Patents by Inventor Tohru Nishikawa

Tohru Nishikawa 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).

  • Bidirectional optical semiconductor apparatus
    Publication number: 20010033719
    Abstract: A bidirectional optical semiconductor apparatus of the present invention includes: a substrate embedding an optical waveguide, through which output light and input light are propagated; a semiconductor light-emitting device for emitting the output light toward one end of the optical waveguide; an optical branching filter, provided in the optical waveguide, for transmitting at least part of the output light and guiding at least part of the input light to the outside of the optical waveguide; a semiconductor light-receiving device, provided over the substrate, for receiving the input light guided by the optical branching filter to the outside of the optical waveguide; and a light-blocking member, formed on the surface of the semiconductor light-receiving device, for blocking the light emitted from the semiconductor light-emitting device.
    Type: Application
    Filed: June 25, 2001
    Publication date: October 25, 2001
    Inventors: Masahiro Mitsuda, Tohru Nishikawa, Tomoaki Uno
  • Bidirectional optical semiconductor apparatus
    Patent number: 6264377
    Abstract: EA bidirectional optical semiconductor apparatus of the present invention includes: a substrate embedding an optical waveguide, through which output light and input light are propagated; a semiconductor light-emitting device for emitting the output light toward one end of the optical waveguide; an optical branching filter, provided in the optical waveguide, for transmitting at least part of the output light and guiding at least part of the input light to the outside of the optical waveguide; a semiconductor light-receiving device, provided over the substrate, for receiving the input light guided by the optical branching filter to the outside of the optical waveguide; and a light-blocking member, formed on the surface of the semiconductor light-receiving device, for blocking the light emitted from the semiconductor light-emitting device.
    Type: Grant
    Filed: March 3, 1999
    Date of Patent: July 24, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masahiro Mitsuda, Tohru Nishikawa, Tomoaki Uno
  • Bidirectional optical semiconductor apparatus
    Publication number: 20010000621
    Abstract: A bidirectional optical semiconductor apparatus of the present invention includes: a substrate embedding an optical waveguide, through which output light and input light are propagated; a semiconductor light-emitting device for emitting the output light toward one end of the optical waveguide; an optical branching filter, provided in the optical waveguide, for transmitting at least part of the output light and guiding at least part of the input light to the outside of the optical waveguide; a semiconductor light-receiving device, provided over the substrate, for receiving the input light guided by the optical branching filter to the outside of the optical waveguide; and a light-blocking member, formed on the surface of the semiconductor light-receiving device, for blocking the light emitted from the semiconductor light-emitting device.
    Type: Application
    Filed: December 7, 2000
    Publication date: May 3, 2001
    Inventors: Masahiro Mitsuda, Tohru Nishikawa, Tomoaki Uno
  • 1,1,2,2-tetramethylpropylperoxy esters and method for preparing vinyl polymers
    Patent number: 5783647
    Abstract: Novel 1,1,2,2-tetramethylpropylperoxy esters are provided. They are useful as a polymerization initiator in polymerizing vinyl chloride, vinylidene chloride and vinyl acetate monomers, with the advantage of completing polymerization within a short time.
    Type: Grant
    Filed: December 4, 1995
    Date of Patent: July 21, 1998
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Takashi Kobayashi, Tadashi Amano, Hideshi Kurihara, Toshio Shinohara, Yoshitaka Okuno, Tohru Nishikawa
  • Silicon-containing peroxyesters
    Patent number: 5728857
    Abstract: Silicon-containing peroxyester compounds, for example, represented by the following formula: ##STR1## useful as a polymerization initiator, which compounds can produce vinyl chloride polymers having a high quality in a high yield and in a short reaction time.
    Type: Grant
    Filed: March 7, 1997
    Date of Patent: March 17, 1998
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Takashi Kobayashi, Tadashi Amano, Hideshi Kurihara, Tomohisa Suzuki, Toshio Shinohara, Tohru Nishikawa