Patents by Inventor Wakichiro Hishi

Wakichiro Hishi 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 and apparatus for operating vacuum cleaner
    Patent number: 5294872
    Abstract: Method and apparatus for operating a vacuum cleaner in which by detecting a rotational speed of a variable speed fan motor adapted to give a suction force to the cleaner and its change range, the choking state of the filter and the state of the cleaned surface are discriminated, and a speed command of the fan motor is corrected on the basis of the result of the discrimination, and the comfortable cleaning can be performed by the optimum suction force.
    Type: Grant
    Filed: October 4, 1990
    Date of Patent: March 15, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Haruo Koharagi, Kazuo Tahara, Tsunehiro Endo, Kunio Miyashita, Yoshitaro Ishii, Fumio Jyoraku, Syuji Watanabe, Hisanori Toyoshima, Kohichi Saito, Wakichiro Hishi, Koujirou Yamashita
  • Motor control apparatus for an electric vacuum cleaner
    Patent number: 5166585
    Abstract: Method and apparatus for operating a vacuum cleaner in which by detecting a rotational speed of a variable speed fan motor adapted to give a suction force to the cleaner and its change range, the choking state of the filter and the state of the cleaned surface are discriminated, and a speed command of the fan motor is corrected on the basis of the result of the discrimination, and the comfortable cleaning can be performed by the optimum suction force.
    Type: Grant
    Filed: October 4, 1991
    Date of Patent: November 24, 1992
    Assignee: Hitachi, Ltd.
    Inventors: Haruo Koharagi, Kazuo Tahara, Tsunehiro Endo, Kunio Miyashita, Yoshitaro Ishii, Fumio Jyoraku, Syuji Watanabe, Hisanori Toyoshima, Kohichi Saito, Wakichiro Hishi, Koujirou Yamashita
  • Method and apparatus for operating vacuum cleaner
    Patent number: 5075607
    Abstract: Method and apparatus for operating a vacuum cleaner in which by detecting a rotational speed of a variable speed fan motor adapted to give a suction force to the cleaner and its change range, the choking state of the filter and the state of the cleaned surface are discriminated, and a speed command of the fan motor is corrected on the basis of the result of the discrimination, and the comfortable cleaning can be performed by the optimum suction force.
    Type: Grant
    Filed: October 4, 1990
    Date of Patent: December 24, 1991
    Assignee: Hitachi, Ltd.
    Inventors: Haruo Koharagi, Kazuo Tahara, Tsunehiro Endo, Kunio Miyashita, Yoshitaro Ishii, Fumio Jyoraku, Syuji Watanabe, Hisanori Toyoshima, Kohichi Saito, Wakichiro Hishi, Koujirou Yamashita
  • Method and apparatus for operating vacuum cleaner
    Patent number: 4983895
    Abstract: Method and apparatus for operating a vacuum cleaner in which by detecting a rotational speed of a variable speed fan motor adapted to give a suction force to the cleaner and its change range, the choking state of the filter and the state of the cleaner surface are discriminated, and a speed command of the fan motor is corrected on the basis of the result of the discrimination, and the comfortable cleaning can be performed by the optimum suction force.
    Type: Grant
    Filed: June 13, 1989
    Date of Patent: January 8, 1991
    Assignee: Hitachi, Ltd.
    Inventors: Haruo Koharagi, Kazuo Tahara, Tsunehiro Endo, Kunio Miyashita, Yoshitaro Ishii, Fumio Jyoraku, Syuji Watanabe, Hisanori Toyoshima, Kohichi Saito, Wakichiro Hishi, Koujirou Yamashita
  • Method and apparatus for operating vacuum cleaner
    Patent number: 4958406
    Abstract: In a vacuum cleaner comprising an electric blower and a speed control unit to operate the electric blower at a variable speed, a plurality of kinds of operation control rules of the electric blower are previously stored in the speed control unit, a load current value of the electric blower is continuously detected during the cleaning and the type of the surface to be cleaned is estimated from the load current value. Thereafter, the operation control rule suitable for the estimated cleaning surface is selected from the operation control rules stored in the speed control unit and the electric blower is driven on the basis of the selected operation control rule.
    Type: Grant
    Filed: December 14, 1988
    Date of Patent: September 25, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Hisanori Toyoshima, Fumio Jyoraku, Yoshitaro Ishii, Kazuo Tahara, Haruo Koharagi, Syuji Watanabe, Kouichi Saito, Kunio Miyashita, Tunehiro Endo, Wakichiro Hishi
  • Method and apparatus for operating vacuum cleaner
    Patent number: 4880474
    Abstract: Method and apparatus for operating a vacuum cleaner in which by detecting a rotational speed of a variable speed fan motor adapted to give a suction force to the cleaner and its change range, the choking state of the filter and the state of the cleaned surface are discriminated, and a speed command of the fan motor is corrected on the basis of the result of the discrimination, and the comfortable cleaning can be performed by the optimum suction force.
    Type: Grant
    Filed: October 8, 1987
    Date of Patent: November 14, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Haruo Koharagi, Kazuo Tahara, Tsunehiro Endo, Kunio Miyashita, Yoshitaro Ishii, Fumio Jyoraku, Syuji Watanabe, Hisanori Toyoshima, Kohichi Saito, Wakichiro Hishi, Koujirou Yamashita
  • Method and apparatus for operating vacuum cleaner
    Patent number: RE34286
    Abstract: In a vacuum cleaner comprising an electric blower and a speed control unit to operate the electric blower at a variable speed, a plurality of kinds of operation control rules of the electric blower are previously stored in the speed control unit, a load current value of the electric blower is continuously detected during the cleaning and the type of the surface to be cleaned is estimated from the load current value. Thereafter, the operation control rule suitable for the estimated cleaning surface is selected from the operation control rules stored in the speed control unit and the electric blower is driven on the basis of the selected operation control rule.
    Type: Grant
    Filed: September 11, 1991
    Date of Patent: June 22, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Hisanori Toyoshima, Fumio Jyoraku, Yoshitaro Ishii, Kazuo Tahara, Haruo Koharagi, Syuji Watanabe, Kouichi Saito, Kunio Miyashita, Tunehiro Endo, Wakichiro Hishi