Patents by Inventor Shigeto Matsumoto
Shigeto Matsumoto 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: 20240017543Abstract: In a head body, a head controller inputs individual signals to multiple recording elements that form dots. The individual signals each include a non-waveform signal and a driving waveform signal. The non-waveform signal is input to the recording element during non-driving and the potential thereof is held at a standby potential. The driving waveform signal is input to the recording element during driving, and the potential thereof transitions from the standby potential to one or more displacement potentials. The standby potential of the non-waveform signal input to at least one of the multiple recording elements is different from the standby potential of the non-waveform signal input to at least another one of the multiple recording elements.Type: ApplicationFiled: November 24, 2021Publication date: January 18, 2024Inventor: Shigeto MATSUMOTO
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Patent number: 11753328Abstract: A method for screening an optical fiber core including a resin coating layer, includes: a pre-strain applying step of adding a tensile force while feeding a portion of the optical fiber core retained at both ends of the portion, and applying a pre-tensile strain larger than zero and smaller than a guaranteed tensile strain set as a guaranteed value; a guaranteed strain applying step of adding a tensile force while feeding the portion of the optical fiber core retained at both ends of the portion and applied with the pre-tensile strain, and applying the guaranteed tensile strain only for a predetermined time; and a guaranteed strain releasing step of releasing the optical fiber core from the guaranteed tensile strain.Type: GrantFiled: June 8, 2020Date of Patent: September 12, 2023Assignee: FURUKAWA ELECTRIC CO., LTD.Inventors: Shinichi Arai, Shigeto Matsumoto
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Patent number: 11237322Abstract: An optical fiber manufacturing method includes setting a first holding member and a rod inside a glass pipe, the first holding member made of glass and having plural holes formed, so that the rod is supported by the first holding member; filling glass particles between the rod and a glass pipe inner wall; holding the rod such that the rod and the filled glass particles are enclosed by the glass pipe inner wall and the first and second holding members, and sealing one end of the glass pipe and manufacturing an intermediate; and manufacturing an optical fiber from the intermediate, wherein a bulk density of the first and second holding members is set with reference to a bulk density of a filling portion made from the glass particles, and the predetermined range is determined according to a core diameter permissible variation range in its longitudinal direction.Type: GrantFiled: September 16, 2019Date of Patent: February 1, 2022Assignees: FURUKAWA ELECTRIC CO., LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Shinichi Arai, Harumi Inaba, Shigeto Matsumoto, Takeshi Yagi, Shinichi Aozasa, Kyozo Tsujikawa, Kazuhide Nakajima
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Patent number: 11174577Abstract: A brushed circular knitted fabric has double loops stacked with at least two kinds of synthetic fiber multifilaments, wherein at least one surface of the circular knitted fabric has undergone brush processing, and the FT index represented by the equation (T2/T1) [T1: thickness (of one layer) according to a method prescribed by JIS, T2: thickness according to the same method prescribed by JIS at a state where the fabric is folded in two] is 2.1 or greater. The brushed circular knitted fabric has resiliency feeling and stretchability suitable for use in a coat or jacket, and is excellent in physical properties such as pilling resistance and changes in dimensions with washing.Type: GrantFiled: July 21, 2016Date of Patent: November 16, 2021Assignees: Mitsukawa & Co., Ltd., Toray Industries, Inc.Inventors: Shigeto Matsumoto, Hiroshi Tanaka, Masanobu Sato, Takashi Kawasaki
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Publication number: 20200299178Abstract: A method for screening an optical fiber core including a resin coating layer, includes: a pre-strain applying step of adding a tensile force while feeding a portion of the optical fiber core retained at both ends of the portion, and applying a pre-tensile strain larger than zero and smaller than a guaranteed tensile strain set as a guaranteed value; a guaranteed strain applying step of adding a tensile force while feeding the portion of the optical fiber core retained at both ends of the portion and applied with the pre-tensile strain, and applying the guaranteed tensile strain only for a predetermined time; and a guaranteed strain releasing step of releasing the optical fiber core from the guaranteed tensile strain.Type: ApplicationFiled: June 8, 2020Publication date: September 24, 2020Applicant: FURUKAWA ELECTRIC CO., LTD.Inventors: Shinichi ARAI, Shigeto MATSUMOTO
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Publication number: 20200012042Abstract: An optical fiber manufacturing method includes setting a first holding member and a rod inside a glass pipe, the first holding member made of glass and having plural holes formed, so that the rod is supported by the first holding member; filling glass particles between the rod and a glass pipe inner wall; holding the rod such that the rod and the filled glass particles are enclosed by the glass pipe inner wall and the first and second holding members, and sealing one end of the glass pipe and manufacturing an intermediate; and manufacturing an optical fiber from the intermediate, wherein a bulk density of the first and second holding members is set with reference to a bulk density of a filling portion made from the glass particles, and the predetermined range is determined according to a core diameter permissible variation range in its longitudinal direction.Type: ApplicationFiled: September 16, 2019Publication date: January 9, 2020Applicants: FURUKAWA ELECTRIC CO., LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Shinichi ARAI, Harumi Inaba, Shigeto Matsumoto, Takeshi Yagi, Shinichi Aozasa, Kyozo Tsujikawa, Kazuhide Nakajima
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Publication number: 20190177204Abstract: A manufacturing method for an optical fiber preform includes forming a porous material made of fine silica glass particles surrounding a plurality of glass rods; and sintering the porous material, wherein the forming the porous material includes forming the porous material such that two or more of the plurality of glass rods protrude from the porous material, and the sintering includes supporting end portions of protruding sides of the two or more protruding glass rods collectively with a support jig, and performing the sintering. With this, a reduction in manufacturing yield is suppressed.Type: ApplicationFiled: March 28, 2017Publication date: June 13, 2019Applicant: FURUKAWA ELECTRIC CO., LTD.Inventors: Shinichi ARAI, Takeshi YAGI, Shigeto MATSUMOTO
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Publication number: 20190003087Abstract: A brushed circular knitted fabric has double loops stacked with at least two kinds of synthetic fiber multifilaments, wherein at least one surface of the circular knitted fabric has undergone brush processing, and the FT index represented by the equation (T2/T1) [T1: thickness (of one layer) according to a method prescribed by JIS, T2: thickness according to the same method prescribed by JIS at a state where the fabric is folded in two] is 2.1 or greater. The brushed circular knitted fabric has resiliency feeling and stretchability suitable for use in a coat or jacket, and is excellent in physical properties such as pilling resistance and changes in dimensions with washing.Type: ApplicationFiled: July 21, 2016Publication date: January 3, 2019Inventors: Shigeto Matsumoto, Hiroshi Tanaka, Masanobu Sato, Takashi Kawasaki
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Patent number: 9225141Abstract: A multi-core amplification optical fiber includes a plurality of rare-earth-doped core portions and a cladding portion positioned at an outer periphery of the core portions and having refractive index lower than those of the core portions. When a doping concentration of the rare-earth of each of the core portions is 250 ppm to 2000 ppm, a relative refractive index difference of each of the core portions relative to the cladding portion is 0.5% to 2% at a wavelength of 1550 nm, and a core diameter of each of the core portions is 1 ?m to 5 ?m, a separation distance between each of the core portions and adjacent one of the core portions is set at equal to or larger than 30 ?m and at equal to or smaller than 60 ?m so that a light-crosstalk between the adjacent core portions is equal to or lower than ?30 dB.Type: GrantFiled: April 4, 2014Date of Patent: December 29, 2015Assignee: FURUKAWA ELECTRIC CO., LTD.Inventors: Yukihiro Tsuchida, Koichi Maeda, Yu Mimura, Hiroshi Matsuura, Kengo Watanabe, Tsunetoshi Saito, Ryo Miyabe, Shigeto Matsumoto, Keiichi Aiso, Ryuichi Sugizaki
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Publication number: 20140240819Abstract: A multi-core amplification optical fiber includes a plurality of rare-earth-doped core portions and a cladding portion positioned at an outer periphery of the core portions and having refractive index lower than those of the core portions. When a doping concentration of the rare-earth of each of the core portions is 250 ppm to 2000 ppm, a relative refractive index difference of each of the core portions relative to the cladding portion is 0.5% to 2% at a wavelength of 1550 nm, and a core diameter of each of the core portions is 1 ?m to 5 ?m, a separation distance between each of the core portions and adjacent one of the core portions is set at equal to or larger than 30 ?m and at equal to or smaller than 60 ?m so that a light-crosstalk between the adjacent core portions is equal to or lower than ?30 dB.Type: ApplicationFiled: April 4, 2014Publication date: August 28, 2014Applicant: FURUKAWA ELECTRIC CO., LTD.Inventors: Yukihiro TSUCHIDA, Koichi Maeda, Yu Mimura, Hiroshi Matsuura, Kengo Watanabe, Tsunetoshi Saito, Ryo Miyabe, Shigeto Matsumoto, Keiichi Aiso, Ryuichi Sugizaki
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Patent number: 8537458Abstract: An optical fiber for optical amplification has: a core portion doped with at least erbium and aluminum; a cladding portion formed around the core portion and having a refractive index smaller than that of the core portion; a peak value of absorption coefficient of 35 dB/m or greater at a wavelength around 1530 nanometers; normal dispersion characteristics and an effective core area of 20 ?m2 or larger, at a wavelength of 1550 nanometers; and a power conversion efficiency of a conversion from pumping light to amplified light having a wavelength of 1550 nanometers is 30% or more.Type: GrantFiled: July 2, 2010Date of Patent: September 17, 2013Assignee: Furukawa Electric Co., Ltd.Inventors: Youko Yamanashi, Shigeto Matsumoto
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Patent number: 8113739Abstract: A sand drift prevention method in which a plurality of columnar sandbags made of a tubular knit fabric are placed so as to cross over one another, and in such a pitch that 3 to 30 sandbags are disposed for every ten meters, and in which the cross-sectional area of each of the columnar sandbags is 10 to 400 cm2. A method of forming and improving the vegetation in sandy soil in which drift of sand is prevented by the sand drift prevention method, a plant desired to grow is grown in the sandy soil surface exposed as being surrounded by columnar sandbags placed so as to cross over one another. A tubular knit fabric for a columnar sandbag employed in these methods, and, in particular, the tubular knit fabric knitted by use of a polylactic-acid fiber.Type: GrantFiled: April 25, 2008Date of Patent: February 14, 2012Assignees: Toray Industries, Inc., Mitsukawa & Co., Ltd.Inventors: Osamu Mito, Kazuya Matsumura, Koji Sasaki, Takenobu Okumura, Shigeto Matsumoto, Makoto Maeda
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Publication number: 20110007385Abstract: An optical fiber for optical amplification has: a core portion doped with at least erbium and aluminum; a cladding portion formed around the core portion and having a refractive index smaller than that of the core portion; a peak value of absorption coefficient of 35 dB/m or greater at a wavelength around 1530 nanometers; normal dispersion characteristics and an effective core area of 20 ?m2 or larger, at a wavelength of 1550 nanometers; and a power conversion efficiency of a conversion from pumping light to amplified light having a wavelength of 1550 nanometers is 30% or more.Type: ApplicationFiled: July 2, 2010Publication date: January 13, 2011Applicant: FURUKAWA ELECTRIC CO., LTD.Inventors: Youko YAMANASHI, Shigeto Matsumoto
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Publication number: 20080279630Abstract: A sand drift prevention method in which a plurality of columnar sandbags made of a tubular knit fabric are placed so as to cross over one another, and in such a pitch that 3 to 30 sandbags are disposed for every ten meters, and in which the cross-sectional area of each of the columnar sandbags is 10 to 400 cm2. A method of forming and improving the vegetation in sandy soil in which drift of sand is prevented by the sand drift prevention method, a plant desired to grow is grown in the sandy soil surface exposed as being surrounded by columnar sandbags placed so as to cross over one another. A tubular knit fabric for a columnar sandbag employed in these methods, and, in particular, the tubular knit fabric knitted by use of a polylactic-acid fiber.Type: ApplicationFiled: April 25, 2008Publication date: November 13, 2008Inventors: Osamu Mito, Kazuya Matsumura, Koji Sasaki, Takenobu Okumura, Shigeto Matsumoto, Makoto Maeda
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Patent number: 5232520Abstract: A high strength martensitic stainless steel having superior anti-fatigue characteristics when used in a corrosive or erosive environment. The steel has a proof strength of 80 to 110 kg/mm.sup.2 and a composition containing specified amounts of carbon, silicon, manganese, chromium, nickel, molybdenum, vanadium, and nitrogen, the balance being substantially iron and incidental inclusions. The contents of the additives are such that a nickel equivalent Nieq given by the following Formula (1) ranges between 10.5 and 12.9 wt. %:Nieq=[Ni]+[Mn]+0.5[Cr]+0.3 [Si]+[Mo] (1)where, [Ni], [Mn], [Cr], [Si], and [Mo], respectively represent the contents of Ni, Mn, Cr, Si, and Mo, respectively. The steel may also contain niobium or copper. The steel is produced by a process which includes a hot work and a subsequent cooling at a specific cooling rate to a specific temperature range.Type: GrantFiled: January 14, 1992Date of Patent: August 3, 1993Assignee: Kawasaki Steel CorporationInventors: Yutaka Oka, Shigeto Matsumoto, Kiyoshi Uchida
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Patent number: 4125193Abstract: A climbing device for a climbing crane wherein two upper supporting arms are supported vertically movably by a main cylinder having its upper end pivoted to the upper portion of a guide frame which in turn is intrusively attached to a mast, and two lower supporting arms are supported by the lower portion of the guide frame whereby climbing or descending is carried out by effectively taking advantage of the upper and lower supporting arms.Type: GrantFiled: October 11, 1977Date of Patent: November 14, 1978Assignee: Ishikawajima-Harima Jukogyo Kabushiki KaishaInventor: Shigeto Matsumoto