Patents by Inventor Tomokatsu Oguro

Tomokatsu Oguro 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).

  • Magnetron tubes cathode support
    Patent number: 4169987
    Abstract: The magnetron tube is provided with two concentric supports each with one end connected to the opposite ends of the cathode electrode and two concentric cup shaped input terminals respectively connected to the other ends of the supports. Lead wires extending from a filter for preventing leakage of high frequency wave are welded to the edges of the cup shaped input terminals and clamped thereto at portions near the welded ends by clamping members.
    Type: Grant
    Filed: February 3, 1978
    Date of Patent: October 2, 1979
    Assignee: Hitachi, Ltd.
    Inventors: Tomokatsu Oguro, Yoshio Ishida, Mamoru Tsuzurahara, Satoshi Kobayashi
  • Magnetrons
    Patent number: 4164684
    Abstract: A cylindrical envelope of the magnetron is provided with annular grooves about its periphery and each of the cooling fins and the mounting plate is provided with an annular member press fitted on the envelope and an integral bent rim which engages the groove.
    Type: Grant
    Filed: December 30, 1977
    Date of Patent: August 14, 1979
    Assignee: Hitachi, Ltd.
    Inventor: Tomokatsu Oguro
  • Cathode structure for an electron tube
    Patent number: 4143295
    Abstract: A cathode structure for an electron tube comprises a filament unit and a supporter on which the filament unit is mounted. The filament unit includes a thoriated tungsten wire and a tungsten carbide layer formed by carburizing the surface of the wire, the wire having a diameter of about 0.6 - 0.8 mm and the carbide layer having a thickness of about 5 - 30 .mu., so that the resulting cathode structure enjoys a long life.
    Type: Grant
    Filed: August 3, 1977
    Date of Patent: March 6, 1979
    Assignee: Hitachi, Ltd.
    Inventor: Tomokatsu Oguro
  • Magnetron with cathode end shields coated with secondary electron emission inhibiting material
    Patent number: 3988636
    Abstract: In a magnetron comprising a cathode electrode, an anode electrode surrounding the cathode electrode and end shields mounted on the opposite ends of the cathode electrode, the inner surfaces of one or both end shields are provided with thin layers of a powder of tungsten, molybdenum, or alloys thereof.
    Type: Grant
    Filed: March 26, 1975
    Date of Patent: October 26, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Masami Sato, Hiroshi Hisada, Tomokatsu Oguro