Patents by Inventor Atsushi Hitomi

Atsushi Hitomi 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: 20100137123
    Abstract: An object is to provide a sintered body having a sufficiently higher polishing rate than a conventional AlTiC sintered body and providing a sufficiently smooth air bearing surface. The sintered body according to the present invention consists of Al2O3 and a compound represented by the chemical formula (1) below: TiCxOy??(1) wherein x+y?1, x>0 and 0.3<y?0.6.
    Type: Application
    Filed: November 23, 2009
    Publication date: June 3, 2010
    Applicant: TDK Corporation
    Inventors: Kei Sugiura, Atsushi Hitomi, Hiroyuki Ono
  • Publication number: 20100020454
    Abstract: An ESD protection device that has low capacitance, excellent discharge characteristics, and improved heat resistance and weather resistance is provided. A functional layer 31, which is a composite having a conductive inorganic material 33 discretely dispersed in a matrix of an insulating inorganic material 32, is disposed between electrodes 21 and 22 disposed on an insulating substrate 11 and facing but spaced apart from each other.
    Type: Application
    Filed: July 22, 2009
    Publication date: January 28, 2010
    Applicant: TDK CORPORATION
    Inventors: Yasuhiro Hirobe, Kensaku Asakura, Atsushi Hitomi, Takeshi Urano
  • Patent number: 7595274
    Abstract: A sintered body for a magnetic head slider, which can reduce differences in level of an air bearing surface while yielding a high strength, a magnetic head slider using the same, and a method of manufacturing a sintered body for a magnetic head slider are provided. The sintered body of the present invention is a sintered body comprising alumina crystal grains and a thin film containing carbon provided at a grain boundary between the alumina crystal grains, whereas the alumina crystal grains have an average particle size of 0.05 to 0.5 ?m.
    Type: Grant
    Filed: June 21, 2006
    Date of Patent: September 29, 2009
    Assignee: TDK Corporation
    Inventors: Atsushi Hitomi, Keiko Kubo, Yukio Kawaguchi, Kei Sugiura, Tsuneo Kuwahara
  • Patent number: 7502201
    Abstract: The magnetic head slider material of the present invention is a magnetic head slider material made of a sintered body containing alumina, titanium carbide, and carbon; wherein a titanium carbide crystal grain has an average crystal grain size greater than that of an alumina crystal grain in the sintered body.
    Type: Grant
    Filed: December 20, 2005
    Date of Patent: March 10, 2009
    Assignee: TDK Corporation
    Inventors: Kei Sugiura, Yukio Kawaguchi, Atsushi Hitomi
  • Publication number: 20080309448
    Abstract: A stacked PTC thermistor 1 comprises a body 4 obtained by alternating lamination of a semiconductor ceramic layer 2 and an internal electrode 3, and a pair of external electrodes 5a, 5b provided at the edge faces 4a, 4b of the body 4 and electrically connected with the internal electrode 3. The semiconductor ceramic layer 2 is composed of a porous sintered compact containing crystal grains of a barium titanate-based compound, and an alkali metal element is preferentially distributed in at least one of the grain boundaries and voids of the sintered compact.
    Type: Application
    Filed: June 11, 2008
    Publication date: December 18, 2008
    Applicant: TDK Corporation
    Inventors: Kazuhiko ITOH, Akira Kakinuma, Atsushi Hitomi
  • Patent number: 7446978
    Abstract: The magnetic head slider material of the present invention is constituted by a sintered body containing 100 parts by weight of alumina, 20 to 120 parts by weight of titanium carbide, and 0.2 to 9 parts by weight of carbon.
    Type: Grant
    Filed: May 17, 2005
    Date of Patent: November 4, 2008
    Assignee: TDK Corporation
    Inventors: Yukio Kawaguchi, Kei Sugiura, Masahiro Itoh, Minoru Sakurabayashi, Atsushi Hitomi
  • Patent number: 7381670
    Abstract: A material for a magnetic head slider according to the present invention is a magnetic head slider material comprised of a sintered body containing alumina and titanium carbide, in which an area percentage of an area of alumina crystal grains and titanium carbide crystal grains having a crystal grain size of not less than 200 nm nor more than 350 nm to an area of alumina crystal grains and titanium carbide crystal grains in a cut surface of the sintered body is not less than 80%.
    Type: Grant
    Filed: May 8, 2006
    Date of Patent: June 3, 2008
    Assignee: TDK Corporation
    Inventors: Kei Sugiura, Yukio Kawaguchi, Atsushi Hitomi
  • Patent number: 7345849
    Abstract: The magnetic head slider material of the present invention is constituted by a sintered body containing 100 parts by weight of alumina, 20 to 150 parts by weight of titanium carbide and silicon carbide in total, and 0.2 to 9 parts by weight of carbon.
    Type: Grant
    Filed: June 27, 2005
    Date of Patent: March 18, 2008
    Assignees: TDK Corporation, SAE Magnetics (H.K.) Ltd.
    Inventors: Yukio Kawaguchi, Kei Sugiura, Masahiro Itoh, Minoru Sakurabayashi, Atsushi Hitomi, Cheng Yih Liu
  • Patent number: 7245066
    Abstract: A flat panel display spacer has a sintered body containing A12O3, TiC, MgO, and TiO2, whereas the sintered body includes 35 to 55 wt % of MgO with respect to the total weight of A12O3, TiC, MgO, and TiO2.
    Type: Grant
    Filed: July 28, 2004
    Date of Patent: July 17, 2007
    Assignee: TDK Corporation
    Inventors: Yukio Kawaguchi, Atsushi Hitomi, Kazumitsu Tanaka, Takao Matsumoto, Masahiro Itoh, Kenichi Jinguji, Tsutomu Koyanagi, Katsuyuki Kurachi
  • Publication number: 20070153421
    Abstract: The magnetic head slider material of the present invention is a magnetic head slider material made of a sintered body containing alumina, titanium carbide, and carbon; wherein a titanium carbide crystal grain has an average crystal grain size greater than that of an alumina crystal grain in the sintered body.
    Type: Application
    Filed: December 20, 2005
    Publication date: July 5, 2007
    Applicant: TDK Corporation
    Inventors: Kei Sugiura, Yukio Kawaguchi, Atsushi Hitomi
  • Publication number: 20070024171
    Abstract: A flat panel display spacer has a sintered body containing A12O3, TiC, MgO, and TiO2, whereas the sintered body includes 35 to 55 wt % of MgO with respect to the total weight of A12O3, TiC, MgO, and TiO2.
    Type: Application
    Filed: July 28, 2004
    Publication date: February 1, 2007
    Applicant: TDK CORPORATION
    Inventors: Yukio Kawaguchi, Atsushi Hitomi, Kazumitsu Tanaka, Takao Matsumoto, Masahiro Itoh, Kenichi Jinguji, Tsutomu Koyanagi, Katsuyuki Kurachi
  • Publication number: 20070007875
    Abstract: A sintered body containing Al2O3, TiC, and TiO2 such that 6.5 to 10 wt % of TiC and 1.0 to 2.5 wt % of TiO2 exist with respect to the total weight of Al2O3, TiC, and TiO2 is employed as a flat panel display spacer base material.
    Type: Application
    Filed: May 21, 2004
    Publication date: January 11, 2007
    Applicant: TDK Corporation
    Inventors: Yukio Kawaguchi, Atsushi Hitomi, Kazumitsu Tanaka, Takao Matsumoto, Masahiro Itoh, Kenichi Jinguji, Tsutomu Koyanagi
  • Publication number: 20060293167
    Abstract: A sintered body for a magnetic head slider, which can reduce differences in level of an air bearing surface while yielding a high strength, a magnetic head slider using the same, and a method of manufacturing a sintered body for a magnetic head slider are provided. The sintered body of the present invention is a sintered body comprising alumina crystal grains and a thin film containing carbon provided at a grain boundary between the alumina crystal grains, whereas the alumina crystal grains have an average particle size of 0.05 to 0.5 ?m.
    Type: Application
    Filed: June 21, 2006
    Publication date: December 28, 2006
    Applicant: TDK CORPORATION
    Inventors: Atsushi Hitomi, Keiko Kubo, Yukio Kawaguchi, Kei Sugiura, Tsuneo Kuwahara
  • Publication number: 20060293166
    Abstract: A material for a magnetic head slider according to the present invention is a magnetic head slider material comprised of a sintered body containing alumina and titanium carbide, in which an area percentage of an area of alumina crystal grains and titanium carbide crystal grains having a crystal grain size of not less than 200 nm nor more than 350 nm to an area of alumina crystal grains and titanium carbide crystal grains in a cut surface of the sintered body is not less than 80%.
    Type: Application
    Filed: May 8, 2006
    Publication date: December 28, 2006
    Applicant: TDK CORPORATION
    Inventors: Kei Sugiura, Yukio Kawaguchi, Atsushi Hitomi
  • Publication number: 20060181187
    Abstract: A spacer for a flat panel display having a coefficient of thermal expansion equal or close to that of a glass and having a strength and a predetermined conductivity is provided. The spacer for a flat panel display includes a sintered body containing MgAl2O4 preferably as a main phase. The sintered body preferably further contains MgO, and if it contains MgAl2O4 and MgO, a peak strength on a MgO (200) surface is preferably 0.5 to 50 when a peak strength on a MgAl2O4 (311) surface is 100 as measured by X-ray diffraction. The spacer is placed between a back plate having a cathode structure and a face plate placed with a predetermined spacing between itself and the back plate and having fluorescent pixel areas, and plays a role of maintaining the spacing.
    Type: Application
    Filed: February 14, 2006
    Publication date: August 17, 2006
    Inventors: Mio Hosokawa, Yukio Kawaguchi, Atsushi Hitomi, Keiko Kubo, Emi Ninomiya, Hiroaki Sawada
  • Publication number: 20060002027
    Abstract: The magnetic head slider material of the present invention is constituted by a sintered body containing 100 parts by weight of alumina, 20 to 150 parts by weight of titanium carbide and silicon carbide in total, and 0.2 to 9 parts by weight of carbon.
    Type: Application
    Filed: June 27, 2005
    Publication date: January 5, 2006
    Applicants: TDK CORPORATION, SAE MAGNETICS (H.K.) LTD.
    Inventors: Yukio Kawaguchi, Kei Sugiura, Masahiro Itoh, Minoru Sakurabayashi, Atsushi Hitomi, Cheng Liu
  • Publication number: 20050259363
    Abstract: The magnetic head slider material of the present invention is constituted by a sintered body containing 100 parts by weight of alumina, 20 to 120 parts by weight of titanium carbide, and 0.2 to 9 parts by weight of carbon.
    Type: Application
    Filed: May 17, 2005
    Publication date: November 24, 2005
    Applicant: TDK CORPORATION
    Inventors: Yukio Kawaguchi, Kei Sugiura, Masahiro Itoh, Minoru Sakurabayashi, Atsushi Hitomi
  • Publication number: 20050178492
    Abstract: By minimizing polishing after sintering, there provided a method for producing a spacer for a flat panel display, which can reduce the processing man-hour and processing cost. A green sheet is prepared from a slurry including a predetermined raw material powder and a binder, the binder is removed from the green sheet, and the binder removed green sheet is sintered with a loading member loaded thereon, which has a surface of a predetermined flatness contacting the green sheet. Preferably, the spacer contains TiC and/or TiO2 and Al2O3 with a composition consisting essentially of 5.0 to 16.0 mol % of TiC, 0.5 to 20.0 mol % of TiO2, and the balance being substantially Al2O3, or contains TiC and/or TiO2, MgO and Al2O3 with a composition consisting essentially of 5.0 to 16.0 mol % of TiC, 0.5 to 20.0 mol % of TiO2, 80.0 mol % or less of MgO and the balance being substantially Al2O3.
    Type: Application
    Filed: February 16, 2005
    Publication date: August 18, 2005
    Inventors: Keiko Kubo, Atsushi Hitomi, Yukio Kawaguchi, Hiroaki Sawada, Mio Hosokawa
  • Patent number: 6160472
    Abstract: A multilayer varistor comprising a varistor chip body having alternately stacked ceramic layers and internal electrode layers is provided. The ceramic layer is composed of a composite oxide containing Ti and/or Zr and Ba as a main component and Si and/or Al as a subordinate component, substantially free of Cr, and has a perovskite phase. The internal electrode layer is composed of a conductor containing a base metal such as Ni or Ni alloy as a main component. The varistor is used in an electric circuit for suppressing noise.
    Type: Grant
    Filed: March 22, 1996
    Date of Patent: December 12, 2000
    Assignee: TDK Corporation
    Inventors: Tomohiro Arashi, Yukie Nakano, Atsushi Hitomi, Akira Sato, Takeshi Nomura
  • Patent number: 5319517
    Abstract: The invention provides a multilayer ceramic chip capacitor having internal electrodes and dielectric layers, wherein a dielectric material containing a dielectric oxide having a composition of the following formula:[(Ba.sub.1-x-y Ca.sub.x Sr.sub.y)O].sub.m (Ti.sub.1-z Zr.sub.z)O.sub.2wherein 0.ltoreq.x.ltoreq.0.25, 0.ltoreq.y.ltoreq.0.05, 0.1.ltoreq.z.ltoreq.0.3, and 1.000.ltoreq.m.ltoreq.1.020 and having added thereto an oxide of Mn and/or a compound which converts to the oxide upon firing in an amount of 0.01 to 0.5% by weight calculated as oxide (MnO), an oxide of Y and/or a compound which converts to the oxide upon firing in an amount of 0.05 to 0.5% by weight calculated as oxide (Y.sub.2 O.sub.3), an oxide of V and/or a compound which converts to the oxide upon firing in an amount of 0.005 to 0.3% by weight calculated as oxide (V.sub.2 O.sub.5), and an oxide of W and/or a compound which converts to the oxide upon firing in an amount of 0.005 to 0.3% by weight calculated as oxide (WO.sub.
    Type: Grant
    Filed: March 29, 1993
    Date of Patent: June 7, 1994
    Assignee: TDK Corporation
    Inventors: Takeshi Nomura, Yukie Nakano, Akira Satoh, Atsushi Hitomi