Patents by Inventor Mitugu Takahasi

Mitugu Takahasi 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).

  • Switch and arc extinguishing material for use therein
    Patent number: 5990440
    Abstract: A switch containing a switch case, contacts adapted to be opened and closed, an arc extinguishing chamber disposed in the vicinity of the contacts, and an arc extinguishing material capable of reducing the amount of metal particles and free carbons to be scattered from components disposed within the switch by an arc generated when the contacts are opened or closed or capable of insulating the metal particles and the free carbons to convert into an insulator, thereby inhibiting a decrease in arc resistance expected to occur upon the generation and extinction of the arc and a decrease in insulation resistance expected to occur within and around the arc extinguishing chamber and at inner wall surfaces of the switch case upon and after the extinction of the arc.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: November 23, 1999
    Assignee: Mitsubishi denki Kabushiki Kaisha
    Inventors: Shoji Yamaguchi, Itsuo Nishiyama, Fumiaki Baba, Mitugu Takahasi, Takao Mitsuhashi, Kazuharu Kato, Osamu Hiroi, Tadaki Murakami, Hiroshi Adachi, Kenichi Nishina, Kazunori Fukuya, Shinji Yamagata, Shunichi Katsube
  • Switch and arc extinguishing material for use therein
    Patent number: 5841088
    Abstract: A switch comprising a switch case, contacts adapted to be opened and closed, an arc extinguishing chamber disposed in the vicinity of the contacts, and an arc extinguishing material capable of reducing the amount of metal particles and free carbons to be scattered from components disposed within the switch by an arc generated when the contacts are opened or closed or capable of insulating the metal particles and the free carbons to convert into an insulator, thereby inhibiting a decrease in arc resistance expected to occur upon the generation and extinction of the arc and a decrease in insulation resistance expected to occur within and around the arc extinguishing chamber and at inner wall surfaces of the switch case upon and after the extinction of the arc.
    Type: Grant
    Filed: March 7, 1995
    Date of Patent: November 24, 1998
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shoji Yamaguchi, Itsuo Nishiyama, Fumiaki Baba, Mitugu Takahasi, Takao Mitsuhashi, Kazuharu Kato, Osamu Hiroi, Tadaki Murakami, Hiroshi Adachi, Kenichi Nishina, Kazunori Fukuya, Shinji Yamagata, Shunichi Katsube