Patents by Inventor Masahiro Seki

Masahiro Seki 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).

  • Publication number: 20210355995
    Abstract: A sealing device is disposed between an inner member and an outer member that rotate relative to each other to seal a gap between the inner member and the outer member of the sealing device, and includes a first sealing member including a cylindrical part to be mounted to the outer member, and an annular part that extends radially inward from the cylindrical part toward the inner member; and a second sealing member including a sleeve to be mounted to the inner member, and a flange that extends radially outward from the sleeve, the flange facing the annular part of the first sealing member. The first sealing member includes at least three axial lips made from an elastic material that extends from the annular part toward the flange of the second sealing member. An axial lip disposed radially outer side has an interference that is greater than that of an axial lip disposed radially inner side.
    Type: Application
    Filed: November 5, 2019
    Publication date: November 18, 2021
    Applicant: NOK CORPORATION
    Inventors: Shintaro SUGAWARA, Masahiro SEKI, Yuichi TARUKAWA
  • Patent number: 11106150
    Abstract: A carrier for forming an electrophotographic image is provided. The carrier includes a core particle comprising a manganese-based ferrite particle having an apparent density of from 2.0 to 2.2 g/cm3 and a magnetization of from 44 to 52 emu/g in a magnetic field of 500 Oe; and a coating layer coating a surface of the core particle. The coating layer contains a carbon black, an inorganic particle A, and an inorganic particle B. The inorganic particle A and the carbon black each have a concentration gradient in a thickness direction of the coating layer. A concentration of the inorganic particle A increases toward a surface of the coating layer, and a concentration of the carbon black decreases toward the surface of the coating layer.
    Type: Grant
    Filed: November 14, 2019
    Date of Patent: August 31, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventors: Masashi Nagayama, Hiroyuki Kishida, Masahiro Seki, Yoshimichi Ishikawa, Saori Yamada
  • Patent number: 11031832
    Abstract: According to one embodiment, a stator includes spacing strips disposed to be interposed in the electromagnetic steel plates for each predetermined set of plates of the electromagnetic steel plates, each of the spacing strips extending in a radial direction of the stator iron core to form ventilation ducts, a spacing strip attachment plate which is disposed between the spacing strips and the set of plates of the electromagnetic steel plates to fix the spacing strips, and an insulating layer which covers the entirety of the spacing strip attachment plate and the spacing strips fixed to the spacing strip attachment plate.
    Type: Grant
    Filed: April 8, 2019
    Date of Patent: June 8, 2021
    Assignees: KABUSHIKI KAISHA TOSHIBA, Toshiba Energy Systems & Solutions Corporation
    Inventors: Shunsuke Ishizaki, Ken Nagakura, Yuichiro Gunji, Norio Takahashi, Masahiro Seki
  • Publication number: 20210116034
    Abstract: A sealing device disposed between inner and outer members that rotate relative to each other for sealing a gap between the inner and outer members, includes a first sealing member to be mounted on the outer member and a second sealing member to be mounted on the inner member. Water-discharging protrusions protrude in a space between the second sealing member and the first sealing member. The water-discharging protrusions are arranged in a circumferential direction. Each protrusion has an inclined side surface intersecting at an acute angle with a rotational direction in which at least one of the inner and outer members rotates. The first sealing member has an annular labyrinth lip protruding toward the flange part of the second sealing member and is not in contact with the second sealing member, the labyrinth lip overlapping the water-discharging protrusions in radial directions and being disposed radially inside the water-discharging protrusions.
    Type: Application
    Filed: August 9, 2019
    Publication date: April 22, 2021
    Applicant: NOK CORPORATION
    Inventors: Masahiro SEKI, Yuya SAKANO, Toshiki ISAWA
  • Publication number: 20200362967
    Abstract: A sealing device is located between an inner member and an outer member that rotate relative to each other. The sealing device includes a tubular part that is to be mounted on a cylindrical end portion of the outer member, an annular part connected to an end of the tubular part and having a portion located radially inside the end portion of the outer member, at least one lip extending from the annular part toward the inner member. Each of the annular part and the tubular part includes an elastic part and a rigid part. At least one of an upper surface of the annular part that is opposite to the tubular part and a lower surface of the tubular part that is opposite to the annular part is formed of the elastic part. Multiple protrusions are formed on at least one of the upper surface of the annular part and the lower surface of the tubular part, the protrusions protruding along an axial direction of the sealing device.
    Type: Application
    Filed: April 3, 2019
    Publication date: November 19, 2020
    Inventor: Masahiro SEKI
  • Publication number: 20200166867
    Abstract: A carrier for forming an electrophotographic image is provided. The carrier includes a core particle comprising a manganese-based ferrite particle having an apparent density of from 2.0 to 2.2 g/cm3 and a magnetization of from 44 to 52 emu/g in a magnetic field of 500 Oe; and a coating layer coating a surface of the core particle. The coating layer contains a carbon black, an inorganic particle A, and an inorganic particle B. The inorganic particle A and the carbon black each have a concentration gradient in a thickness direction of the coating layer. A concentration of the inorganic particle A increases toward a surface of the coating layer, and a concentration of the carbon black decreases toward the surface of the coating layer.
    Type: Application
    Filed: November 14, 2019
    Publication date: May 28, 2020
    Inventors: Masashi NAGAYAMA, Hiroyuki KISHIDA, Masahiro SEKI, Yoshimichi ISHIKAWA, Saori YAMADA
  • Publication number: 20200028401
    Abstract: A rotary electric machine and a turbine system including a housing, and a hydrogen generator arranged into or on the housing. The hydrogen generator electrolytically generates hydrogen from water. The hydrogen generator supplies the hydrogen into the housing.
    Type: Application
    Filed: July 2, 2019
    Publication date: January 23, 2020
    Applicants: Kabushiki Kaisha Toshiba, Toshiba Energy Systems & Solutions Corporation
    Inventors: Tomoyuki Takahashi, Ken Nagakura, Hiroyuki Yoda, Daisuke Murata, Hiroshi Kawakami, Junichi Mori, Masahiro Seki
  • Patent number: 10474051
    Abstract: Provided is a carrier for a developer of an electrostatic latent image, the carrier including a core particle, and a resin layer covering the core particle, where the resin layer includes metal compound particles, wherein the metal compound particles include magnesium compound particles or barium compound particles, and an exposed amount B (atomic %) of the magnesium or the barium on a surface of the carrier particle satisfies a relationship below: 10.0?B ?1.2.
    Type: Grant
    Filed: September 14, 2018
    Date of Patent: November 12, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Mariko Takii, Koichi Sakata, Tohru Suganuma, Masahiro Seki, Masashi Nagayama, Shinya Nakagawa, Kei Niwayama
  • Patent number: 10444651
    Abstract: A carrier is provided including a core particle and a resin layer coating the surface of the core particle. The resin layer includes fine metal particles, and a detected metal element amount A obtained by X-ray photoelectron spectrometry of the surface of the carrier is in a range of 4.0 atomic %?A?20.0 atomic % and an average major-axis length B of the fine metal particle exposing from the resin layer is in a range of 100 nm?B?800 nm.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: October 15, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Mariko Takii, Koichi Sakata, Tohru Suganuma, Masahiro Seki, Masashi Nagayama, Toyoaki Tano, Kohsuke Miyazaki
  • Publication number: 20190312472
    Abstract: According to one embodiment, a stator includes spacing strips disposed to be interposed in the electromagnetic steel plates for each predetermined set of plates of the electromagnetic steel plates, each of the spacing strips extending in a radial direction of the stator iron core to form ventilation ducts, a spacing strip attachment plate which is disposed between the spacing strips and the set of plates of the electromagnetic steel plates to fix the spacing strips, and an insulating layer which covers the entirety of the spacing strip attachment plate and the spacing strips fixed to the spacing strip attachment plate.
    Type: Application
    Filed: April 8, 2019
    Publication date: October 10, 2019
    Applicants: KABUSHIKI KAISHA TOSHIBA, Toshiba Energy Systems & Solutions Corporation
    Inventors: Shunsuke ISHIZAKI, Ken NAGAKURA, Yuichiro GUNJI, Norio TAKAHASHI, Masahiro SEKI
  • Patent number: 10254674
    Abstract: A carrier for a developer of an electrostatic latent image, the carrier including: core particles having magnetism; and a coating layer coating a surface of each of the core particles, wherein the coating layer includes two or more kinds of inorganic particles, at least one kind of inorganic particles among the two or more kinds of inorganic particles is inorganic particles A having conductivity and a peak particle diameter of from 300 nm through 1,000 nm, and surface roughness of the carrier calculated by Formula 1 below is from 1.10 m2/g through 1.90 m2/g, C?F??Formula 1 where C is a BET specific surface area (m2/g) of the carrier and F is a BET specific surface area (m2/g) of the core particles.
    Type: Grant
    Filed: October 12, 2017
    Date of Patent: April 9, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Masahiro Seki, Hiroyuki Kishida, Haruki Murata, Shinya Nakagawa, Kei Niwayama, Saori Yamada, Kohsuke Miyazaki
  • Publication number: 20190018331
    Abstract: Provided is a carrier for a developer of an electrostatic latent image, the carrier including a core particle, and a resin layer covering the core particle, where the resin layer includes metal compound particles, wherein the metal compound particles include magnesium compound particles or barium compound particles, and an exposed amount B (atomic %) of the magnesium or the barium on a surface of the carrier particle satisfies a relationship below: 10.0?B?1.2.
    Type: Application
    Filed: September 14, 2018
    Publication date: January 17, 2019
    Inventors: Mariko Takii, Koichi Sakata, Tohru Suganuma, Masahiro Seki, Masashi Nagayama, Shinya Nakagawa, Kei Niwayama
  • Publication number: 20190011847
    Abstract: Provided is a toner including a binder resin, wherein the toner includes a THF-insoluble component in an amount of from 10% by mass through 40% by mass, a molecular weight distribution of a THF-soluble component of the toner measured by gel permeation chromatography (GPC) has a main peak between 10,000 and 16,000, and a half value width of the main peak is a molecular weight of from 60,000 through 90,000, and the THF-soluble component of the toner includes a component having a molecular weight of 2,000 or less in an amount of from 15.0% by mass through 25.0% by mass, and a component having a molecular weight of 100,000 or greater in an amount of 10.0% by mass or less as measured by GPC.
    Type: Application
    Filed: September 14, 2018
    Publication date: January 10, 2019
    Inventors: Satoshi OGAWA, Masahiro SEKI, Yoshitaka SEKIGUCHI, Tohru MORIYA
  • Publication number: 20180267421
    Abstract: A carrier is provided including a core particle and a resin layer coating the surface of the core particle. The resin layer includes fine metal particles, and a detected metal element amount A obtained by X-ray photoelectron spectrometry of the surface of the carrier is in a range of 4.0 atomic %?A?20.0 atomic % and an average major-axis length B of the fine metal particle exposing from the resin layer is in a range of 100 nm?B?800 nm.
    Type: Application
    Filed: March 5, 2018
    Publication date: September 20, 2018
    Inventors: Mariko TAKII, Koichi SAKATA, Tohru SUGANUMA, Masahiro SEKI, Masashi NAGAYAMA, Toyoaki TANO, Kohsuke MIYAZAKI
  • Patent number: 10025213
    Abstract: A toner including a binder resin, wherein the toner includes a tetrahydrofuran (THF)-insoluble component in a range of from 10% by mass through 40% by mass, wherein the toner has a main peak in a range of from 12,000 through 18,000 in a molecular weight distribution of a THF-soluble component as measured by gel permeation chromatography (GPC), wherein the main peak has a half value width in a range of from 20,000 to 50,000, and wherein the toner includes a component having a molecular weight of 2,000 or less in a range of from 10.0% by mass through 20.0% by mass and a component having a molecular weight of 100,000 or more of 8.0% by mass or less.
    Type: Grant
    Filed: February 29, 2016
    Date of Patent: July 17, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Masahiro Seki, Yoshitaka Sekiguchi, Satoshi Ogawa, Naoko Kitada
  • Publication number: 20180113393
    Abstract: A carrier for a developer of an electrostatic latent image, the carrier including: core particles having magnetism; and a coating layer coating a surface of each of the core particles, wherein the coating layer includes two or more kinds of inorganic particles, at least one kind of inorganic particles among the two or more kinds of inorganic particles is inorganic particles A having conductivity and a peak particle diameter of from 300 nm through 1,000 nm, and surface roughness of the carrier calculated by Formula 1 below is from 1.10 m2/g through 1.90 m2/g, C?F??Formula 1 where C is a BET specific surface area (m2/g) of the carrier and F is a BET specific surface area (m2/g) of the core particles.
    Type: Application
    Filed: October 12, 2017
    Publication date: April 26, 2018
    Inventors: Masahiro SEKI, Hiroyuki Kishida, Haruki Murata, Shinya Nakagawa, Kei Niwayama, Saori Yamada, Kohsuke Miyazaki
  • Publication number: 20180031992
    Abstract: A toner including a binder resin, wherein the toner includes a tetrahydrofuran (THF)-insoluble component in a range of from 10% by mass through 40% by mass, wherein the toner has a main peak in a range of from 12,000 through 18,000 in a molecular weight distribution of a THF-soluble component as measured by gel permeation chromatography (GPC), wherein the main peak has a half value width in a range of from 20,000 to 50,000, and wherein the toner includes a component having a molecular weight of 2,000 or less in a range of from 10.0% by mass through 20.0% by mass and a component having a molecular weight of 100,000 or more of 8.0% by mass or less.
    Type: Application
    Filed: February 29, 2016
    Publication date: February 1, 2018
    Inventors: Masahiro SEKI, Yoshitaka SEKIGUCHI, Satoshi OGAWA, Naoko KITADA
  • Publication number: 20170234434
    Abstract: A dust seal for sealing a gap between an opening and a shaft inserted through the opening includes a dust seal body in an annular shape and a bushing in an annular shape. The shaft is slidably inserted through the bushing. The dust seal body includes an attaching portion, a first accordion unit, and a second accordion unit. The first accordion unit and the second accordion unit are arranged side by side in a direction of an axis. The first accordion unit is integral with the attaching portion, is joined to the attaching portion at an outer periphery, and is fixed to the bushing at an inner periphery. The second accordion unit is fixed to the attaching portion at the outer periphery, and locked to the bushing at the inner periphery.
    Type: Application
    Filed: May 3, 2017
    Publication date: August 17, 2017
    Inventors: Yuichi Shuto, Masahiro Seki
  • Patent number: 9152066
    Abstract: A toner, including: a binder resin; releasing agent-encapsulating capsules; and a colorant, wherein the releasing agent-encapsulating capsules each include: a capsule formed of a resin (I) which is different from the binder resin; and a releasing agent (RA) which is encapsulated in the capsule, and the releasing agent-encapsulating capsules exist in the binder resin, and wherein 50% to 100% of the releasing agent-encapsulating capsules exist in a region from a surface of the toner to a depth of 0.10 times a volume-average particle diameter of the toner.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: October 6, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Ryota Inoue, Hiroaki Katoh, Masahiro Seki, Shun Saito, Yoshitaka Sekiguchi, Yoshihiro Mikuriya, Kazuoki Fuwa, Satoshi Ogawa, Tomohiro Fukao, Takayuki Nakamura
  • Patent number: 8852836
    Abstract: A toner including: a base resin; and charge-controlling resin particles contained in the base resin, wherein the toner is in shape of particles, and the charge-controlling resin particles are present in a region of each toner particle which is 500 nm in depth from a surface of the toner particle and an average of amounts of the charge-controlling resin particles present in the regions of the toner particles is 20% by volume to 70% by volume, wherein an average of embedment rates of the charge-controlling resin particles in the toner particles is 90% or higher, where each embedment rate is an average of embedment rates of the charge-controlling resin particles in each toner particle, and wherein the charge-controlling resin particles have a charge amount of 60 ?C/m2 or more as measured by a blow-off method.
    Type: Grant
    Filed: June 18, 2012
    Date of Patent: October 7, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Masahiro Seki, Yoshitaka Sekiguchi, Ryota Inoue, Kazuoki Fuwa