Patents by Inventor Norimitu Kuwabara

Norimitu Kuwabara 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).

  • Underground drainage facility and operation method therefor
    Patent number: 5228802
    Abstract: A drainage system comprises a drainage passage for a drain water, a pump for pumping up the drain water from the drainage passage to a drain portion which is arranged above the drainage passage, and a storage tank which has an inlet connected to the drainage passage to receive the drain water therethough from the drainage passage into the storage tank, and a height of the inlet is higher than that of the drainage passage and lower than that of the drain portion so that an ascent of upper surface of the drain water from the drainage passage is restrained after the drain water ascends to the inlet from the drainage passage.
    Type: Grant
    Filed: June 11, 1992
    Date of Patent: July 20, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Norimitu Kuwabara, Kenji Otani