Patents by Inventor Hiroshi Yuki

Hiroshi Yuki 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).

  • Glass composition for crystallized glass
    Patent number: 6642162
    Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.
    Type: Grant
    Filed: April 2, 2001
    Date of Patent: November 4, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Glass composition for crystallized glass
    Patent number: 6642161
    Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.
    Type: Grant
    Filed: April 2, 2001
    Date of Patent: November 4, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Glass composition for crystallized glass
    Patent number: 6635591
    Abstract: A polished glass disk medium substrate suitable for use as a substrate for a hard disk, a hard disk containing the substrate and methods for making the substrate. The substrate containing glass forming raw materials may be formed so as to have a Young's modulus of 110 or higher.
    Type: Grant
    Filed: April 2, 2001
    Date of Patent: October 21, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Hiroshi Yuki, Toshiharu Mori, Hideki Kawai, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6627567
    Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 35 to 60 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO and from 0.1 to 1.8 wt % of P2O5.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: September 30, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6624101
    Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 51 to 57.5 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 0.1 to 6.8 wt % of TiO2.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: September 23, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6610620
    Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 48 to 54.8 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 2.4 to 10 wt % of Li2O.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: August 26, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6596659
    Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 35 to 50 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 2.6 to 8 wt % of Li2O.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: July 22, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6593257
    Abstract: A glass ceramics composition for recording disk substrate consists essentially, expressed in terms of weight percent on the oxide basis, of from 65 to 80 wt % of SiO2, from 3 to 15 wt % of Al2O3, from 3 to 15 wt % of Li2O, from 0.2 to 5 wt % of P2O5, and from 0.1 to 15 wt % of ZrO2, wherein a value of ZrO2/P2O5 is within a range from 1.1 to 8.5, expressed in terms of weight percent on the oxide basis.
    Type: Grant
    Filed: July 5, 2000
    Date of Patent: July 15, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Hideki Kawai, Toshiharu Mori, Hiroshi Yuki, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6593259
    Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 54.5 to 59.5 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 3 to 12 wt % of Li2O.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: July 15, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Publication number: 20030125183
    Abstract: A glass ceramics composition for recording disk substrate consists essentially, expressed in terms of weight percent on the oxide basis, of from 65 to 80 wt % of SiO2, from 3 to 15 wt % of Al2O3, from 3 to 15 wt % of Li2O, from 0.2 to 5 wt % of P2O5, and from 0.1 to 0.8 wt % of ZrO2.
    Type: Application
    Filed: December 4, 2002
    Publication date: July 3, 2003
    Inventors: Hideki Nagata, Hideki Kawai, Toshiharu Mori, Hiroshi Yuki, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6583078
    Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 47.5 to 58 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 0.1 to 2.8 wt % of ZrO2.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: June 24, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6583077
    Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 50.5 to 56 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 4.2 to 10.6 wt % of TiO2.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: June 24, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6573206
    Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 47.5 to 52.5 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 6.2 to 7.8 wt % of TiO2.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: June 3, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6569790
    Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 54 to 60 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 0.1 to 2.7 wt % of Li2O.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: May 27, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6569791
    Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 52 to 56 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 7 to 12 wt % of TiO2.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: May 27, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6524982
    Abstract: A glass ceramics composition for recording disk substrate consists essentially, expressed in terms of weight percent on the oxide basis, of from 65 to 80 wt % of SiO2, from 3 to 15 wt % of Al2O3, from 3 to 15 wt % of Li2O, from 0.2 to 5 wt % of P2O5, and from 2.5 to 12 wt % of ZrO2.
    Type: Grant
    Filed: July 5, 2000
    Date of Patent: February 25, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Hideki Kawai, Toshiharu Mori, Hiroshi Yuki, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6514890
    Abstract: A glass ceramics composition for recording disk substrate consists essentially, expressed in terms of weight percent on the oxide basis, of from 65 to 80 wt % of SiO2, from 3 to 15 wt % of Al2O3, from 3 to 15 wt % of Li2O, from 0.2 to 5 wt % of P2O5, and from 0.1 to 0.8 wt % of ZrO2.
    Type: Grant
    Filed: July 5, 2000
    Date of Patent: February 4, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Hideki Kawai, Toshiharu Mori, Hiroshi Yuki, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6458730
    Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis, from 53.5 to 60 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 3.5 to 8.8 wt % of TiO2.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: October 1, 2002
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6458728
    Abstract: A glass ceramics composition for recording disk substrate consists essentially, expressed in terms of weight percent on the oxide basis, of from 65 to 80 wt % of SiO2, from 3 to 15 wt % of Al2O3, from 3 to 15 wt % of Li2O, from 0.2 to 5 wt % of P2O5, and from 0.1 to 0.8 wt % of TiO2.
    Type: Grant
    Filed: July 5, 2000
    Date of Patent: October 1, 2002
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Hideki Kawai, Toshiharu Mori, Hiroshi Yuki, Kazuhiko Ishimaru
  • Glass-ceramic composition for recording disk substrate
    Patent number: 6458729
    Abstract: A glass ceramics composition for recording disk substrate contains, essentially, expressed in terms of weight percent on the oxide basis; from 50.5 to 52.5 wt % of SiO2, from 10 to 30 wt % of Al2O3, from 10 to 30 wt % of MgO, and from 4 to 10.6 wt % of TiO2.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: October 1, 2002
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Nagata, Toshiharu Mori, Hiroshi Yuki, Hideki Kawai, Akira Sugimoto, Kazuhiko Ishimaru