Patents by Inventor Yuichi Sirasaki

Yuichi Sirasaki 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).

  • Burying device for submarine cables and method for guiding the same
    Patent number: 4678371
    Abstract: A device for burying a submarine cable under water by easily and accurately detecting the cable position and a method for guiding the same by utilizing the characteristics unique to submarine cables, by supplying an AC only to the portion of the cable between two arbitrary repeaters through a so-called transformer-coupling system to generate an AC magnetic field, and by detecting the magnetic field with a magnetic field detector.
    Type: Grant
    Filed: July 10, 1986
    Date of Patent: July 7, 1987
    Assignee: Kokusai Denshin Denwa Co., Ltd.
    Inventors: Kazuomi Yamamura, Hideo Ishihara, Yoshinao Iwamoto, Shizuo Suzuki, Yuichi Sirasaki, Kenichi Asakawa
  • Apparatus for supplying AC current to an underwater cable
    Patent number: 4625172
    Abstract: A device for burying a submarine cable under water by easily and accurately directing the cable position and a method for guiding the same by utilizing the characteristics unique to submarine cables, by supplying an AC only to the portion of the cable between two arbitrary repeaters through a so-called transformer-coupling system to generate an AC magnetic field, and by detecting the magnetic field with a magnetic field detector.
    Type: Grant
    Filed: June 19, 1985
    Date of Patent: November 25, 1986
    Assignee: Kokusai Denshin Denwa Co., Ltd.
    Inventors: Kazuomi Yamamura, Hideo Ishihara, Yoshinao Iwamoto, Shizuo Suzuki, Yuichi Sirasaki, Kenichi Asakawa
  • Alternating current induction method using an annular magnetic coupling body for detecting the position of a buried submarine cable
    Patent number: 4540942
    Abstract: A device for burying a submarine cable under the water by easily and accurately detecting the cable position and a method for guiding the same by utilizing the characteristics unique to submarine cables, by supplying an AC only to the portion of the cable between two arbitrary repeaters through a so-called transformer-coupling system to generate an AC magnetic field, and by detecting the magnetic field with a magnetic field detector.
    Type: Grant
    Filed: July 13, 1981
    Date of Patent: September 10, 1985
    Assignee: Kokusai Denshin Denwa Co., Ltd.
    Inventors: Kazuomi Yamamura, Hideo Ishihara, Yoshinao Iwamoto, Shizuo Suzuki, Yuichi Sirasaki, Kenichi Asakawa