Patents by Inventor Kouji Azegami

Kouji Azegami 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).

  • Crystallized glass for information recording medium, crystallized glass substrate, and information recording medium using the crystallized glass substrate
    Patent number: 7264894
    Abstract: Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. The crystallized glasses are capable of providing a glass substrate having a high Young's modulus, as well as excellent mechanical strength, surface flatness, and heat resistance and having an excellent surface smoothness upon polishing. Glass substrate having an excellent surface smoothness using such a crystallized glass are also disclosed.
    Type: Grant
    Filed: September 7, 2005
    Date of Patent: September 4, 2007
    Assignee: Hoya Corporation
    Inventors: Xuleu Zou, Kouji Azegami
  • Crystallized glass for information recording medium, crystallized glass substrate, and information recording medium using the crystallized glass substrate
    Publication number: 20060040142
    Abstract: Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. The crystallized glasses are capable of providing a glass substrate having a high Young's modulus, as well as excellent mechanical strength, surface flatness, and heat resistance and having an excellent surface smoothness upon polishing. Glass substrate having an excellent surface smoothness using such a crystallized glass are also disclosed.
    Type: Application
    Filed: September 7, 2005
    Publication date: February 23, 2006
    Applicant: HOYA CORPORATION
    Inventors: Xuelu Zou, Kouji Azegami
  • Crystalized glass for information recording medium, crystallized glass substrate, and information recording medium using the crystallized glass substrate
    Patent number: 6960399
    Abstract: Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. The crystallized glasses are capable of providing a glass substrate having a high Young's modulus, as well as excellent mechanical strength, surface flatness, and heat resistance and having an excellent surface smoothness upon polishing. Glass substrate having an excellent surface smoothness using such a crystallized glass are also disclosed.
    Type: Grant
    Filed: June 23, 2004
    Date of Patent: November 1, 2005
    Assignee: Hoya Corporation
    Inventors: Xuelu Zou, Kouji Azegami
  • Crystalized glass for information recording medium, crystallized glass substrate, and information recording medium using the crystallized glass substrate
    Publication number: 20040241455
    Abstract: Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. The crystallized glasses are capable of providing a glass substrate having a high Young's modulus, as well as excellent mechanical strength, surface flatness, and heat resistance and having an excellent surface smoothness upon polishing. Glass substrate having an excellent surface smoothness using such a crystallized glass are also disclosed.
    Type: Application
    Filed: June 23, 2004
    Publication date: December 2, 2004
    Applicant: HOYA CORPORATION
    Inventors: Xuelu Zou, Kouji Azegami
  • Crystallized glass for information recording medium, crystallized glass substrate, and information recording medium using the crystallized glass substrate
    Patent number: 6774072
    Abstract: Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. The crystallized glasses are capable of providing a glass substrate having a high Young's modulus, as well as excellent mechanical strength, surface flatness, and heat resistance and having an excellent surface smoothness upon polishing. Glass substrate having an excellent surface smoothness using such a crystallized glass are also disclosed.
    Type: Grant
    Filed: February 25, 2003
    Date of Patent: August 10, 2004
    Assignee: Hoya Corporation
    Inventors: Xuelu Zou, Kouji Azegami
  • Crystallized glass for information recording medium, crystallized glass substrate, and information recording medium using the crystallized glass substrate
    Publication number: 20030171201
    Abstract: Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. The crystallized glasses are capable of providing a glass substrate having a high Young's modulus, as well as excellent mechanical strength, surface flatness, and heat resistance and having an excellent surface smoothness upon polishing. Glass substrate having an excellent surface smoothness using such a crystallized glass are also disclosed.
    Type: Application
    Filed: February 25, 2003
    Publication date: September 11, 2003
    Inventors: Xuelu Zou, Kouji Azegami
  • Crystallized glass for information recording medium, crystallized glass substrate, and information recording medium using the crystallized glass substrate
    Patent number: 6569792
    Abstract: Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. The crystallized glasses are capable of providing a glass substrate having a high Young's modulus, as well as excellent mechanical strength, surface flatness, and heat resistance and having an excellent surface smoothness upon polishing. Glass substrate having an excellent surface smoothness using such a crystallized glass are also disclosed.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: May 27, 2003
    Assignee: Hoya Corporation
    Inventors: Xuelu Zou, Kouji Azegami
  • Crystallized glass for information recording medium, crystallized glass substrate, and information recording medium using the crystallized glass substrate
    Publication number: 20020028740
    Abstract: Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. The crystallized glasses are capable of providing a glass substrate having a high Young's modulus, as well as excellent mechanical strength, surface flatness, and heat resistance and having an excellent surface smoothness upon polishing. Glass substrate having an excellent surface smoothness using such a crystallized glass are also disclosed.
    Type: Application
    Filed: July 26, 2001
    Publication date: March 7, 2002
    Inventors: Xuelu Zou, Kouji Azegami
  • Crystallized glass for information recording medium, crystallized glass substrate, and information recording medium using the crystallized glass substrate
    Patent number: 6294490
    Abstract: Enclosed are crystallized glasses suitable for a substrate for an information recording medium such as a magnetic disc, optical disc, or optomagnetic disc, a substrate for information recording medium using such a crystallized glass substrate, and an information recording medium using such a substrate for information recording medium. The crystallized glasses are capable of providing a glass substrate having a high Young's modulus, as well as excellent mechanical strength, surface flatness, and heat resistance and having an excellent surface smoothness upon polishing. Glass substrate having an excellent surface smoothness using such a crystallized glass are also disclosed.
    Type: Grant
    Filed: March 12, 1999
    Date of Patent: September 25, 2001
    Assignee: Hoya Corporation
    Inventors: Xuelu Zou, Kouji Azegami