Patents by Inventor Shigenori Yaguchi

Shigenori Yaguchi 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).

  • Patent number: 10800096
    Abstract: A resin powder for solid freeform fabrication includes resin particles having a significantly pillar-like form including resin particles having a concave portion on the circumferential side surface.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: October 13, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Sohichiroh Iida, Shigenori Yaguchi, Hitoshi Iwatsuki, Yasuo Suzuki, Nozomu Tamoto, Shinzo Higuchi, Akira Saito, Yasuyuki Yamashita, Kiichi Kamoda
  • Publication number: 20200070412
    Abstract: A resin powder contains a resin, wherein the proportion of fine powder having a number diameter of 40 percent or less of a mean number diameter Mn of the resin powder is 30 percent or less in the resin powder.
    Type: Application
    Filed: August 29, 2019
    Publication date: March 5, 2020
    Inventors: Yunsheng SUN, Toshiyuki Mutoh, Hitoshi Iwatsuki, Shigenori Yaguchi, Mitsuru Naruse, Sohichiroh IIDA
  • Publication number: 20200016827
    Abstract: Provided is a resin powder for producing a three-dimensional object, wherein the resin powder has a number-average equivalent circle diameter of 10 micrometers or greater but 150 micrometers or less, and wherein a median in an equivalent circle diameter-based particle size distribution of the resin powder is higher than the average equivalent circle diameter.
    Type: Application
    Filed: March 7, 2018
    Publication date: January 16, 2020
    Inventors: Yasuyuki YAMASHITA, Akira SAITO, Sohichiroh IIDA, Hitoshi IWATSUKI, Yasuo SUZUKI, Nozomu TAMOTO, Kiichi KAMODA, Shigenori YAGUCHI, Shinzo HIGUCHI, Toshiyuki ISEKI, Yasutomo AMAN, Toshiyuki MUTOH, Mitsuru NARUSE
  • Publication number: 20190284351
    Abstract: Provided are resin particles including columnar resin particles each including filaments of a fibrous material, wherein the filaments of the fibrous material are aligned in an axial direction of each of the columnar resin particles.
    Type: Application
    Filed: March 12, 2019
    Publication date: September 19, 2019
    Inventors: Shigenori YAGUCHI, Yasuyuki Yamashita, Akira Saito, Kiichi Kamoda
  • Publication number: 20180355144
    Abstract: A resin powder for solid freeform fabrication, having a melting point of 100 degrees C. or higher as measured according to ISO 3146 regulation and a ratio of melt mass-flow rate B to melt mass-flow rate A of greater than 0.80 to 1.20, wherein the melt mass-flow rate A and the melt mass-flow rate B are respectively measured at 15 degrees C. higher than the melting point under a load of 2.16 kg according to JIS K7210 format before and after the resin powder is maintained at a temperature 15 degrees C. lower than the melting point under a pressure of 0.1 kPa for four hours.
    Type: Application
    Filed: June 13, 2018
    Publication date: December 13, 2018
    Inventors: Akira SAITO, Shigenori YAGUCHI, Yasuo SUZUKI, Nozomu TAMOTO, Shinzo HIGUCHI, Hitoshi IWATSUKI
  • Publication number: 20180264721
    Abstract: A resin powder for solid freeform fabrication includes resin particles having a significantly pillar-like form including resin particles having a concave portion on the circumferential side surface.
    Type: Application
    Filed: March 13, 2018
    Publication date: September 20, 2018
    Inventors: Sohichiroh IIDA, Shigenori Yaguchi, Hitoshi Iwatsuki, Yasuo Suzuki, Nozomu Tamoto, Shinzo Higuchi, Akira Saito, Yasuyuki Yamashita, Kiichi Kamoda
  • Publication number: 20180023219
    Abstract: A resin powder for solid freeform fabrication includes a particle having a pillar-like form, wherein the ratio of the height of the particle to the diameter or the long side of the bottom of the particle is 0.5 to 2.0, the particle has a 50 percent cumulative volume particle diameter of from 5 to 200 ?m, and the ratio (Mv/Mn) of the volume average particle diameter (Mv) to the number average particle diameter (Mn) of the particle is 2.00 or less.
    Type: Application
    Filed: July 21, 2017
    Publication date: January 25, 2018
    Inventors: Akira SAITO, Shigenori YAGUCHI, Yasuyuki YAMASHITA, Kiichi KAMODA, Yasuo SUZUKI, Nozomu TAMOTO, Hitoshi IWATSUKI, Shinzo HIGUCHI, Sohichiroh IIDA
  • Publication number: 20180022024
    Abstract: A resin powder for solid freeform fabrication has a 50 percent cumulative volume particle diameter of from 5 to 100 ?m and a ratio (Mv/Mn) of a volume average particle diameter (Mv) to the number average particle diameter (Mn) of 2.50 or less and satisfies at least one of the following conditions (1) to (3): (1): Tmf1>Tmf2 and (Tmf1?Tmf2)?3 degrees C., both Tmf1 and Tmf2 are measured in differential scanning calorimetry measuring according to ISO 3146, (2): Cd1>Cd2 and (Cd1?Cd2)?3 percent, both Cd1 and Cd2 are measured in differential scanning calorimetry measuring according to ISO 3146, and (3): C×1>C×2 and (C1?C2)?3 percent.
    Type: Application
    Filed: July 21, 2017
    Publication date: January 25, 2018
    Inventors: Akira SAITO, Yasuyuki YAMASHITA, Kiichi KAMODA, Shigenori YAGUCHI, Nozomu TAMOTO, Hitoshi IWATSUKI, Shinzo HIGUCHI, Sohichiroh llDA, Yasuo SUZUKI
  • Patent number: 9782935
    Abstract: A powder material for three-dimensional modeling includes a base particle and a coverage film including an organic material. The coverage film covers the base particle. The powder material is used for three dimensional modeling and when the coverage film is dissolved in a solvent to prepare a solution and the solution is formed into a coated film on a smooth surface, the coated film has a wetting tension of from 22 mN/m to 28 mN/m.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: October 10, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuyuki Yamashita, Yasuo Suzuki, Mitsuru Naruse, Nozomu Tamoto, Shigenori Yaguchi, Hitoshi Iwatsuki, Kazumi Ohtaki
  • Patent number: 9519234
    Abstract: There is provided a carrier including magnetic core particles; and a coating layer on a surface of each of the magnetic core particles, wherein the coating layer contains electroconductive particles; wherein the electroconductive particles are electroconductive particles in which white inorganic pigments are coated with phosphorus-doped tin or tungsten-doped tin; and wherein a dope ratio of phosphorus or tungsten to tin in the phosphorus-doped tin or tungsten-doped tin is 0.010 to 0.100.
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: December 13, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroyuki Kishida, Shigenori Yaguchi, Hiroshi Tohmatsu, Koichi Sakata, Hitoshi Iwatsuki, Toyoaki Tano
  • Publication number: 20160271879
    Abstract: A powder material for three-dimensional modeling includes a base particle and a coverage film including an organic material. The coverage film covers the base particle. The powder material is used for three dimensional modeling and when the coverage film is dissolved in a solvent to prepare a solution and the solution is formed into a coated film on a smooth surface, the coated film has a wetting tension of from 22 mN/m to 28 mN/m.
    Type: Application
    Filed: March 9, 2016
    Publication date: September 22, 2016
    Inventors: Yasuyuki YAMASHITA, Yasuo SUZUKI, Mitsuru NARUSE, Nozomu TAMOTO, Shigenori YAGUCHI, Hitoshi IWATSUKI, Kazumi OHTAKI
  • Patent number: 9304427
    Abstract: A carrier for developing an electrostatic latent image of the present invention includes a core material and a coating layer which coats the core material, wherein the coating layer includes a resin and fine particles, wherein the coating layer has an average layer thickness difference of 0.02 ?m to 3.0 ?m, and wherein the carrier for developing an electrostatic latent image has an arithmetic mean surface roughness Ra1 of 0.5 ?m to 0.9 ?m.
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: April 5, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Hitoshi Iwatsuki, Shigenori Yaguchi, Toyoaki Tano, Mariko Takii, Koichi Sakata, Hiroyuki Kishida, Hiroshi Tohmatsu
  • Patent number: 9298119
    Abstract: A carrier is provided. The carrier includes a particulate magnetic core, and a cover layer located on the surface of the particulate magnetic core and including a resin and a filler. When determined from observation of cross-section of the carrier, the shape factor SF2 of the carrier is from 120 to 160, the ratio of the average domain diameter of the particulate magnetic core to the number average particle diameter of the filler is from 1:1 to 1:0.003, and the area ratio of the filler in the cover layer is from 30 to 85%.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: March 29, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Shigenori Yaguchi, Koichi Sakata, Hitoshi Iwatsuki, Toyoaki Tano, Hiroyuki Kishida, Kenichi Mashiko, Hiroshi Tohmatsu
  • Patent number: 9261817
    Abstract: A replenishing developer housing container includes: a container body housing a replenishing developer; a conveying portion; a pipe receiving port; and an uplifting portion. The replenishing developer contains a toner and a carrier. The container body includes a protruding portion protruding from a container body interior side of the container opening portion toward one end of the container body and a curving portion curving so as to conform to the protruding portion. The uplifting portion includes an uplifting wall surface extending from an internal wall surface of the container body toward the protruding portion. When the replenishing developer housing container is mounted on the replenishing developer conveying device, the protruding portion is present between the curving portion and the replenishing developer receiving port of a conveying pipe being inserted.
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: February 16, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hitoshi Iwatsuki, Shigenori Yaguchi, Hiroshi Tohmatsu, Toyoaki Tano, Hiroyuki Kishida, Kenichi Mashiko, Koichi Sakata, Hiroshi Hosokawa, Shunji Katoh, Shinji Tamaki, Hiroshi Ikeguchi, Kenji Kikuchi, Michiharu Suzuki
  • Patent number: 9229347
    Abstract: A carrier for use in a two-component developer for developing an electrostatic latent image is provided. The carrier includes a particulate magnetic core; and a cover layer located on a surface of the particulate magnetic core and including a resin and a particulate electroconductive material. The carrier has a BET specific surface area of from 0.8 to 1.6 m2/g.
    Type: Grant
    Filed: December 16, 2013
    Date of Patent: January 5, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroyuki Kishida, Shigenori Yaguchi, Hiroshi Tohmatsu, Koichi Sakata, Hitoshi Iwatsuki, Toyoaki Tano, Kenichi Mashiko
  • Patent number: 9146487
    Abstract: A carrier for developing electrostatic latent images includes a core material; and a covering layer formed of a resin comprising an electroconductive particulate material, overlying the core material, wherein the covering layer includes the electroconductive particulate material in an amount of from 58 to 73% by weight and has a resistivity of from 6.6 to 8.6 ?cm, and wherein the carrier has a high-brightness contrast part at an areal ratio less than 1% and 40 to 90% based on total area thereof at an acceleration voltage of 0.8 KV and 2.0 KV, respectively in an FE-SEM reflection electron image of the surface thereof.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: September 29, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Toyoshi Sawada, Shigenori Yaguchi, Hiroshi Tohmatsu, Hitoshi Iwatsuki, Toyoaki Tano, Hiroyuki Kishida, Yumiko Yagi
  • Publication number: 20150153665
    Abstract: There is provided a carrier including magnetic core particles; and a coating layer on a surface of each of the magnetic core particles, wherein the coating layer contains electroconductive particles; wherein the electroconductive particles are electroconductive particles in which white inorganic pigments are coated with phosphorus-doped tin or tungsten-doped tin; and wherein a dope ratio of phosphorus or tungsten to tin in the phosphorus-doped tin or tungsten-doped tin is 0.010 to 0.100.
    Type: Application
    Filed: June 26, 2013
    Publication date: June 4, 2015
    Inventors: Hiroyuki Kishida, Shigenori Yaguchi, Hiroshi Tohmatsu, Koichi Sakata, Hitoshi Iwatsuki, Toyoaki Tano
  • Patent number: 8916325
    Abstract: A carrier for developing electrostatic latent image, including a particulate magnetic core material; and a coated layer covering the surface of the particulate magnetic core material, wherein the coated layer includes a resin including a silicone resin and a methacrylic ester or an acrylic ester resin, and a filler including a substrate; and an electroconductive layer comprising tin dioxide (SnO2), overlying the substrate, and wherein the carrier includes tin (Sn) in an amount not less than 0.5% by atom and has a ratio (Sn/Si) of tin (Sn) to silicon (Si) of from 0.03 to 0.2 when subjected to an XPS analysis.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: December 23, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Shigenori Yaguchi, Hiroshi Tohmatsu, Koichi Sakata, Hitoshi Iwatsuki, Hiroyuki Kishida, Toyoaki Tano
  • Patent number: 8918025
    Abstract: To provide an image forming method, containing: a charging step, a latent electrostatic image forming step, a developing step, a transferring step, and a fixing step, wherein the developing step is developing the latent electrostatic image formed on the latent electrostatic image bearing member with a two-component developer containing a toner and a carrier by a developing element to form a visible image, where the developing contains: stirring the toner and the carrier to prepare the two-component developer to have a flow energy amount of 30 mJ to 70 mJ; and periodically discharging and transporting the stirred two-component to the developer unit by air pressure to thereby supply the two-component developer for the developing.
    Type: Grant
    Filed: July 13, 2012
    Date of Patent: December 23, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Tohmatsu, Shigenori Yaguchi, Hitoshi Iwatsuki, Toyoaki Tano, Koichi Sakata, Mariko Takii
  • Patent number: 8903270
    Abstract: A developing device including a developer bearing member containing a magnetic field generator having multiple magnetic poles and a developer containing chamber is provided. The developer containing chamber contains a two-component developer comprising magnetic carrier particles having a saturated magnetization of 58 to 70 emu/g in a magnetic field of 1KOe and toner particles, and has a divider to define an upper supply chamber and a lower collection chamber. The supply chamber includes a supply conveyer to supply the two-component developer to the developer bearing member at an upstream side from the developing area. The collection chamber includes a collection conveyer to collect the two-component developer from the developer bearing member at a downstream side from the developing area. The multiple magnetic poles includes three developer bearing poles capable of bearing the developer on its surface.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: December 2, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Koichi Sakata, Shigenori Yaguchi, Toyoshi Sawada, Hitoshi Iwatsuki, Hiroyuki Kishida