Patents by Inventor Hirotsugu Yoshida
Hirotsugu Yoshida 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: 20240128047Abstract: A sample inspection apparatus is provided. The invention is directed to a sample inspection apparatus 200 that includes an inspection means that is executed when a sample 11 is placed on a stage 8, the inspection means including the steps of (a) scanning a surface of the sample 11 with an electron beam EB1 with a probe 10a in contact with a conductor 11a and a probe 10b in contact with a conductor 11b, (b) measuring a differential value of a change in potential difference between the probes 10a and 10b while synchronizing with the scanning of the electron beam EB1, (c) acquiring a DI-EBAC image in which a fault spot 12 existing between the conductors 11a and 11b is shown as a bright part and a dark part based on the differential value of the change in the potential difference, and (d) specifying a direction of the fault spot 12 from the DI-EBAC image.Type: ApplicationFiled: April 13, 2021Publication date: April 18, 2024Inventors: Masahiro YOSHIDA, Junichi FUSE, Norio SATO, Hirotsugu KAJIYAMA
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Publication number: 20230151223Abstract: A pipe (10) includes a polyethylene-based resin layer (21) containing a polyethylene-based resin composition as a major component. The polyethylene-based resin layer (21) forms a pipeline member inner surface (10a). The polyethylene-based resin composition has a calcium concentration of 10 ppm or more and 60 ppm or less.Type: ApplicationFiled: March 9, 2021Publication date: May 18, 2023Applicants: SEKISUI CHEMICAL CO., LTD., JAPAN POLYETHYLENE CORPORATIONInventors: Tomoki YAMADA, Hirotsugu YOSHIDA, Hirotaka TAKANO, Tetsuya YOSHIKIYO, Tomoki HIRAMOTO
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Patent number: 8945669Abstract: The invention provides an extrusion material supply device suitable for use in melt extrusion molding, and a method for manufacturing an optical transmission body, in which a deterioration of an optical signal transmission loss is extremely small, and productivity intrinsic to an extrusion molding method is provided in combination. An extrusion material supply device 1 includes: a vertical hopper 2, which has a cooling unit 3 and a heat melting unit 4 continuous with a lower portion thereof, and houses a material rod R; cooling means 5 for cooling the cooling unit 3; an electric heater 6 that heats the heat melting unit 4; and gas pressurizing means 7 for sequentially supplying molten plastics M to a metal die by a gas pressure. The heat melting unit 4 is formed into a cylinder shape in which an inner diameter is larger than an inner diameter of the cooling unit 3 arranged above, and enables the molten plastics M to spread in the heat melting unit 4.Type: GrantFiled: January 26, 2010Date of Patent: February 3, 2015Assignees: Sekisui Chemical Co., Ltd., Keio UniversityInventors: Tazuru Okamoto, Hirotsugu Yoshida, Yasuhiro Koike
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Patent number: 8617445Abstract: The present invention provides a process for producing an oriented thermoplastic polyester resin sheet which is excellent in tensile strength, tencile modulas and heat resistance, and a light laminate-molded body using the same, which has a low linear expansion coefficient and is excellent in impact resistance, durability, easiness of handling, productivity, and others. A process for producing an oriented thermoplastic polyester resin sheet, which includes: pultrusion-drawing a thermoplastic polyester resin sheet in an amorphous state at a temperature from the glass transition temperature of the thermoplastic polyester resin ?20° C. to the glass transition temperature of the thermoplastic polyester resin +20° C.; and then drawing the resultant uniaxially at a temperature higher than the temperature for the pultrusion-drawing. A laminate-molded body, wherein a thermoplastic resin layer is laminated on each of the surfaces of the resultant oriented thermoplastic polyester resin sheet.Type: GrantFiled: February 17, 2006Date of Patent: December 31, 2013Assignee: Sekisui Chemical Co., Ltd.Inventors: Shigeru Ogasawara, Hirotsugu Yoshida, Hisashi Eguchi, Ryuichi Matsuo
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Patent number: 8611714Abstract: [Object] The present invention has the object of providing an optical fiber enabling high-speed communication, that exhibits superior transparency and excellent flexibility, and that includes trichloroethyl methacrylate as a main component of the core portion monomer. [Means for Solving Problem] An optical fiber configured from a core portion and a cladding portion disposed on an outer periphery of the core portion, wherein the core portion is formed by a main constituent component of a polymer of monomers that include at least 70 wt % of trichloroethyl methacrylate (TCEMA), the cladding portion is formed by a main constituent component of a polymer of monomers which include at least 20 wt % of methyl methacrylate (MMA).Type: GrantFiled: July 5, 2010Date of Patent: December 17, 2013Assignees: Sekisui Chemical Co., Ltd., Keio UniversityInventors: Hirotsugu Yoshida, Ryosuke Nakao, Hiroka Inabe, Tazuru Okamoto, Yuki Masabe, Masato Aoyama, Yasuhiro Koike
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Patent number: 8600210Abstract: A GI type optical fiber of the present invention is a GI type optical fiber having a core component and a cladding component disposed around the outer periphery of the core component, the core component includes a polymer containing at least 55 wt % chlorostyrene monomer and a dopant, and the cladding component includes a polymer of a monomer containing at least 35 wt % methyl methacrylate. It is an object of the present invention to provide a GI type optical fiber in which chlorostyrene is used as the predominant component of the monomer that constitutes the core component, and therefore has excellent transparency and good flexibility, and allows high-speed communication.Type: GrantFiled: February 4, 2010Date of Patent: December 3, 2013Assignees: Sekisui Chemical Co., Ltd., Keio UniversityInventors: Hirotsugu Yoshida, Tazuru Okamoto, Ryosuke Nakao, Hiroka Inabe, Yuki Masabe, Yasuhiro Koike
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Publication number: 20120114291Abstract: [Object] The present invention has the object of providing an optical fiber enabling high-speed communication, that exhibits superior transparency and excellent flexibility, and that includes trichloroethyl methacrylate as a main component of the core portion monomer. [Means for Solving Problem] An optical fiber configured from a core portion and a cladding portion disposed on an outer periphery of the core portion, wherein the core portion is formed by a main constituent component of a polymer of monomers that include at least 70 wt % of trichloroethyl methacrylate (TCEMA), the cladding portion is formed by a main constituent component of a polymer of monomers which include at least 20 wt % of methyl methacrylate (MMA).Type: ApplicationFiled: July 5, 2010Publication date: May 10, 2012Inventors: Hirotsugu Yoshida, Ryosuke Nakao, Hiroka Inabe, Tazuru Okamoto, Yuki Masabe, Masato Aoyama, Yasuhiro Koike
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Publication number: 20120034374Abstract: The invention provides an extrusion material supply device suitable for use in melt extrusion molding, and a method for manufacturing an optical transmission body, in which a deterioration of an optical signal transmission loss is extremely small, and productivity intrinsic to an extrusion molding method is provided in combination. An extrusion material supply device 1 includes: a vertical hopper 2, which has a cooling unit 3 and a heat melting unit 4 continuous with a lower portion thereof, and houses a material rod R; cooling means 5 for cooling the cooling unit 3; an electric heater 6 that heats the heat melting unit 4; and gas pressurizing means 7 for sequentially supplying molten plastics M to a metal die by a gas pressure. The heat melting unit 4 is formed into a cylinder shape in which an inner diameter is larger than an inner diameter of the cooling unit 3 arranged above, and enables the molten plastics M to spread in the heat melting unit 4.Type: ApplicationFiled: January 26, 2010Publication date: February 9, 2012Applicants: KEIO UNIVERSITY, SEKISUI CHEMICAL CO., LTD.Inventors: Tazuru Okamoto, Hirotsugu Yoshida, Yasuhiro Koike
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Publication number: 20120027369Abstract: A GI type optical fiber of the present invention is a GI type optical fiber having a core component and a cladding component disposed around the outer periphery of the core component, the core component includes a polymer containing at least 55 wt % chlorostyrene monomer and a dopant, and the cladding component includes a polymer of a monomer containing at least 35 wt % methyl methacrylate. It is an object of the present invention to provide a GI type optical fiber in which chlorostyrene is used as the predominant component of the monomer that constitutes the core component, and therefore has excellent transparency and good flexibility, and allows high-speed communication.Type: ApplicationFiled: February 4, 2010Publication date: February 2, 2012Inventors: Hirotsugu Yoshida, Tazuru Okamoto, Ryosuke Nakao, Hiroka Inabe, Yuki Masabe, Yasuhiro Koike
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Publication number: 20080182472Abstract: The present invention provides a process for producing an oriented thermoplastic polyester resin sheet which is excellent in tensile strength, tencile modulas and heat resistance, and a light laminate-molded body using the same, which has a low linear expansion coefficient and is excellent in impact resistance, durability, easiness of handling, productivity, and others. A process for producing an oriented thermoplastic polyester resin sheet, which includes: pultrusion-drawing a thermoplastic polyester resin sheet in an amorphous state at a temperature from the glass transition temperature of the thermoplastic polyester resin?20° C. to the glass transition temperature of the thermoplastic polyester resin+20° C.; and then drawing the resultant uniaxially at a temperature higher than the temperature for the pultrusion-drawing. A laminate-molded body, wherein a thermoplastic resin layer is laminated on each of the surfaces of the resultant oriented thermoplastic polyester resin sheet.Type: ApplicationFiled: February 17, 2006Publication date: July 31, 2008Inventors: Shigeru Ogasawara, Hirotsugu Yoshida, Hisashi Eguchi, Ryuichi Matsuo
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Patent number: 4831055Abstract: Compounds of formula (I) ##STR1## or a pharmaceutically acceptable salt thereof, wherein R.sup.1 is hydrogen, halogen or alkyl and R.sup.2 is hydrogen or alkyl are useful to reduce serum lipids in animals, including humans.Type: GrantFiled: June 8, 1987Date of Patent: May 16, 1989Assignee: Nippon Shinyaku Co., Ltd.Inventors: Yoshiaki Yoshikuni, Shoichi Chokai, Takayuki Ozaki, Hirotsugu Yoshida, Haruo Tanaka, Jun Segawa