Patents by Inventor Masahiko Ishikawa
Masahiko Ishikawa 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: 20240012353Abstract: Provided is an image forming apparatus including a toner, and a fixing device configured to fix an image formed with the toner on a recording medium. The fixing device includes a fixing belt that is an endless belt, and a planar member configured to heat the fixing belt. An environmental fluctuation rate X is 45% or greater but 85% or less, and the environmental fluctuation rate X is represented by: Environmental fluctuation rate X=(Q1?Q2)/{(Q1+Q2)/2} where Q1 is a quantity of electric charge of the toner in an environment having a temperature of 10 degrees Celsius and relative humidity of 15%, Q2 is a quantity of electric charge of the toner in an environment having a temperature of 27 degrees Celsius and relative humidity of 80%, and a unit for Q1 and Q2 is ?C/g.Type: ApplicationFiled: December 23, 2021Publication date: January 11, 2024Applicant: Ricoh Company, Ltd.Inventors: Yuusuke FURUICHI, Takamasa HASE, Hiroshi SEO, Hideki SUGIURA, Maiko KOEDA, Masahiko ISHIKAWA
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Patent number: 11499062Abstract: An ink contains at least one kind of polyether-modified siloxane compound and at least one kind of aliphatic alcohol alkylene oxide compound.Type: GrantFiled: June 27, 2018Date of Patent: November 15, 2022Assignee: Ricoh Company, Ltd.Inventors: Hiroshi Gotou, Yoshiaki Masuda, Masahiko Ishikawa, Masaki Kudo, Kazuhiko Umemura, Keita Katoh, Akihiko Matsuyama, Masayasu Nonogaki, Takeshi Shibuya
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Patent number: 11181709Abstract: Provided is a manufacturing method of an optical fiber ribbon for manufacturing an intermittent-connection-type optical fiber ribbon including a connection part and a non-connection part. The manufacturing method includes: a release agent applying process of intermittently applying a release agent for preventing optical fibers from being bonded to each other with a connection resin in a longitudinal direction of the optical fibers in a state where the optical fibers are arranged in parallel; and a connection resin applying process of allowing the optical fibers in the state of being arranged in parallel to pass through a die for applying the connection resin around the optical fibers after the release agent applying process, and of curing the connection resin.Type: GrantFiled: January 17, 2019Date of Patent: November 23, 2021Assignee: SSUMITOMOM ELECTRIC INDUSTRIES, LTD.Inventors: Fumiaki Sato, Shigeru Suemori, Hiroki Ishikawa, Masahiko Ishikawa, Fumikazu Yoshizawa
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Publication number: 20210294229Abstract: An image forming apparatus includes a developing device accommodating toner, the toner containing: a binder resin; and a coloring agent; and a fixing device configured to fix a toner image formed with the toner on a recording medium, the fixing device comprising: a tubular belt member; a heating member configured to heat the tubular belt member directly or indirectly in contact with the tubular belt member; and a pressing member in contact with the tubular belt member, wherein the toner under a load of 2 kg has a flow index Tf of from 70 to 121 degrees C., a flow index Te of from 83 to 120 degrees C., and a softening index Tw of from 65 to 80 degrees C.Type: ApplicationFiled: March 17, 2021Publication date: September 23, 2021Inventors: Hideki SUGIURA, Maiko KOEDA, Masahiko ISHIKAWA, Hiroshi SEO, Yuusuke FURUICHI, Takamasa HASE
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Publication number: 20200409006Abstract: Provided is a manufacturing method of an optical fiber ribbon for manufacturing an intermittent-connection-type optical fiber ribbon including a connection part and a non-connection part. The manufacturing method includes: a release agent applying process of intermittently applying a release agent for preventing optical fibers from being bonded to each other with a connection resin in a longitudinal direction of the optical fibers in a state where the optical fibers are arranged in parallel; and a connection resin applying process of allowing the optical fibers in the state of being arranged in parallel to pass through a die for applying the connection resin around the optical fibers after the release agent applying process, and of curing the connection resin.Type: ApplicationFiled: January 17, 2019Publication date: December 31, 2020Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Fumiaki SATO, Shigeru SUEMORI, Hiroki ISHIKAWA, Masahiko ISHIKAWA, Fumikazu YOSHIZAWA
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Publication number: 20200157366Abstract: An ink contains at least one kind of polyether-modified siloxane compound and at least one kind of aliphatic alcohol alkylene oxide compound.Type: ApplicationFiled: June 27, 2018Publication date: May 21, 2020Inventors: Hiroshi GOTOU, Yoshiaki MASUDA, Masahiko ISHIKAWA, Masaki KUDO, Kazuhiko UMEMURA, Keita KATOH, Akihiko MATSUYAMA, Masayasu NONOGAKI, Takeshi SHIBUYA
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Publication number: 20190150858Abstract: An image display device includes: a controller that: acquires biological information of a subject measured by a sensor at a preset time interval; displays an image shot by a shooting device on a display; specifies a position of a figure image in the shot image; and detects a specified subject in a predetermined state. While detecting the specified subject, the controller acquires the biological information of the specified subject at a second time interval shorter than a first time interval which is the time interval in normal times. At the time of displaying the shot image including the figure image of the specified subject on the display, the controller displays information corresponding to the biological information of the specified subject acquired at the second time interval in a region corresponding to the specified position of the figure image of the specified subject while making the information overlap the figure image.Type: ApplicationFiled: December 26, 2016Publication date: May 23, 2019Applicant: Daiwa House Industry Co., Ltd.Inventors: Masahiko Ishikawa, Takashi Orime, Yoshiho Negoro, Tsukasa Nakano, Yasuo Takahashi
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Patent number: 10286666Abstract: An ink discharge device is provided including an ink, an ink discharge head, and a circulator. The ink discharge head includes a nozzle, an individual liquid chamber communicated with the nozzle, a flow-in channel, and a flow-out channel. The circulator circulates the ink by letting the ink flow into the individual liquid chamber via the flow-in channel and flow out from the individual liquid chamber via the flow-out channel. A flow rate of the circulated ink is 0.10 to 1.50 times a maximum dischargeable rate of the ink discharge head. A dynamic surface tension A of the ink at 25° C. is 34.0 mN/m or less when measured by a maximum bubble pressure method at a surface lifetime of 15 msec, and the dynamic surface tension A and a static surface tension B of the ink at 25° C. satisfy the following relation: 10.0(%)?[(A?B)/(A+B)]×100?19.0(%).Type: GrantFiled: October 26, 2017Date of Patent: May 14, 2019Assignee: Ricoh Company, Ltd.Inventors: Masahiko Ishikawa, Hiroshi Gotou, Takahiro Yoshida, Yukio Otome
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Publication number: 20190121044Abstract: In a step of intermittently applying an adhesive resin, while rotating an adhesive resin conveying roller formed by alternately laminating a disk-like fiber roller installed in a pass line, a disk-like partition plate having a diameter larger than that of the fiber roller and including a gap portion for holding the adhesive resin in a part of the vicinity of a peripheral edge portion in a circumferential direction, the adhesive resin conveying roller is immersed in the adhesive resin, which is not cured, to hold the adhesive resin in the gap portion, and then the optical fibers are brought into contact with the partition plate such that the partition plate is sandwiched between the optical fibers in running, so as to intermittently apply the adhesive resin held in the gap portion to the optical fibers in a longitudinal direction.Type: ApplicationFiled: March 22, 2017Publication date: April 25, 2019Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Hiroki ISHIKAWA, Toshihisa SATO, Fumiaki SATO, Masahiko ISHIKAWA
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Patent number: 10266710Abstract: An ink includes a coloring material, one or more organic solvents, a resin particle including a structure unit having a carboxyl group and a structure unit having an alkoxysilyl group, and water. The one or more organic solvents includes at least one organic solvent having a solubility parameter of 8.96 to less than 11.8. The ink has a dynamic surface tension A of 34.0 mN/m or less for a surface life of 15 msec at 25 degrees C. according to maximum bubble pressure technique. The dynamic surface tension A and a static surface tension B of the ink at 25 degrees C. satisfy the following relation: 10.0 percent?[(A?B)/(A+B)]×100?19.0 percent.Type: GrantFiled: August 1, 2017Date of Patent: April 23, 2019Assignee: Ricoh Company, Ltd.Inventors: Hiroshi Gotou, Masahiko Ishikawa
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Patent number: 10190007Abstract: Provided is an ink containing a colorant, an organic solvent, and water, wherein the ink contains as the organic solvent, at least one kind of an organic solvent having a solubility parameter of greater than or equal to 9 but less than 11.8, wherein a content of the organic solvent having a solubility parameter of greater than or equal to 9 but less than 11.8 is greater than or equal to 20% by mass of a total amount of the ink, wherein a dynamic surface tension A of the ink at 25° C. at a surface lifetime, measured by a maximum foaming pressure method, of 15 msec is less than or equal to 34.0 mN/m, and wherein the dynamic surface tension A and a static surface tension B of the ink at 25° C. satisfy a formula of 10.0%?[(A?B)/(A+B)]×100?19.0%.Type: GrantFiled: May 9, 2016Date of Patent: January 29, 2019Assignee: Ricoh Company, Ltd.Inventors: Hiroshi Gotou, Masahiko Ishikawa
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Patent number: 10151991Abstract: Provided is a toner including at least: a binder resin; and a release agent, wherein in a transmission electron microscopic (TEM) image of a torn cross-section of the toner, the release agent has an acicular or filiform shape and an average aspect ratio of 31 or greater, and wherein a displacement amount of the toner when 250 micronewtons is applied to the toner in a microcompression test is 700 nm or less.Type: GrantFiled: August 14, 2017Date of Patent: December 11, 2018Assignee: Ricoh Company, Ltd.Inventors: Satoshi Kojima, Yoshihiro Moriya, Masahiko Ishikawa, Satoshi Takahashi, Tatsuru Moritani, Tatsuki Yamaguchi
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Patent number: 10113078Abstract: An ink discharge device including an ink, an ink discharge head, and a negative pressure generator is provided. The ink comprises water, a colorant, an organic solvent X having a solubility parameter of from 8.9 to 12.0 and comprising no glycol ether compound, and a copolymer comprising a structural unit represented by the following formula (1): where R1 represents a hydrogen atom or methyl group and Y represents an alkylene group having 2 to 18 carbon atoms. The ink discharge head includes a nozzle to discharge the ink, a plurality of individual liquid chambers in communication with the nozzle, a flow-in channel to let the ink flow into the individual liquid chambers, and a flow-out channel to let the ink flow out from the individual liquid chambers. The negative pressure generator is configured to generate a negative pressure that lets the ink flow out from the individual liquid chambers.Type: GrantFiled: October 13, 2017Date of Patent: October 30, 2018Assignee: Ricoh Company, Ltd.Inventors: Keita Katoh, Hiroshi Gotou, Takahiro Yoshida, Akihiko Matsuyama, Masahiko Ishikawa, Yoshiki Yanagawa
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Patent number: 9971261Abstract: An electrostatic-image developing toner including at least a binder resin; a colorant; and a release agent, wherein an average circularity of particles having a particle diameter in a range of 0.79 times or more but less than 1.15 times as large as a most frequent diameter in a number particle size distribution of the toner is within a range of 1.010 times or more but less than 1.020 times as high as an average circularity of particles having a particle diameter of 1.15 times or more as large as the most frequent diameter.Type: GrantFiled: February 2, 2017Date of Patent: May 15, 2018Assignee: Ricoh Company, Ltd.Inventors: Satoshi Takahashi, Yoshihiro Moriya, Ryota Inoue, Masahiko Ishikawa, Tatsuki Yamaguchi, Satoshi Kojima
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Publication number: 20180126731Abstract: An ink discharge device is provided including an ink, an ink discharge head, and a circulator. The ink discharge head includes a nozzle, an individual liquid chamber communicated with the nozzle, a flow-in channel, and a flow-out channel. The circulator circulates the ink by letting the ink flow into the individual liquid chamber via the flow-in channel and flow out from the individual liquid chamber via the flow-out channel. A flow rate of the circulated ink is 0.10 to 1.50 times a maximum dischargeable rate of the ink discharge head. A dynamic surface tension A of the ink at 25° C. is 34.0 mN/m or less when measured by a maximum bubble pressure method at a surface lifetime of 15 msec, and the dynamic surface tension A and a static surface tension B of the ink at 25° C. satisfy the following relation: 10.0(%)?[(A?B)/(A+B)]×100?19.0(%).Type: ApplicationFiled: October 26, 2017Publication date: May 10, 2018Inventors: Masahiko ISHIKAWA, Hiroshi Gotou, Takahiro Yoshida, Yukio Otome
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Publication number: 20180105711Abstract: An ink discharge device including an ink, an ink discharge head, and a negative pressure generator is provided. The ink comprises water, a colorant, an organic solvent X having a solubility parameter of from 8.9 to 12.0 and comprising no glycol ether compound, and a copolymer comprising a structural unit represented by the following formula (1): where R1 represents a hydrogen atom or methyl group and Y represents an alkylene group having 2 to 18 carbon atoms. The ink discharge head includes a nozzle to discharge the ink, a plurality of individual liquid chambers in communication with the nozzle, a flow-in channel to let the ink flow into the individual liquid chambers, and a flow-out channel to let the ink flow out from the individual liquid chambers. The negative pressure generator is configured to generate a negative pressure that lets the ink flow out from the individual liquid chambers.Type: ApplicationFiled: October 13, 2017Publication date: April 19, 2018Inventors: Keita KATOH, Hiroshi Gotou, Takahiro Yoshida, Akihiko Matsuyama, Masahiko Ishikawa, Yoshiki Yanagawa
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Publication number: 20180030292Abstract: An ink includes a coloring material, one or more organic solvents, a resin particle including a structure unit having a carboxyl group and a structure unit having an alkoxysilyl group, and water. The one or more organic solvents includes at least one organic solvent having a solubility parameter of 8.96 to less than 11.8. The ink has a dynamic surface tension A of 34.0 mN/m or less for a surface life of 15 msec at 25 degrees C. according to maximum bubble pressure technique. The dynamic surface tension A and a static surface tension B of the ink at 25 degrees C. satisfy the following relation: 10.0 percent?[(A?B)/(A+B)×100?19.0 percent.Type: ApplicationFiled: August 1, 2017Publication date: February 1, 2018Inventors: Hiroshi GOTOU, Masahiko Ishikawa
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Publication number: 20170343912Abstract: Provided is a toner including at least: a binder resin; and a release agent, wherein in a transmission electron microscopic (TEM) image of a torn cross-section of the toner, the release agent has an acicular or filiform shape and an average aspect ratio of 31 or greater, and wherein a displacement amount of the toner when 250 micronewtons is applied to the toner in a microcompression test is 700 nm or less.Type: ApplicationFiled: August 14, 2017Publication date: November 30, 2017Inventors: Satoshi KOJIMA, Yoshihiro MORIYA, Masahiko ISHIKAWA, Satoshi TAKAHASHI, Tatsuru MORITANI, Tatsuki YAMAGUCHI
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Patent number: 9785065Abstract: A toner including: binder resin; and release agent, wherein the release agent is 1% to 8% by mass to the toner, as equivalent mass of endothermic amount of the release agent determined by DSC, wherein the release agent present in region from surface of the toner to 0.3 ?m depth is 0.1% to 4% by mass, as determined by FTIR-ATR, and wherein, in TEM image of torn surface of the toner, WDa<WDb<WDc is satisfied, WDa denoting number-average-particle-diameter of the release agent in region Aa that is from surface of the toner to depth that is one-sixth of diameter d of the toner (?d), WDc denoting number-average-particle-diameter of the release agent in central region Ac that is circular region having center located at center of the toner and radius of ?d, WDb denoting number-average-particle-diameter of the release agent in region Ab that is other than region Aa or Ac.Type: GrantFiled: March 24, 2015Date of Patent: October 10, 2017Assignee: Ricoh Company, Ltd.Inventors: Ryota Inoue, Yoshihiro Moriya, Masahiko Ishikawa, Satoshi Takahashi, Tatsuki Yamaguchi, Satoshi Kojima
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Publication number: 20170212437Abstract: A toner including: binder resin; and release agent, wherein the release agent is 1% to 8% by mass to the toner, as equivalent mass of endothermic amount of the release agent determined by DSC, wherein the release agent present in region from surface of the toner to 0.3 ?m depth is 0.1% to 4% by mass, as determined by FTIR-ATR, and wherein, in TEM image of torn surface of the toner, WDa<WDb<WDc is satisfied, WDa denoting number-average-particle-diameter of the release agent in region Aa that is from surface of the toner to depth that is one-sixth of diameter d of the toner (?d), WDc denoting number-average-particle-diameter of the release agent in central region Ac that is circular region having center located at center of the toner and radius of ?d, WDb denoting number-average-particle-diameter of the release agent in region Ab that is other than region Aa or Ac.Type: ApplicationFiled: March 24, 2015Publication date: July 27, 2017Inventors: Ryota INOUE, Yoshihiro MORIYA, Masahiko ISHIKAWA, Satoshi TAKAHASHI, Tatsuki YAMAGUCHI, Satoshi KOJIMA