Patents by Inventor Yu Oogami

Yu Oogami 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).

  • Method of molding a glass composition into an optical element
    Patent number: 6776007
    Abstract: A mold has a moling surface of a material containing silicon carbide and/or silicon nitride as a main component and a carbon thin film formed on the molding surface to prevent fusion sticking. A glass substance which has a sag point not higher than 565° C. and a predetermined composition free from arsenic oxide is introduced into the mold. The glass substance is press-formed in a heated and softened condition into a glass optical element of high precision.
    Type: Grant
    Filed: May 16, 2003
    Date of Patent: August 17, 2004
    Assignee: Hoya Corporation
    Inventors: Shin-Ichiro Hirota, Yu Oogami, Kazuaki Hashimoto
  • Method of molding a glass composition into an optical element
    Publication number: 20030200766
    Abstract: A mold has a moling surface of a material containing silicon carbide and/or silicon nitride as a main component and a carbon thin film formed on the molding surface to prevent fusion sticking. A glass substance which has a sag point not higher than 565° C. and a predetermined composition free from arsenic oxide is introduced into the mold. The glass substance is press-formed in a heated and softened condition into a glass optical element of high precision.
    Type: Application
    Filed: May 16, 2003
    Publication date: October 30, 2003
    Applicant: HOYA CORPORATION
    Inventors: Shin-Ichiro Hirota, Yu Oogami, Kazuaki Hashimoto
  • Method molding a glass composition into an optical element with reduced pull-out
    Patent number: 6588231
    Abstract: A mold has a moling surface of a material containing silicon carbide and/or silicon nitride as a main component and a carbon thin film formed on the molding surface to prevent fusion sticking. A glass substance which has a sag point not higher than 565° C. and a predetermined composition free from arsenic oxide is introduced into the mold. The glass substance is press-formed in a heated and softened condition into a glass optical element of high precision.
    Type: Grant
    Filed: November 12, 1999
    Date of Patent: July 8, 2003
    Assignee: Hoya Corporation
    Inventors: Shin-Ichiro Hirota, Yu Oogami, Kazuaki Hashimoto
  • Method of producing a glass optical element capable of suppressing occurrence of a damage of a mold and improving a quality of the glass optical element
    Patent number: 6151915
    Abstract: A mold has a moling surface of a material containing silicon carbide and/or silicon nitride as a main component and a carbon thin film formed on the molding surface to prevent fusion sticking. A glass substance which has a sag point not higher than 565.degree. C. and a predetermined composition free from arsenic oxide is introduced into the mold. The glass substance is press-formed in a heated and softened condition into a glass optical element of high precision.
    Type: Grant
    Filed: September 10, 1998
    Date of Patent: November 28, 2000
    Assignees: Hoya Precision Inc., Hoya Corporation
    Inventors: Shin-Ichiro Hirota, Yu Oogami, Kazuaki Hashimoto
  • Glass composition moldable into an optical element with reduced pull-out
    Patent number: 5919718
    Abstract: A mold has a moling surface of a material containing silicon carbide and/or silicon nitride as a main component and a carbon thin film formed on the molding surface to prevent fusion sticking. A glass substance which has a sag point not higher than 565.degree. C. and a predetermined composition free from arsenic oxide is introduced into the mold. The glass substance is press-formed in a heated and softened condition into a glass optical element of high precision.
    Type: Grant
    Filed: September 18, 1996
    Date of Patent: July 6, 1999
    Assignees: Hoya Precision Inc., Hoya Corporation
    Inventors: Shin-Ichiro Hirota, Yu Oogami, Kazuaki Hashimoto