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: 20210023778
    Abstract: A resin powder for solid freeform fabrication is provided which maintains the degree of smoothness of a thin layer formed with the resin powder for solid freeform fabrication even when the speed of supplying the resin powder for solid freeform fabrication using a recoater is increased and reduce lowering of the degree of smoothness of the thin layer caused by the resin powder for solid freeform fabrication that has scattered and accumulated on the recoater and others.
    Type: Application
    Filed: July 23, 2020
    Publication date: January 28, 2021
    Inventors: Sohichiroh Iida, Hitoshi Iwatsuki, Satoshi Ogawa, Yunsheng Sun
  • Publication number: 20200398458
    Abstract: Provided is a resin particle producing method including: a fiber aggregate producing step of directly joining fibers containing a thermoplastic resin with each other to obtain a fiber aggregate; and a particle forming step of forming the fiber aggregate into particles to obtain resin particles.
    Type: Application
    Filed: November 9, 2018
    Publication date: December 24, 2020
    Inventors: Nozomu TAMOTO, Hitoshi IWATSUKI, Yasuo SUZUKI, Yasuyuki YAMASHITA, Sohichiroh IIDA, Shinzo HIGUCHI, Akira SAITO, Kiichi KAMODA, Yoshihiko FURUGOHRI, Shinsuke NAGAI
  • 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
  • Patent number: 10682808
    Abstract: A fabrication method includes laminating a fabrication material to form an object, and applying a release material on a surface of the object to form a release layer on the surface of the object. A surface free energy of the release material is equal to or smaller than 25 mN/m.
    Type: Grant
    Filed: August 7, 2018
    Date of Patent: June 16, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Takashi Fujita, Akira Saito, Kiichi Kamoda, Yasutada Shitara, Kazuhiko Watanabe, Hitoshi Iwatsuki, Yuuya Endoh, Kazufumi Kimura, Yasuyuki Yamashita, Shinnosuke Koshizuka, Yuuki Kamon, Nozomu Tamoto
  • Publication number: 20200114574
    Abstract: A resin powder contains a resin contains columnar particles, wherein the proportion of the columnar particles having a ratio (L/W) of less than 1 is 50 percent by volume or more in the total volume of the resin powder, where W represents the width in the radial direction of the columnar particles and L represents the length in the axis direction of the columnar particles.
    Type: Application
    Filed: September 6, 2019
    Publication date: April 16, 2020
    Inventors: Kiichi KAMODA, Akira SAITO, Yasutomo AMAN, Hitoshi IWATSUKI
  • Publication number: 20200079011
    Abstract: A resin powder contains a resin containing particles, wherein the proportion of the particles in an aspect ratio range X represented by the following inequality 1 is 50 percent by number or more in a number distribution of an aspect ratio of the resin powder: A50?1?X?A50+1 Inequality 1, where A50 represents a median of the aspect ratio.
    Type: Application
    Filed: September 6, 2019
    Publication date: March 12, 2020
    Inventors: Hitoshi IWATSUKI, Sohichiroh IIDA, Yunsheng SUN, Satoshi OGAWA
  • 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: 20200070468
    Abstract: A fiber aggregation contains fiber containing a thermoplastic resin, each of the fiber being mutually joined and aligned.
    Type: Application
    Filed: September 3, 2019
    Publication date: March 5, 2020
    Inventors: Sohichiroh IIDA, Hitoshi IWATSUKI, Mitsuru NARUSE, Satoshi OGAWA, Yunsheng SUN
  • 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: 20190241734
    Abstract: A powder for solid freeform fabrication includes a first resin particle and a second resin particle, wherein MFR2 is greater than MFR1 and a ratio of MFR2 to MFR1 is from 2 to 5, where MFR1 represents a melt mass-flow rate (MFR) of the first resin particle and MFR2 represents a melt mass-flow rate of the second resin particle.
    Type: Application
    Filed: February 6, 2019
    Publication date: August 8, 2019
    Inventors: Mitsuru Naruse, Akira Saito, Hitoshi Iwatsuki, Yasuyuki Yamashita, Toshiyuki Mutoh, Yasutomo Aman, Kiichi Kamoda, Sohichiroh Iida, Shinzo Higuchi, Toshiyuki Iseki
  • Publication number: 20190134853
    Abstract: A particle for solid freeform fabrication having a columnar form has end surfaces and a side surface, wherein one of the end surfaces partially covers the side surface.
    Type: Application
    Filed: November 8, 2018
    Publication date: May 9, 2019
    Inventors: Hitoshi IWATSUKI, Yasuyuki YAMASHITA, Kiichi KAMODA, Toshiyuki MUTOH, Yasutomo AMAN, Toshiyuki ISEKI, Mitsuru NARUSE, Akira SAITO, Shinzo HIGUCHI, Sohichiroh IIDA
  • Publication number: 20190126538
    Abstract: A fabrication method includes laminating a fabrication material to form an object, and applying a release material on a surface of the object to form a release layer on the surface of the object. A surface free energy of the release material is equal to or smaller than 25 mN/m.
    Type: Application
    Filed: August 7, 2018
    Publication date: May 2, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: Takashi FUJITA, Akira SAITO, Kiichi KAMODA, Yasutada SHITARA, Kazuhiko WATANABE, Hitoshi IWATSUKI, Yuuya ENDOH, Kazufumi KIMURA, Yasuyuki YAMASHITA, Shinnosuke KOSHIZUKA, Yuuki KAMON, Nozomu TAMOTO
  • Patent number: 10233110
    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 50,000.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: March 19, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Takeo Yamaguchi, Hitoshi Iwatsuki, Kazumi Ohtaki, Takuya Saito, Teruki Kusahara
  • Patent number: 10197948
    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: Grant
    Filed: August 31, 2015
    Date of Patent: February 5, 2019
    Assignee: Ricoh Company, Ltd.
    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: 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: 20180264720
    Abstract: A resin powder for solid freeform fabrication contains pillar-like form particles having an average circularity of 0.83 or greater in a particle diameter range of from 0.5 to 200 ?m.
    Type: Application
    Filed: March 12, 2018
    Publication date: September 20, 2018
    Inventors: Nozomu TAMOTO, Sohichiroh IIDA, Akira SAITO, Yasuyuki YAMASHITA, Hitoshi IWATSUKI, Shinzo HIGUCHI, Kiichi KAMODA
  • 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
  • Patent number: 10067438
    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: Grant
    Filed: September 29, 2015
    Date of Patent: September 4, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshihiro Murasawa, Hiroshi Tohmatsu, Hitoshi Iwatsuki, Mariko Takii, Koichi Sakata, Hiroyuki Kishida, Toyoaki Tano, Kenichi Mashiko
  • Patent number: 10030154
    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: Grant
    Filed: March 17, 2016
    Date of Patent: July 24, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Mitsuru Naruse, Yasuo Suzuki, Nozomu Tamoto, Yasuyuki Yamashita, Hitoshi Iwatsuki, Kazumi Ohtaki
  • Publication number: 20180147780
    Abstract: A method of manufacturing a solid freeform fabrication object includes forming a layer of resin powder for solid freeform fabrication including particles having a pillar-like form and solidifying a particular area of the layer with irradiation of laser beams, wherein the laser beams have an energy intensity distribution having a top hat-like form.
    Type: Application
    Filed: November 27, 2017
    Publication date: May 31, 2018
    Inventors: Kiichi KAMODA, Yasuyuki YAMASHITA, Akira SAITO, Sohichiroh IIDA, Shinzo HIGUCHI, Hitoshi IWATSUKI, Nozomu TAMOTO, Yasuo SUZUKI