Patents by Inventor Sadatoshi Igaue

Sadatoshi Igaue 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: 20060292361
    Abstract: Disclosed herein is a front face erasable microcapsule magnetophoretic display sheet having a support and a solid dispersion layer provided on one surface of the support and composed of microcapsules having an average particle diameter of 50 to 650 ?m, in which a liquid dispersion, a white pigment, additives and magnetic particles are encapsulated, and a binder. The magnetic particles include at least two kinds of magnetic particles different in particle diameter from each other. An erasing magnet for front face erasing and a writing magnet for front face erasable microcapsule magnetophoretic display sheet are also disclosed.
    Type: Application
    Filed: November 30, 2005
    Publication date: December 28, 2006
    Inventors: Takashi Iwasaki, Takuya Yashuhara, Kenji Nonaka, Sadatoshi Igaue
  • Publication number: 20060147754
    Abstract: Disclosed herein is a front face erasable microcapsule magnetophoretic display sheet having a support and a solid dispersion layer provided on one surface of the support and composed of microcapsules having an average particle diameter of 50 to 650 ?m, in which a liquid dispersion, a white pigment, additives and magnetic particles are encapsulated, and a binder. The magnetic particles include at least two kinds of magnetic particles different in particle diameter from each other. An erasing magnet for front face erasing and a writing magnet for front face erasable microcapsule magnetophoretic display sheet are also disclosed.
    Type: Application
    Filed: November 30, 2005
    Publication date: July 6, 2006
    Inventors: Takashi Iwasaki, Takuya Yashuhara, Kenji Nonaka, Sadatoshi Igaue
  • Patent number: 7070856
    Abstract: Disclosed herein is a front face erasable microcapsule magnetophoretic display sheet having a support and a solid dispersion layer provided on one surface of the support and composed of microcapsules having an average particle diameter of 50 to 650 ?m, in which a liquid dispersion, a white pigment, additives and magnetic particles are encapsulated, and a binder. The magnetic particles include at least two kinds of magnetic particles different in particle diameter from each other. An erasing magnet for front face erasing and a writing magnet for front face erasable microcapsule magnetophoretic display sheet are also disclosed.
    Type: Grant
    Filed: December 18, 2002
    Date of Patent: July 4, 2006
    Assignees: A-Son Enterprise, Inc., Tocom Corporation
    Inventors: Takashi Iwasaki, Takuya Yashuhara, Kenji Nonaka, Sadatoshi Igaue
  • Publication number: 20060093858
    Abstract: Disclosed herein is a front face erasable microcapsule magnetophoretic display sheet having a support and a solid dispersion layer provided on one surface of the support and composed of microcapsules having an average particle diameter of 50 to 650 ?m, in which a liquid dispersion, a white pigment, additives and magnetic particles are encapsulated, and a binder. The magnetic particles include at least two kinds of magnetic particles different in particle diameter from each other. An erasing magnet for front face erasing and a writing magnet for front face erasable microcapsule magnetophoretic display sheet are also disclosed.
    Type: Application
    Filed: November 30, 2005
    Publication date: May 4, 2006
    Applicants: TOCOM CORPORATION
    Inventors: Takashi Iwasaki, Takuya Yashuhara, Kenji Nonaka, Sadatoshi Igaue
  • Publication number: 20030170457
    Abstract: Disclosed herein is a front face erasable microcapsule magnetophoretic display sheet having a support and a solid dispersion layer provided on one surface of the support and composed of microcapsules having an average particle diameter of 50 to 650 &mgr;m, in which a liquid dispersion, a white pigment, additives and magnetic particles are encapsulated, and a binder. The magnetic particles include at least two kinds of magnetic particles different in particle diameter from each other. An erasing magnet for front face erasing and a writing magnet for front face erasable microcapsule magnetophoretic display sheet are also disclosed.
    Type: Application
    Filed: December 18, 2002
    Publication date: September 11, 2003
    Applicant: A Son Enterprise Inc
    Inventors: Takashi Iwasaki, Takuya Yashuhara, Kenji Nonaka, Sadatoshi Igaue
  • Patent number: 6299972
    Abstract: The microcapsule magnetic display sheet is sequentially provided thereon with a transparent front sheet, a microcapsule layer coated on the transparent front sheet and then a ultraviolet ray curable resin layer. The ultraviolet ray curable resin layer is formed by painting liquid ultraviolet raycurable resin on the microcapsule layer first and then hardening it by irradiating it with UV rays. As the liquid ultraviolet ray curable resin can fill fine gaps of the microcapsules, no hollows left between the microcapsules and the UV resin layer. As the UV resin filled in gaps shares wording pressure, the microcapsules are fully protected and hardly be destroyed. After painting the liquid UV ray curable resin on the microcapsule layer and before it IS hardened, a separable film is covered on it. While a film is covered on it, the sheet is hard and if the film is separated, the sheet is soft. So the stiffness of the magnetic display sheet can be regulated by covering or not covering a film.
    Type: Grant
    Filed: July 2, 1998
    Date of Patent: October 9, 2001
    Assignee: Chemitech, Inc.
    Inventors: Takashi Iwasaki, Sadatoshi Igaue, Tutomu Saito
  • Patent number: 5972493
    Abstract: Gelatin microcapsules for magnetic display enclosing therein dispersion medium, magnetic powder and nonmagnetic powder, characterized in that that the dispersion medium in the microcapsules is composed of at least low boiling point solvent, particle diameter of the microcapsules is ion a range of 400 .mu.m tap 800 .mu.m and particles bigger than average are removed out. And solvents with boiling point higher than 175 .degree. C., dispersant and suspension are contained in the dispersion medium, magnetic powder and nonmagnetic powder are affinity-treated. The microcapsule magnetic display sheet is produced by coating the above-described microcapsules. Therefore, recording speed and erasing speed are fast and recorded words or pictures are clear even if a magnetic force lower than 1100 gauss is used.
    Type: Grant
    Filed: August 8, 1995
    Date of Patent: October 26, 1999
    Assignee: Chemitech, Inc.
    Inventors: Takashi Iwasaki, Sadatoshi Igaue, Atushi Ogura