Patents by Inventor Maki Inai

Maki Inai 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).

  • Optical waveguide and process for producing it
    Patent number: 5790726
    Abstract: This invention provides an optical waveguide having diffraction gratings with sufficiently high reflectivity, a waveguide member for obtaining the optical waveguide, and a production process thereof. An optical waveguide in which desired diffraction gratings are formed in a core and in a cladding at a predetermined portion by using a waveguide member in which germanium dioxide is added in the core and in the cladding and irradiating the predetermined portion of the waveguide member with interference fringes of ultraviolet light. By this, the optical waveguide according to the present invention reflects guided light throughout the entire mode field region, thus having a high reflectivity.
    Type: Grant
    Filed: January 28, 1997
    Date of Patent: August 4, 1998
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Masumi Ito, Maki Inai, Akira Inoue, Masakazu Shigehara
  • Optical waveguide and process for producing it
    Patent number: 5627933
    Abstract: This invention provides an optical waveguide having diffraction gratings with sufficiently high reflectivity, a waveguide member for obtaining the optical waveguide, and a production process thereof. An optical waveguide in which desired diffraction gratings are formed in a core and in a cladding at a predetermined portion by using a waveguide member in which germanium dioxide is added in the core and in the cladding and irradiating the predetermined portion of the waveguide member with interference fringes of ultraviolet light. By this, the optical waveguide according to the present invention reflects guided light throughout the entire mode field region, thus having a high reflectivity.
    Type: Grant
    Filed: February 16, 1995
    Date of Patent: May 6, 1997
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Masumi Ito, Maki Inai, Akira Inoue, Masakazu Shigehara