Patents by Inventor Yoshinao Iwamoto

Yoshinao Iwamoto 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).

  • System for detecting a cable buried under the seabed
    Patent number: 4438401
    Abstract: A cable buried under a sea bottom is located by causing to flow in the cable an AC current, and measuring the magnetic flux near the cable.
    Type: Grant
    Filed: July 10, 1980
    Date of Patent: March 20, 1984
    Assignee: Kokusai Denshin Denwa Co., Ltd.
    Inventors: Yoshinao Iwamoto, Shizuo Suzuki, Yuichi Shirasaki
  • Under-water cable burying device
    Patent number: 4384808
    Abstract: The present invention has an object to provide an underwater cable burying device which can accurately be guided to align with the cables in the process of burying even if the cables have to be re-buried. The device according to the present invention is characterized in that a travelling device is provided on the body of the device which is further provided with a trenching device at the middle portion thereof, that a cable clamp member and a cable engaging member are provided at an arm projecting forward from the said device body and that said respective devices are controlled through a control cable on the mother ship.
    Type: Grant
    Filed: April 2, 1981
    Date of Patent: May 24, 1983
    Assignee: Kokusai Denshin Denwa Co., Ltd.
    Inventors: Kazuomi Yamamura, Yoshinao Iwamoto, Hifumi Sakaguchi, Kenichi Asakawa
  • Buried cable locating system
    Patent number: 4317079
    Abstract: A cable buried under a sea bottom is located by flowing in the cable an electrical current, and measuring the magnetic flux by said current at four points near the cable.
    Type: Grant
    Filed: September 4, 1979
    Date of Patent: February 23, 1982
    Assignee: Kokusai Denshin Denwa Co. Ltd.
    Inventors: Kazuomi Yamamura, Takasuke Fukui, Yoshinao Iwamoto, Yuichi Shirasaki, Masayuki Fujise
  • Frequency selective detecting system for detecting alternating magnetic fields
    Patent number: 3983475
    Abstract: A system for detecting an AC magnetic field of a desired frequency using a magnetic sensing element of the parametrically excited second harmonic oscillator, in which a reference signal having a repetition period substantially equal to the repetition period of the AC magnetic field is adopted for synchronous detection of the detected output of the magnetic sensing element, and in which a current proportional to the intensity of a noise magnetic field is applied to the oscillation winding of the magnetic sensing element to lessen the influence of the noise magnetic field to greatly improve the SN ratio of the detected signal.
    Type: Grant
    Filed: December 30, 1974
    Date of Patent: September 28, 1976
    Assignee: Kokusai Denshin Denwa Kabushiki Kaisha
    Inventors: Teruji Watanabe, Shizuo Suzuki, Kazuomi Yamamura, Yoshinao Iwamoto