Patents by Inventor Seiji Ohta
Seiji Ohta 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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Publication number: 20240085832Abstract: The present invention provides a fixing device including a flexible cylindrical rotary member and an inner-surface opposing portion that opposes an inner surface of the rotary member at an end portion of the rotary member in a generatrix direction. The inner-surface opposing portion moves upstream in a recording material conveying direction in accordance with lateral shift of the rotary member in the generatrix direction. This restricts the lateral shift of the rotary member.Type: ApplicationFiled: November 21, 2023Publication date: March 14, 2024Inventors: Hideki Ohta, Terutaka Endo, Seiji Obata, Jiro Moriya, Takayuki Mizuta
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Publication number: 20020016416Abstract: Ethylene/&agr;-olefin copolymer with olefin type elastomer, each having particular properties, including density and melt flow rate, with a density ratio of elastomer to copolymer of less than 1, provide compositions which have excellent moldability and form films having high mechanical strength.Type: ApplicationFiled: August 15, 2001Publication date: February 7, 2002Inventors: Mamoru Takahashi, Seiichi Ikeyama, Akira Todo, Toshiyuki Tsutsui, Seiji Ohta, Hajime Inagaki
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Patent number: 6333387Abstract: Ethylene/&agr;-olefin copolymer with olefin type elastomer, each having particular properties, including density and melt flow rate, with a density ratio of elastomer to copolymer of less than 1, provide compostions which have excellent moldability and form films having high mechanical strength.Type: GrantFiled: November 2, 2000Date of Patent: December 25, 2001Assignee: Mitsui Chemicals Inc.Inventors: Mamoru Takahashi, Seiichi Ikeyama, Akira Todo, Toshiyuki Tsutsui, Seiji Ohta, Hajime Inagaki
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Patent number: 6303713Abstract: A graft modified ethylene/&agr;-olefin copolymer obtained by graft polymerizing an ethylene/&agr;-olefin of 3 to 20 carbon atoms copolymerizing with a polar monomer in the presence of a catalyst for olefin polymerization comprising an organoaluminum oxy-compound (a) and at least two kinds of transition metal compounds (b). This ethylene/&agr;-olefin copolymer has high melt tension and high flowability. An ethylene copolymer composition comprising the above-mentioned graft modified ethylene/&agr;-olefin copolymer and polyolefin. The graft modified ethylene/&agr;-olefin copolymer of the invention is excellent in heat stability and moldability. From this copolymer, a film having a high transparency and good adhesion to highly polar materials can be produced. The ethylene copolymer composition of the invention is excellent in heat stability and moldability. From this composition, a film having high transparency and good adhesion to highly polar materials can be produced.Type: GrantFiled: August 20, 1999Date of Patent: October 16, 2001Assignee: Mitsui Chemicals INCInventors: Toshiyuki Tsutsui, Ken Yoshitsugu, Mamoru Takahashi, Akira Todo, Seiji Ohta, Hajime Inagaki
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Patent number: 6184297Abstract: An ethylene copolymer composition comprising an ethylene/&agr;-olefin copolymer [A1] obtained by using a catalyst for olefin polymerization containing an organoaluminum oxy-compound (a) and at least two kinds of specific metallocene compounds (b), and one (co)polymer selected from the group consisting of [B1] a low-density polyethylene obtained by high-pressure radical polymerization, [B2] a crystalline polyolefin and [B3] an olefin type elastomer. An ethylene copolymer composition comprising an ethylene/&agr;-olefin copolymer [A2] having specific properties, and one (co)polymer selected from the group consisting of [B1] a low-density polyethylene obtained by high-pressure radical polymerization, [B2] a crystalline polyolefin and [B3] an olefin type elastomer.Type: GrantFiled: February 12, 1997Date of Patent: February 6, 2001Assignee: Mitsui Chemicals IncInventors: Mamoru Takahashi, Seiichi Ikeyama, Akira Todo, Toshiyuki Tsutsui, Seiji Ohta, Hajime Inagaki
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Patent number: 6001941Abstract: An ethylene/.alpha.-olefin copolymer obtained by copolymerizing ethylene with an .alpha.-olefin of 3 to 20 carbon atoms in the presence of a catalyst for olefin polymerization comprising an organoaluminum oxy-compound (a) and at least two kinds of transition metal compounds (b). This ethylene/.alpha.-olefin copolymer has high melt tension and high flowability. A graft modified ethylene/.alpha.-olefin copolymer obtained by graft polymerizing the above-mentioned ethylene/.alpha.-olefin copolymer with a polar monomer. An ethylene copolymer composition comprising the above-mentioned graft modified ethylene/.alpha.-olefin copolymer and polyolefin. The ethylene/.alpha.-olefin copolymer of the invention is excellent in moldability. From this copolymer, a film having high transparency and high mechanical strength can be produced. The graft modified ethylene/.alpha.-olefin copolymer of the invention is excellent in heat stability and moldability.Type: GrantFiled: June 5, 1995Date of Patent: December 14, 1999Assignee: Mitsui Chemicals, Inc.Inventors: Toshiyuki Tsutsui, Ken Yoshitsugu, Mamoru Takahashi, Akira Todo, Seiji Ohta, Hajime Inagaki
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Patent number: 5834557Abstract: An ethylene/.alpha.-olefin copolymer composition including (I) a graft-modified ethylene/.alpha.-olefin copolymer composition and (II) a polyolefin. The graft-modified composition is prepared by graft copolymerizing an ethylene/.alpha.-olefin copolymer with a polar monomer. The ethylene/.alpha.-olefin copolymer composition includes first and second ethylene/.alpha.-olefin copolymers. The copolymers are each prepared in the presence of a polymerization catalyst containing (a) an organoaluminum oxy compound and (b) for the first ethylene/.alpha.-olefin copolymer at least two kinds, and for the second ethylene/.alpha.-olefin copolymer one kind, of compounds of Group IV transition metals of the periodic table containing a ligand having a cyclopentadienyl skeleton. The graft-modified ethylene/.alpha.-olefin copolymer composition is blended with a polyolefin, such as by mechanical or solution blending, at a weight ratio (I) to (II) of 1:99 to 99:1.Type: GrantFiled: June 11, 1997Date of Patent: November 10, 1998Assignee: Mitsui Chemicals, Inc.Inventors: Toshiyuki Tsutsui, Ken Yoshitsugu, Mamoru Takahashi, Akira Todo, Seiji Ohta, Hajime Inagaki
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Patent number: 5708080Abstract: A graft-modified ethylene/.alpha.-olefin copolymer composition is prepared by graft copolymerizing an ethylene/.alpha.-olefin copolymer. The ethylene/.alpha.-olefin copolymer composition includes first and second ethylene/.alpha.-olefin copolymers. The copolymers are each prepared in the presence of a polymerization catalyst containing (a) an organoaluminum oxy compound and (b) for the first ethylene/.alpha.-olefin copolymer at least two kinds, and for the second ethylene/.alpha.-olefin copolymer one kind, of compounds of Group IV transition metals of the periodic table containing a ligand having a cyclopentadienyl skeleton. The ethylene/.alpha.-olefin copolymer composition may be blended with a polyolefin by mechanical or solution blending. The copolymer compositions have excellent moldability and heat stability properties and forms films having high transparency and mechanical strength.Type: GrantFiled: May 25, 1995Date of Patent: January 13, 1998Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Toshiyuki Tsutsui, Ken Yoshitsugu, Mamoru Takahashi, Akira Todo, Seiji Ohta, Hajime Inagaki
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Patent number: 5566006Abstract: In an image reading apparatus, a first object and a second object are adapted to be illuminated on different regions each other with a light beam from a light source by an illuminating device. A first imaging optical system is provided to image image information of the first object on a single photoelectric converting device. A second imaging optical system is provided in an optical path different from that of the first imaging optical system so as to image image information of the second object onto the photoelectric converting device. The first and second object to be illuminated, and the photoelectric converting device are relatively displaced to read the image information of the first and second objects.Type: GrantFiled: July 6, 1994Date of Patent: October 15, 1996Assignee: Canon Kabushiki KaishaInventors: Kenji Yoshinaga, Akimitu Hoshi, Motomu Fukasawa, Koji Kimura, Seiji Ohta
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Patent number: 5464905Abstract: An ethylene/.alpha.-olefin copolymer composition containing a first and second ethylene/.alpha.-olefin copolymer is disclosed. The first ethylene/.alpha.-olefin copolymer is prepared in the prsence of a polymerization catalyst containing an organoaluminum oxy compound and at least two kinds of metallocene compounds (b) and the second ethylene/.alpha.-olefin copolymer, which differs from the first in at least one physical property, is prepared in the presence of a polymerization catalyst containing an organoaluminum oxy compound and a metallocene compound (b'). The ethylene/.alpha.-olefin copolymer composition has excellent moldability and heat stability properties and forms films having high transparency and mechanical strength.Type: GrantFiled: November 18, 1993Date of Patent: November 7, 1995Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Toshiyuki Tsutsui, Ken Yoshitsugu, Mamoru Takahashi, Akira Todo, Seiji Ohta, Hajime Inagaki
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Patent number: 5407773Abstract: A thermal fixing-type developer material for electrophotography comprising a propylene-.alpha.-olefin copolymer wax (A) having a number average molecular weight (Mn) in the range of from 7,000 to 12,000; a binder (B); and a colorant (C).There is provided a thermal fixing-type developer material for electrophotography which, when used as a main component for an electrostatic toner, would provide a reprographic image which exhibits good release properties upon thermal fixing, a reduced adhesion to the heated roller or the photoreceptor, no offset or contamination, and a good fixing of the fixed image, and prevent the heated roll and the photoreceptor from undergoing contamination.Type: GrantFiled: October 15, 1993Date of Patent: April 18, 1995Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Harumi Furuta, Seiji Ohta, Hajime Inagaki, Mituhiko Onda, Toshinobu Abiru