Patents by Inventor Yasushi Nakatogawa

Yasushi Nakatogawa 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).

  • Patent number: 7496988
    Abstract: A dust separation section is provided at a suction air passage between a suction opening of a vacuum cleaner main body and an intake opening of a motor fan to separate dust sucked from the suction opening with air and a dust collection section provided at the suction air passage for collecting the dust separated from the air from the dust separation section. Moreover, the dust separation section of the electric vacuum cleaner has a dust guiding space adapted to inflow the dust sucked from the suction opening from one end of the dust guiding space and for guiding the dust from an other end of the dust guiding space to the dust collection section, through a dust strike section, by an inertia force, and an air guiding air passage is provided to guide air from a midstream of the dust guiding space to the intake opening of the motor fan without passing through the dust collection section.
    Type: Grant
    Filed: March 18, 2003
    Date of Patent: March 3, 2009
    Assignee: Toshiba Tec Kabushiki Kaisha
    Inventors: Ritsuo Takemoto, Masatoshi Tanaka, Hiroshi Yokoyama, Hitoshi Suzuki, Kiyoshi Ebe, Yoshihiro Tsuchiya, Ai Tanaka, Yasushi Nakatogawa, Ikuo Oshima, Yutaka Maeda
  • Patent number: 7198656
    Abstract: There is disclosed a vacuum cleaner including a dust separation section which separates air and dust flowing toward an intake port of a motor blower through a connection port of a cleaner main body. The dust separation section includes an air path forming member which performs a separation function. The forming member includes an introductory port, a derivative port, and an opening disposed between these. In the separation function, while dust-containing air flows toward the derivative port from the introductory port, a part of the air is sucked by the motor blower through the opening. Accordingly, the air is separated from the dust which goes straight in the air path forming member with inertia.
    Type: Grant
    Filed: March 28, 2005
    Date of Patent: April 3, 2007
    Assignee: Toshiba Tec Kabushiki Kaisha
    Inventors: Ritsuo Takemoto, Masatoshi Tanaka, Hiroshi Yokoyama, Hitoshi Suzuki, Kiyoshi Ebe, Yoshihiro Tsuchiya, Ai Tanaka, Yasushi Nakatogawa, Ikuo Oshima, Yusuke Kinoshita, Yutaka Maeda
  • Publication number: 20050166560
    Abstract: There is disclosed a vacuum cleaner including a dust separation section which separates air and dust flowing toward an intake port of a motor blower through a connection port of a cleaner main body. The dust separation section includes an air path forming member which performs a separation function. The forming member includes an introductory port, a derivative port, and an opening disposed between these. In the separation function, while dust-containing air flows toward the derivative port from the introductory port, a part of the air is sucked by the motor blower through the opening. Accordingly, the air is separated from the dust which goes straight in the air path forming member with inertia.
    Type: Application
    Filed: March 28, 2005
    Publication date: August 4, 2005
    Inventors: Ritsuo Takemoto, Masatoshi Tanaka, Hiroshi Yokoyama, Hitoshi Suzuki, Kiyoshi Ebe, Yoshihiro Tsuchiya, Ai Tanaka, Yasushi Nakatogawa, Ikuo Oshima, Yusuke Kinoshita, Yutaka Maeda
  • Publication number: 20050150075
    Abstract: A dust separation section 60 is provided at a suction air passage leading from a suction opening (connection opening 43 or suction opening 52, suction opening 100) of a vacuum cleaner main body 20 to an intake opening (33A, 107A) of a motor fan (33, 107) to separate a dust sucked from the suction opening (connection opening 43 or suction opening 52, suction opening 100) with an air and a dust collection section (dust collection room section 55, dust collection room 104) provided at the suction air passage for collecting the dust separated from the air from the dust separation section 60.
    Type: Application
    Filed: March 18, 2003
    Publication date: July 14, 2005
    Applicant: Toshiba Tec Kabushiki Kaisha
    Inventors: Ritsuo Takemoto, Masatoshi Tanaka, Hiroshi Yokoyama, Hitoshi Suzuki, Kiyoshi Ebe, Yoshihiro Tsuchiya, Ai Tanaka, Yasushi Nakatogawa, Ikuo Oshima, Yutaka Maeda