Patents by Inventor Hitoshi Iwatsuki

Hitoshi Iwatsuki 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: 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: 9873228
    Abstract: A powder material for three-dimensional modeling includes a base particle and a resin covering the base particle, wherein the resin has a first absorption peak in the range of from 1,141 cm?1 to 1,145 cm?1 and a second absorption peak in the range of from 1,089 cm?1 to 1,093 cm?1 in an infrared absorption spectrum and the intensity ratio of the first absorption peak to the second absorption peak is from 0.40 to 0.70.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: January 23, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuo Suzuki, Mitsuru Naruse, Hitoshi Iwatsuki, Nozomu Tamoto, Kazumi Ohtaki, Yasuyuki Yamashita
  • Publication number: 20170329247
    Abstract: Provided is an electrostatic latent image developing white toner, including: a white toner including at least a binder resin, a white pigment, and a release agent; and a magnetic carrier including at least a core material, and a coating layer coating the core material and made of a coating resin and conductive particles, wherein Ra of the magnetic carrier is in a range of from 0.50 ?m to 1.00 ?m, and a bulk density of the magnetic carrier is in a range of from 2.08 g/cm3 to 2.24 g/cm3.
    Type: Application
    Filed: September 29, 2015
    Publication date: November 16, 2017
    Inventors: Yoshihiro MURASAWA, Hiroshi TOHMATSU, Hitoshi IWATSUKI, Mariko TAKII, Koichi SAKATA, Hiroyuki KISHIDA, Toyoaki TANO, Kenichi MASHIKO
  • 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
  • Publication number: 20170248871
    Abstract: A developing device, including: a developer containing toner and carrier; and developer bearer configured to have surface thereof bear the developer and endlessly move, and to develop latent image over surface of latent image bearer by supplying toner in developer to latent image in developing region facing the latent image bearer, wherein carrier contains fine particles, value X in volume resistivity R (=10X) (?·cm) of carrier is 11.5-16.0, developer bearer includes: magnetic field generating unit including a plurality of magnetic poles; and developing sleeve having a cylindrical shape enclosing magnetic field generating unit, and configured to bear developer over outer circumferential surface of cylindrical shape by magnetic force of the magnetic field generating unit and perform surface moving by rotating relative to developing device body, and developing device includes developing sleeve voltage applying unit configured to apply AC component-containing voltage to developing sleeve.
    Type: Application
    Filed: August 31, 2015
    Publication date: August 31, 2017
    Inventors: Hitoshi IWATSUKI, Koichi SAKATA, Hiroshi TOHMATSU, Toyoaki TANO, Kenichi MASHIKO, Mariko TAKII, Hiroyuki KISHIDA, Yoshihiro MURASAWA, Keinosuke KONDOH, Toshio KOIKE, Yutaka TAKAHASHI
  • Publication number: 20170209927
    Abstract: A solid freeform fabrication powder material includes a metal particle, and a water-soluble organic material particle. The water-soluble organic material particle accounts for 2-18 percent by volume of the solid freeform fabrication powder material and the water-soluble organic material particle has a volume average particle diameter of 3-15 ?m.
    Type: Application
    Filed: January 12, 2017
    Publication date: July 27, 2017
    Inventors: Yasuyuki YAMASHITA, Yasuo SUZUKI, Hitoshi IWATSUKI, Teruki KUSAHARA, Takeo YAMAGUCHI, Takuya SAITO, Nozomu TAMOTO
  • Patent number: 9708502
    Abstract: A powder for 3D modeling includes a base particle and a resin having a functional group represented by the following Chemical formula 1, where A1 represents O or NH and R1, R2, and R3 each, independently represent CH3, C2H5, C3H7, or C4H9. The base particle is covered with the resin.
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: July 18, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Mitsuru Naruse, Nozomu Tamoto, Yasuo Suzuki, Hitoshi Iwatsuki, Yasuyuki Yamashita, Kazumi Ohtaki
  • Publication number: 20160368806
    Abstract: A material set for manufacturing a glass object includes a powder material including glass and a first water soluble resin; and a liquid material including water and a second water soluble resin having a mass average molecular weight of less than 50
    Type: Application
    Filed: June 9, 2016
    Publication date: December 22, 2016
    Inventors: Takeo YAMAGUCHI, Hitoshi IWATSUKI, Kazumi OHTAKI, Takuya SAITO, Teruki KUSAHARA
  • 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: 20160288206
    Abstract: A powder material for three-dimensional modeling includes a base material and a resin covering the base material, wherein the covering factor by the resin is 15 percent or more and the aspect ratio of the powder material is 0.90 or greater as calculated according to the following relation 1. Aspect ratio (average)=X1×Y1/100+X2×Y2/100+ . . . +Xn×Yn/100,??Relation 1 In the Relation 1, Y1+Y2+ . . . +Yn=100 (percent), Xn represents the aspect ratio (minor axis/major axis), Yn represents an existence ratio (percent) of a particle having an aspect ratio of Xn, and n is 15,000 or greater.
    Type: Application
    Filed: March 23, 2016
    Publication date: October 6, 2016
    Inventors: Kazumi OHTAKI, Hitoshi Iwatsuki, Yasuyuki Yamashita, Mitsuru Naruse, Yasuo Suzuki, Nozomu Tamoto
  • Publication number: 20160272817
    Abstract: A powder material for three-dimensional modeling includes a base particle and a resin including a first water soluble resin and a second water soluble resin, wherein a first aqueous solution of the first water soluble resin having a concentration of two percent by mass has a thermally reversible sol-gel phase transition and is gelated at temperatures higher than a first phase transition temperature of the first aqueous solution.
    Type: Application
    Filed: March 17, 2016
    Publication date: September 22, 2016
    Inventors: Mitsuru Naruse, Yasuo Suzuki, Nozomu Tamoto, Yasuyuki Yamashita, Hitoshi Iwatsuki, Kazumi Ohtaki
  • Publication number: 20160271877
    Abstract: A powder material for three-dimensional modeling includes a base particle and a resin covering the base particle, wherein the resin has a first absorption peak in the range of from 1,141 cm?1 to 1,145 cm?1 and a second absorption peak in the range of from 1,089 cm?1 to 1,093 cm?1 in an infrared absorption spectrum and the intensity ratio of the first absorption peak to the second absorption peak is from 0.40 to 0.70.
    Type: Application
    Filed: March 9, 2016
    Publication date: September 22, 2016
    Inventors: Yasuo SUZUKI, Mitsuru Naruse, Hitoshi Iwatsuki, Nozomu Tamoto, Kazumi Ohtaki, Yasuyuki Yamashita
  • 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
  • Publication number: 20160177122
    Abstract: A powder for 3D modeling includes a base particle and a resin having a functional group represented by the following Chemical formula 1, where A1 represents O or NH and R1, R2, and R3 each, independently represent CH3, C2H5, C3H7, or C4H9. The base particle is covered with the resin.
    Type: Application
    Filed: December 2, 2015
    Publication date: June 23, 2016
    Inventors: Mitsuru NARUSE, Nozomu Tamoto, Yasuo Suzuki, Hitoshi Iwatsuki, Yasuyuki Yamashita, 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