Patents by Inventor Keiji Uemura

Keiji Uemura 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: 6142312
    Abstract: A membrane separation device includes a washing apparatus and a membrane module. The washing apparatus is formed of a vessel for accommodating the membrane module therein, a first tank and a second tank for accommodating washing liquid for washing the membrane module in the vessel and connected to the vessel, a compressed gas feeding device connected to the first and second tanks for selectively feeding compressed gas into the first and second tanks to flow out the liquid therefrom, and conduits connected among the vessel, first and second tanks, and compressed gas feeding device. A conduit selecting device is attached to the conduits for feeding the washing liquid in one of first and second paths. In the first path, the compressed gas in the compressed gas feeding device is fed into the first tank, and the liquid in the first tank is fed into the vessel through the liquid inlet to wash the membrane module accommodated therein and is led to the second tank.
    Type: Grant
    Filed: October 20, 1998
    Date of Patent: November 7, 2000
    Assignee: Kurita Water Industries Ltd.
    Inventor: Keiji Uemura
  • Patent number: 5858229
    Abstract: A spiral wound type membrane module is formed by winding membranes onto a shaft by way of outer spacers. An inner spacer is inserted into the membrane. Raw water is fed from one end of a membrane roll into channels between the membranes. The raw water flows in a direction substantially parallel to the axis of the roll and is taken out from the other end of the roll as nonpermeated water. Water permeated through the membranes flows in the membranes spirally in the winding direction and is taken out from the opening formed on the circumference of the roll.
    Type: Grant
    Filed: July 17, 1997
    Date of Patent: January 12, 1999
    Assignee: Kurita Water Industries Ltd.
    Inventors: Keiji Uemura, Hirotake Shigemi
  • Patent number: 4731181
    Abstract: A module of membranes for permeatingly treating fluid to be treated is housed in a pressure vessel, and, in this pressure vessel, a device for feeding the fluid to be treated is integrally connected to this pressure vessel. The pressure vessel has devices for taking the permeated fluid and the thickened fluid out of the module, respectively.
    Type: Grant
    Filed: May 20, 1986
    Date of Patent: March 15, 1988
    Assignee: Kurita Water Industries Ltd.
    Inventor: Keiji Uemura