Patents by Inventor Kenzu Ogiwara

Kenzu Ogiwara 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 for switching operation of water wheel or pump water wheel
    Patent number: 4430574
    Abstract: A method for switching the mode of operation of a water wheel or a pump water wheel is disclosed. Water in a runner chamber of the water wheel or the pump water wheel is pushed down below a runner by supplying compressed air to cause a runner to race. When the operation of the water wheel or the pump water wheel is switched from an idling or racing operation of the runner to a generation mode, the characteristics of the water wheel or the pump water wheel and/or a power system are monitored and the monitored characteristics are compared with predetermined values. Based on the compare result, the operation is switched to the generation mode with or without the disconnection of a motor generator coupled to the water wheel or the pump water wheel from the power system.
    Type: Grant
    Filed: August 31, 1981
    Date of Patent: February 7, 1984
    Assignee: Hitachi, Ltd.
    Inventor: Kenzu Ogiwara