Patents by Inventor Sanjiro Nagai

Sanjiro Nagai 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: 5066134
    Abstract: The present invention relates to a fluid agitator which may stir fluid in a closed space without leakage of the fluid. The fluid agitator has a motive means and a bearing means installed in the closed space. In the fluid agitator employing a electric motor as the motive means, only the stator coil of the motor which is weak in its resistance against high temperatures and humid atmosphere is sealed in a sealing chamber. The sealing chamber may be provided with a cooling device to cool the inside thereof. The driving shaft of the motor is supported by a bearing having resistance to high temperatures and high humidity and is provided with an agitating blade. In the fluid agitator employing a turbine system as the motive means, a turbine chamber and a turbine blade are set in the closed space. A fluid supply is furnished to introduce fluid into the turbine chamber from outside of the closed space for driving and rotating the turbine blade.
    Type: Grant
    Filed: August 9, 1990
    Date of Patent: November 19, 1991
    Assignee: Tanken Seiko Kabushiki Kaisha
    Inventors: Hiroshi Ohbori, Yuji Yamauchi, Yataro Nagai, Sanjiro Nagai, Mitsuyoshi Matsushita
  • Patent number: 4982373
    Abstract: The present invention relates to a fluid agitator which may stir fluid in a closed space without leakage of the fluid. The fluid agitator has a motive means and a bearing means installed in the closed space.In the fluid agitator employing a electric motor as the motive means, only the stator coil of the motor which is weak in its resistance against high temperatures and humid atmosphere is sealed in a sealing chamber. The sealing chamber may be provided with a cooling device to cool the inside thereof. The driving shaft of the motor is supported by a bearing having resistance to high temperatures and high humidity and is provided with an agitating blade.In the fluid agitator employing a turbine system as the motive means, a turbine chamber and a turbine blade are set in the closed space. A fluid supply is furnished to introduce fluid into the turbine chamber from outside of the closed space for driving and rotating the turbine blade.
    Type: Grant
    Filed: October 17, 1989
    Date of Patent: January 1, 1991
    Assignee: Tanken Seiko Kabushiki Kaisha
    Inventors: Yataro Nagai, Sanjiro Nagai, Mitsuyoshi Matsushita, Hiroshi Ohbori, Yuji Yamauchi