Patents by Inventor Takeji Akutsu

Takeji Akutsu 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 fiber
    Patent number: 8532455
    Abstract: An optical fiber includes a core (1a) having an oblong rectangular or square cross section and made of quartz, a cladding (2) surrounding the core (1a), having a circular outer cross-sectional shape, having a lower refractive index than the core (1a), and made of resin, and a support layer (3) surrounding the cladding (2) and made of quartz.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: September 10, 2013
    Assignee: Mitsubishi Cable Industries, Ltd.
    Inventors: Tadahiko Nakai, Takaharu Kinoshita, Takeshi Satake, Takeji Akutsu, Motohiko Yamasaki
  • Optical fiber and method for fabricating the same
    Patent number: 8059930
    Abstract: An optical fiber includes a core (1a) having an oblong rectangular or square cross section and made of quartz, and a cladding (2) surrounding the core (1a), having a circular outer cross-sectional shape, and made of resin.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: November 15, 2011
    Assignee: Mitsubishi Cable Industries, Ltd.
    Inventors: Tadahiko Nakai, Takaharu Kinoshita, Takeshi Satake, Takeji Akutsu, Motohiko Yamasaki
  • Laser guide optical fiber and laser guide including the same
    Patent number: 8023785
    Abstract: A laser guide optical fiber (100) used for transmitting a laser beam includes an optical fiber body (110) including a core (111) and a clad (112), and a quartz chip (120) integrally provided at an end surface on the light entering side of the optical fiber body (110) and including an optical waveguide portion, where at least the optical waveguide portion of the quartz chip (120) is made of pure quartz. The quartz chip (120) includes a light entering surface subjected to surface fusion treatment.
    Type: Grant
    Filed: March 10, 2008
    Date of Patent: September 20, 2011
    Assignee: Mitsubishi Cable Industries, Ltd.
    Inventors: Takeshi Satake, Takeji Akutsu, Motohiko Yamasaki
  • OPTICAL FIBER AND METHOD FOR FABRICATING THE SAME
    Publication number: 20100278503
    Abstract: An optical fiber includes a core (1a) having an oblong rectangular or square cross section and made of quartz, and a cladding (2) surrounding the core (1a), having a circular outer cross-sectional shape, and made of resin.
    Type: Application
    Filed: December 19, 2008
    Publication date: November 4, 2010
    Inventors: Tadahiko Nakai, Takaharu Kinoshita, Takeshi Satake, Takeji Akutsu, Motohiko Yamasaki
  • LASER GUIDE OPTICAL FIBER AND LASER GUIDE INCLUDING THE SAME
    Publication number: 20100111474
    Abstract: A laser guide optical fiber (100) used for transmitting a laser beam includes an optical fiber body (110) including a core (111) and a clad (112), and a quartz chip (120) integrally provided at an end surface on the light entering side of the optical fiber body (110) and including an optical waveguide portion, where at least the optical waveguide portion of the quartz chip (120) is made of pure quartz. The quartz chip (120) includes a light entering surface subjected to surface fusion treatment.
    Type: Application
    Filed: March 10, 2008
    Publication date: May 6, 2010
    Inventors: Takeshi Satake, Takeji Akutsu, Motohiko Yamasaki
  • Optical energy beam transmission path structure
    Patent number: 5177808
    Abstract: The present invention provides an optical energy beam transmission path structure comprising at least one pair of optical fibers each having a connection end, and at least one fiber connector for connecting the connection ends of the paired fibers substantially coaxially. A small axial air gap is formed between the connection ends of the paired fibers, and an annular clearance is formed immediately around the connection end of the glass body of each fiber.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: January 5, 1993
    Assignees: Mitsubishi Jukogyo Kabushiki Kaisha, Mitsubishi Cable Industries, Ltd.
    Inventors: Takeshi Satake, Tokuji Hayashi, Masayoshi Hachiwaka, Masakatsu Kimura, Koichi Suzuki, Takeji Akutsu, Yoshimasa Tsukamoto, Isao Shirasu
  • “Optical fiber cable”
    Patent number: D742327
    Type: Grant
    Filed: February 19, 2013
    Date of Patent: November 3, 2015
    Assignee: MITSUBISHI CABLE INDUSTRIES, LTD.
    Inventors: Tadahiko Nakai, Takeji Akutsu, Takeshi Satake