Patents by Inventor Masafumi Nakatsuka

Masafumi Nakatsuka 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).

  • Method of measuring hydrogen concentration in member and device of measuring hydrogen concentration
    Patent number: 7930925
    Abstract: An art of hydrogen concentration measurement in which the hydrogen concentration of any given location of an object to be measured can be nondestructively obtained is provided.
    Type: Grant
    Filed: March 16, 2006
    Date of Patent: April 26, 2011
    Assignee: Global Nuclear Fuel-Japan Co., Ltd.
    Inventors: Yoshiaki Ishii, Akihiro Miyazaki, Masafumi Nakatsuka, Shinji Ishimoto
  • METHOD OF MEASURING HYDROGEN CONCENTRATION IN MEMBER AND DEVICE OF MEASURING HYDROGEN CONCENTRATION
    Publication number: 20090056415
    Abstract: An art of hydrogen concentration measurement in which the hydrogen concentration of any given location of an object to be measured can be nondestructively obtained is provided.
    Type: Application
    Filed: March 16, 2006
    Publication date: March 5, 2009
    Applicants: The Tokyo Electric Power Company, Incorporated, Global Nuclear Fuel-Japan Co., Ltd.
    Inventors: Yoshiaki Ishii, Akihiro Miyazaki, Masafumi Nakatsuka, Shinji Ishimoto
  • Method of measuring hydrogen concentration of radioactive metallic material
    Patent number: 6640635
    Abstract: Electromagnetic acoustic resonance method by using EMAT is used for determining hydrogen concentration of radioactive metallic object. In one preferred embodiment, resonance frequencies fr, fr are measured with the EMAT, where where fr is a resonance frequency when a direction of an amplitude of a transverse ultrasonic wave generated by the EMAT is the same as the rolling direction of the metallic object of rolled material, and ft is a resonance frequency when a direction of the amplitude of the transverse ultrasonic wave is perpendicular to the rolling direction. A value R is calculated by using: R=(fr−ft)/{(fr+ft)/2}. The hydrogen concentration of the metallic object is calculated on the basis of the experimentally determined relation between the value R and hydrogen concentration.
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: November 4, 2003
    Assignees: Kabushiki Kaisha Toshiba, Hitachi Ltd., Nippon Nuclear Fuel Development Co., Ltd.
    Inventor: Masafumi Nakatsuka
  • Method of measuring hydrogen concentration of radioactive metallic material
    Publication number: 20020069703
    Abstract: Electromagnetic acoustic resonance method by using EMAT is used for determining hydrogen concentration of radioactive metallic object. In one preferred embodiment, resonance frequencies fr, fr are measured with the EMAT, where where fr is a resonance frequency when a direction of an amplitude of a transverse ultrasonic wave generated by the EMAT is the same as the rolling direction of the metallic object of rolled material, and ft is a resonance frequency when a direction of the amplitude of the transverse ultrasonic wave is perpendicular to the rolling direction. A value R is calculated by using: R=(fr−ft)/{(fr+ft)/2}. The hydrogen concentration of the metallic object is calculated on the basis of the experimentally determined relation between the value R and hydrogen concentration.
    Type: Application
    Filed: December 11, 2001
    Publication date: June 13, 2002
    Applicant: KABUSHIKI KAISHA TOSHIBA, HITACHI LTD.
    Inventor: Masafumi Nakatsuka