermost layer having a volume resistivity (&rgr;v) of 1.0×107 to 1.0×1013 &OHgr;·cm.Type: ApplicationFiled: March 30, 2004Publication date: September 30, 2004Applicant: TOKAI RUBBER INDUSTRIES, LTD.Inventors: Kazushi Yamaguchi, Mitsuyoshi Kondo, Akihiko Kaji, Yasuki Ohtake
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Publication number: 20040152575Abstract: A semi-conductive roll including a shaft, a low-hardness base layer formed on an outer circumferential surface of the shaft, and a coating layer formed by coating radially outwardly of the low-hardness base layer, wherein the coating layer is formed such that a rubber material or an elastomer material is crosslinked by at least one resin crosslinking agent.Type: ApplicationFiled: December 29, 2003Publication date: August 5, 2004Applicant: Tokai Rubber Industries, Ltd.Inventors: Akihiko Kaji, Motoharu Ishihara, Hirofumi Okuda, Yasuki Ohtake
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Patent number: 6196958Abstract: A toner supply roll including a cylindrical soft polyurethane sponge structure which is integrally formed on a metal shaft and which has a hardness of not higher than 350 g, a network of cells, and a skin layer having openings which are open in its outer circumferential surface and which communicate with respective radially outermost ones of the cells located adjacent to the skin layer, wherein the openings have a size of 100-800 &mgr;m, and a total area percent of at least 20% of the total area of the outer circumferential surface of the skin layer, and the sponge structure has a plurality of helical protrusions formed on the outer circumferential surface of the skin layer so as to extend helically about an axis of the sponge structure, the helical protrusions being arranged in a circumferential direction of the sponge structure, so as to form a plurality of helical recesses each interposed between adjacent ones of the helical protrusions, so that helical protrusions and recesses cooperate to define a tootheType: GrantFiled: May 18, 1999Date of Patent: March 6, 2001Assignee: Tokai Rubber Industries, Ltd.Inventors: Keita Shiraki, Akihiko Kaji
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Patent number: 6146320Abstract: A conductive roll available at low cost and superior both in moldability and compression set and having small dispersion or fluctuation in electrical resistance includes a shaft and a base rubber layer formed on a peripheral surface of the shaft, the base rubber layer formed of a composition containing the following components (A) to (C): (A) a liquid polymer having a structural unit (.alpha.) derived from at least one of butadiene and isoprene and having an alkenyl group in a side chain thereof; (B) a hydrosilylation crosslinking agent; and (C) a hydrosilylation catalyst. In the conductive roll the alkenyl group of the structural unit (.alpha.Type: GrantFiled: July 28, 1999Date of Patent: November 14, 2000Assignee: Tokai Rubber Industries, Ltd.Inventors: Hitoshi Yoshikawa, Shoji Arimura, Kunio Ito, Sumio Oinuma, Akihiko Kaji, Kenichi Ohkuwa, Kazuhiro Takeda, Satoshi Suzuki
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Patent number: 6142922Abstract: A conductive roll to be used as a developing roll, a charging roll, a transfer roll or the like in an electrophotographic apparatus such as a copying machine, a printer or a facsimile, of the present invention comprises a base rubber layer formed on a peripheral surface of a shaft, an intermediate layer formed on a peripheral surface of the base rubber layer, and a surface layer formed on a peripheral surface of the intermediate layer, the surface layer being composed of a resin composition comprising:(A) a silicone-grafted acrylic polymer which comprises repeating units represented by the following general formula (1), wherein an acrylic polymer portion of the silicone-grafted acrylic polymer exclusive of a structural portion derived from a siloxane has a glass-transition temperature of -35 to 30.degree. C.:--(Y).sub.k -- --(Z).sub.Type: GrantFiled: August 31, 1999Date of Patent: November 7, 2000Assignee: Tokai Rubber Industries, Ltd.Inventors: Hitoshi Yoshikawa, Shoji Arimura, Akihiko Kaji, Kenichi Ohkuwa
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Patent number: 5993366Abstract: A low hardness conductive roll, wherein an innermost layer is formed on the peripheral surface of a shaft body, an intermediate layer is formed on the peripheral surface thereof, and further an outermost layer is formed on the peripheral surface thereof, and wherein the outermost layer is formed of a resin composition comprising the following Component (A) so that good toner electrification property and toner releasability are achieved: ##STR1## wherein Y denotes a linear structural portion derived from an acrylic monomer, Z denotes a structural portion derived from an acrylic monomer and also has a structural portion derived from siloxane, and k and n denote positive numbers of 1 to 3,000, respectively.Type: GrantFiled: February 27, 1998Date of Patent: November 30, 1999Assignee: Tokai Rubber Industries, Ltd.Inventors: Akihiko Kaji, Kenichi Ohkuwa, Hitoshi Yoshikawa, Shoji Arimura