Patents by Inventor Tatuo Itou

Tatuo Itou 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 optical wavelength conversion device
    Patent number: 5991490
    Abstract: An optical waveguide of the present invention includes: an optical material; an optical waveguide layer formed in the optical material; and a cladding layer formed on a surface of the optical waveguide layer, wherein the optical waveguide layer is capable of guiding a light beam having a wavelength of .lambda.1 and a light beam having a wavelength of .lambda.2 (.lambda.1>.lambda.2) therethrough, and a refractive index and a thickness of the cladding layer are determined so as to satisfy a guiding condition for the light beam having the wavelength of .lambda.2 and a cutoff condition for the light beam having the wavelength of .lambda.1.
    Type: Grant
    Filed: November 6, 1998
    Date of Patent: November 23, 1999
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kiminori Mizuuchi, Tatuo Itou, Sigeki Ohnishi, Kazuhisa Yamamoto
  • Optical waveguide conversion device
    Patent number: 5872884
    Abstract: An optical waveguide of the present invention includes: an optical material; an optical waveguide layer formed in the optical material; and a cladding layer formed on a surface of the optical waveguide layer, wherein the optical waveguide layer is capable of guiding a light beam having a wavelength of .lambda.1 and a light beam having a wavelength of .lambda.2 (.lambda.1>.lambda.2) therethrough, and a refractive index and a thickness of the cladding layer are determined so as to satisfy a guiding condition for the light beam having the wavelength of .lambda.2 and a cutoff condition for the light beam having the wavelength of .lambda.1.
    Type: Grant
    Filed: December 26, 1996
    Date of Patent: February 16, 1999
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kiminori Mizuuchi, Tatuo Itou, Sigeki Ohnishi, Kazuhisa Yamamoto