Patents by Inventor Susumu Tukamoto

Susumu Tukamoto 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).

  • Electron beam welding method
    Patent number: 4673794
    Abstract: For carrying out electron beam welding, there is formed by means of a magnetic or electric field set up by an even number of at least two magnetic poles or electrodes, an electron beam, the pattern of which has elliptical or similar shaped cross sections. Electron beam welding is performed using such an electron beam. The direction of the major axis of the cross section of the electron beam at the surface of the material being welded and the direction of the major axis of the cross section of the electron beam at the bottom of the beam cavity, i.e., the root portion, are at right angles to each other.
    Type: Grant
    Filed: March 25, 1986
    Date of Patent: June 16, 1987
    Assignee: National Research Institute for Metals
    Inventors: Hirosada Irie, Susumu Tukamoto
  • Method and apparatus for electron beam welding
    Patent number: 4309589
    Abstract: A method and an apparatus for electron beam welding, in which the oscillation of the focus of an electron beam which is due to the pulsation of a direct-current high voltage for accelerating electrons is detected, and the electron beam is controlled according to the detected oscillation of the focus of the electron beam.
    Type: Grant
    Filed: March 21, 1979
    Date of Patent: January 5, 1982
    Assignee: National Research Institute for Metals
    Inventors: Tatsuya Hashimoto, Michio Inagaki, Hirosada Irie, Susumu Tukamoto