Patents by Inventor Naoki Ohkuma

Naoki Ohkuma 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).

  • Flat membrane disk
    Patent number: 6627080
    Abstract: The rotary flat membrane disk is constructed in which circular membranes are stretched at both sides of a disk. The disk and the membrane are bonded to each other over the entire periphery by a peripheral bonding part, and they are also bonded to each other by a plurality of partial bonding parts arranged inside the peripheral bonding part. The partial bonding parts are formed like dots of 10 mm in diameter, and are arranged at every 30 degrees on circles of 500 mm and 600 mm in diameter.
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: September 30, 2003
    Assignee: Hitachi Plant Engineering & Construction Co., Ltd.
    Inventors: Makoto Oonishi, Naoki Ohkuma, Yutaka Okuno, Yukio Murai
  • Rotary flat membrane separation apparatus
    Patent number: 6596164
    Abstract: The rotary flat membrane separation apparatus comprises: a plurality of hollow rotary shafts; a plurality of rotary flat membrane disks mounted on each of the plurality of hollow rotary shafts at regular intervals, the plurality of rotary flat membrane disks mounted on adjacent two of the plurality of hollow rotary shafts being alternately arranged side by side in equal intervals; and a plurality of collars, each of the plurality of collars being arranged between adjacent two of the plurality of rotary flat membrane disks mounted on each of the plurality of hollow rotary shafts. The apparatus is characterized in that a diameter of the collars is between 0.18-0.34 times a diameter of the rotary flat membrane disks. Thus, the effective membrane area can be as large as possible while preventing the vibration of the rotary flat membrane disks caused by the rotation.
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: July 22, 2003
    Assignee: Hitachi Plan Engineering & Construction Co., Ltd.
    Inventors: Makoto Oonishi, Naoki Ohkuma, Yukio Murai, Yutaka Okuno
  • Flat membrane disk
    Publication number: 20010025814
    Abstract: The rotary flat membrane disk is constructed in which circular membranes are stretched at both sides of a disk. The disk and the membrane are bonded to each other over the entire periphery by a peripheral bonding part, and they are also bonded to each other by a plurality of partial bonding parts arranged inside the peripheral bonding part. The partial bonding parts are formed like dots of 10 mm in diameter, and are arranged at every 30 degrees on circles of 500 mm and 600 mm in diameter.
    Type: Application
    Filed: February 21, 2001
    Publication date: October 4, 2001
    Applicant: Hitachi Plant Engineering Consruction Co. LTD.
    Inventors: Makoto Oonishi, Naoki Ohkuma, Yutaka Okuno, Yukio Murai
  • Rotary flat membrane separation apparatus
    Publication number: 20010023844
    Abstract: The rotary flat membrane separation apparatus comprises: a plurality of hollow rotary shafts; a plurality of rotary flat membrane disks mounted on each of the plurality of hollow rotary shafts at regular intervals, the plurality of rotary flat membrane disks mounted on adjacent two of the plurality of hollow rotary shafts being alternately arranged side by side in equal intervals; and a plurality of collars, each of the plurality of collars being arranged between adjacent two of the plurality of rotary flat membrane disks mounted on each of the plurality of hollow rotary shafts. The apparatus is characterized in that a diameter of the collars is between 0.18-0.34 times a diameter of the rotary flat membrane disks. Thus, the effective membrane area can be as large as possible while preventing the vibration of the rotary flat membrane disks caused by the rotation.
    Type: Application
    Filed: February 21, 2001
    Publication date: September 27, 2001
    Inventors: Makoto Oonishi, Naoki Ohkuma, Yukio Murai, Yutaka Okuno