Patents by Inventor Yasunobu Okajima

Yasunobu Okajima 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).

  • Publication number: 20200289988
    Abstract: Provided is a method for cleaning a filtration membrane provided in a membrane filtration device that is immersed in a liquid to be treated and performs solid-liquid separation on the liquid to be treated. When a transmembrane pressure difference exceeds a first predetermined pressure difference P1, a first cleaning step W1 for cleaning a filtration membrane is performed using a first chemical solution; when the transmembrane pressure difference immediately after performing the first cleaning step W1 exceeds a second predetermined pressure difference P2 that is lower than the first predetermined pressure difference, a second cleaning step W2 for cleaning the filtration membrane is performed using a second chemical solution having a concentration higher than the first chemical solution; and when the second cleaning step W2 is performed, the concentration of the second chemical solution and/or the cleaning time is changed according to the temperature of the liquid to be treated.
    Type: Application
    Filed: May 29, 2020
    Publication date: September 17, 2020
    Inventors: Yasunobu OKAJIMA, Yuki KAWASHIMA, Yuji OTSUKA, Yukako MORITA, Ken TANAKA
  • Patent number: 10549957
    Abstract: A lifting set includes a lifting apparatus and a water treatment device. In lifting the water treatment device, an engaging member attached to a first attaching position of a frame of the lifting apparatus pivots in a first direction by sliding along a corresponding engageable portion of the water treatment device as the lifting apparatus approaches the water treatment device, and then automatically engages with the engageable portion by pivoting back to a vertical position by weight thereof while the lifting apparatus is further lowered. In installing the water treatment device, the engaging member attached to a second attaching position engages with the engageable portion at a pivoted position pivoted in a second direction, and when the lifting apparatus is further lowered after installation, the engaging member automatically disengages from the corresponding engageable portion by pivoting back from the second pivoted position to the vertical position by weight thereof.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: February 4, 2020
    Assignee: Kubota Corporation
    Inventors: Yasunobu Okajima, Tadao Shinkai
  • Patent number: 10328394
    Abstract: A low-cost membrane cartridge and a low-cost method for producing a membrane cartridge, in which fatigue durability can be increased with a simple structure, are provided by focusing on a bonding position of the filtration membrane onto the filtration plate. The membrane cartridge includes a filtration membrane disposed on both faces of a filtration plate made of a thermoplastic resin, such that a joining portion provided at the periphery of the filtration membrane is joined to the filtration plate. At least an inner edge portion of the joining portion has a downward inclination with respect to the surface of the filtration plate inside of the inner edge portion at an angle in a range of 10 to 45 degrees toward an outer peripheral edge of the filtration membrane. The joining portion is pressed and welded using a heating plate or an ultrasonic horn having such an inclined surface.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: June 25, 2019
    Assignee: Kubota Corporation
    Inventors: Kimihiro Ishikawa, Motofumi Tajima, Makoto Takahashi, Kenichi Ohnishi, Yasunobu Okajima
  • Publication number: 20190119077
    Abstract: A lifting set includes a lifting apparatus and a water treatment device. In lifting the water treatment device, an engaging member attached to a first attaching position of a frame of the lifting apparatus pivots in a first direction by sliding along a corresponding engageable portion of the water treatment device as the lifting apparatus approaches the water treatment device, and then automatically engages with the engageable portion by pivoting back to a vertical position by weight thereof while the lifting apparatus is further lowered. In installing the water treatment device, the engaging member attached to a second attaching position engages with the engageable portion at a pivoted position pivoted in a second direction, and when the lifting apparatus is further lowered after installation, the engaging member automatically disengages from the corresponding engageable portion by pivoting back from the second pivoted position to the vertical position by weight thereof.
    Type: Application
    Filed: December 20, 2018
    Publication date: April 25, 2019
    Inventors: Yasunobu OKAJIMA, Tadao SHINKAI
  • Publication number: 20190091632
    Abstract: A method for operating a membrane separation device includes (a) setting a flow amount M(t) of permeated water and extracting the permeated water from the membrane separation device by the set flow amount M(t), and (b) temporarily stopping the extracting the permeated water, when a water level of a first water tank in which the membrane separation device is immersed, a water level of a second water tank in communication with the first tank, or a water level of a third water tank receiving overflowing water from the first water tank becomes lower than a predetermined halt water level. M(t), which is the flow amount of the permeated water during a time period t, satisfies a equation M(t)=KQ(t?1), where K is a gain (K>1), and Q(t?1) is an amount of inflow of the water-to-be-treated during a time period t?1 immediately prior to the time period t.
    Type: Application
    Filed: November 28, 2018
    Publication date: March 28, 2019
    Inventors: Yasunobu OKAJIMA, Kimihiro ISHIKAWA
  • Patent number: 10106440
    Abstract: A membrane separation device is provided with membrane modules comprising multiple membrane elements, a frame body accommodating the membrane modules stacked in multiple stages, a stopper for closing an end portion of the frame body to prevent the membrane modules accommodated in the frame from being released, and elastic members which, arranged in a state of elastic deformation in the vertical direction in the frame with the end portion of the frame being closed, suppress vertical vibration of the membrane modules accommodated in the frame, whereby making it possible to avoid vibration of the membrane modules inside the frame body even if the volume of the membrane modules accommodated in the frame body varies.
    Type: Grant
    Filed: July 17, 2013
    Date of Patent: October 23, 2018
    Assignee: Kubota Corporation
    Inventors: Hidetoshi Masutani, Yasunobu Okajima
  • Patent number: 10071924
    Abstract: A diffusion pipe is provided in which the air diffusion efficiency can be quickly recovered just after conducting a cleaning process for the diffusion pipe with a cleaning solution supplied into the membrane support body, and in which air diffusion is evenly and constantly provided. The diffusion pipe includes a membrane body made of a viscoelastic material and formed in a tubular shape having an inner surface and an outer surface, and a tubular membrane support body that supports the membrane body from inside of the membrane body. The membrane body has a plurality of diffusion slits cutting therethrough between the outer surface and the inner surface. The membrane support body has through-holes on an upper side and a lower side thereof. The diffusion slits are not provided in a region of the membrane body corresponding to the through-holes.
    Type: Grant
    Filed: May 11, 2016
    Date of Patent: September 11, 2018
    Assignee: Kubota Corporation
    Inventors: Yasunobu Okajima, Kazuo Nanri
  • Patent number: 10040701
    Abstract: A membrane separation device includes a plurality of membrane elements each having a separation membrane arranged on front and back sides of a flat filter plate, wherein the membrane elements are oriented vertically and arranged in an array separated by a fixed distance such that the separation membranes are facing one another. A narrowing member is provided outside of the membrane element arranged at the outermost position along the arrangement direction, the narrowing member being disposed at least in a vicinity of a bonding portion of the filter plate and the separation membrane along the vertical direction thereof so as to be separated from the outermost membrane element by a predetermined distance smaller than the fixed distance T, thereby avoiding rupture of the separation membrane provided on outer side of the outermost membrane element even if aeration is continued in a state in which the filtering operation is stopped.
    Type: Grant
    Filed: July 17, 2013
    Date of Patent: August 7, 2018
    Assignee: Kubota Corporation
    Inventors: Hidetoshi Masutani, Yasunobu Okajima
  • Patent number: 9873089
    Abstract: A method for lifting a membrane separation device immersed in liquid to be treated so as to obtain permeated liquid passed through a filtration membrane provides a method for lifting the membrane separation device in a visible state without lowering the liquid level of a treatment tank. The method includes injecting a gas into a predetermined region of the membrane separation device, thereby raising the membrane separation device by a buoyancy generated by the injected gas through the liquid to be treated, and engaging an engaging portion of a lifting apparatus with an engageable portion provided to an upper portion of the membrane separation device, thereby lifting up the membrane separation device. The predetermined region may be a space constituting a flow path for the permeated liquid permeated through the filtration membrane.
    Type: Grant
    Filed: May 17, 2016
    Date of Patent: January 23, 2018
    Assignee: Kubota Corporation
    Inventors: Yasunobu Okajima, Tadao Shinkai
  • Publication number: 20160256832
    Abstract: A method for lifting a membrane separation device immersed in liquid to be treated so as to obtain permeated liquid passed through a filtration membrane provides a method for lifting the membrane separation device in a visible state without lowering the liquid level of a treatment tank. The method includes injecting a gas into a predetermined region of the membrane separation device, thereby raising the membrane separation device by a buoyancy generated by the injected gas through the liquid to be treated, and engaging an engaging portion of a lifting apparatus with an engageable portion provided to an upper portion of the membrane separation device, thereby lifting up the membrane separation device. The predetermined region may be a space constituting a flow path for the permeated liquid permeated through the filtration membrane.
    Type: Application
    Filed: May 17, 2016
    Publication date: September 8, 2016
    Inventors: Yasunobu OKAJIMA, Tadao SHINKAI
  • Publication number: 20160251246
    Abstract: A diffusion pipe is provided in which the air diffusion efficiency can be quickly recovered just after conducting a cleaning process for the diffusion pipe with a cleaning solution supplied into the membrane support body, and in which air diffusion is evenly and constantly provided. The diffusion pipe includes a membrane body made of a viscoelastic material and formed in a tubular shape having an inner surface and an outer surface, and a tubular membrane support body that supports the membrane body from inside of the membrane body. The membrane body has a plurality of diffusion slits cutting therethrough between the outer surface and the inner surface. The membrane support body has through-holes on an upper side and a lower side thereof. The diffusion slits are not provided in a region of the membrane body corresponding to the through-holes.
    Type: Application
    Filed: May 11, 2016
    Publication date: September 1, 2016
    Inventors: Yasunobu OKAJIMA, Kazuo NANRI
  • Publication number: 20160016762
    Abstract: A lifting apparatus capable of engaging with and disengaging from a water treatment device which is to be lifted without cumbersome manual operations is provided. The lifting apparatus includes a frame and an engaging portion pivotably attached to the frame by an upper portion thereof in a vertical position. The engaging potion is capable of engaging with an engageable portion of the water treatment device. The engaging portion is configured to be set to a first operation state in which the engaging portion pivots by contacting the engageable portion as the lifting apparatus approaches the water treatment device from above, and then pivots back to the vertical position as the lifting apparatus further approaches the water treatment device to become closer thereto, whereby the engaging portion and the engageable portion become engageable with each other.
    Type: Application
    Filed: September 25, 2015
    Publication date: January 21, 2016
    Inventors: Yasunobu OKAJIMA, Tadao SHINKAI
  • Publication number: 20160016833
    Abstract: An organic wastewater treatment apparatus includes (a) a treatment tank, (b) a plurality of membrane separation devices immersed in the treatment tank, where each membrane separation device is provided with a diffuser device and a permeated liquid extracting device, (c) a plurality of sludge characteristics measuring devices dispersedly disposed in the treatment tank, and (d) a controller. An operating method divides the treatment tank into a plurality of regions, and sets at least one of an amount of air diffusion and a flow rate of permeated liquid for each membrane separation device based on a measured value of the sludge characteristics measuring device disposed in the corresponding region. The controller sets at least one of the amount of air diffusion and the flow rate of permeated liquid based on the measured value of the sludge characteristics measuring device in a vicinity of which the membrane separation device is disposed.
    Type: Application
    Filed: September 25, 2015
    Publication date: January 21, 2016
    Inventors: Yasunobu OKAJIMA, Yukako MORITA, Yuji OHTSUKA
  • Publication number: 20160016123
    Abstract: A low-cost membrane cartridge and a low-cost method for producing a membrane cartridge, in which fatigue durability can be increased with a simple structure, are provided by focusing on a bonding position of the filtration membrane onto the filtration plate. The membrane cartridge includes a filtration membrane disposed on both faces of a filtration plate made of a thermoplastic resin, such that a joining portion provided at the periphery of the filtration membrane is joined to the filtration plate. At least an inner edge portion of the joining portion has a downward inclination with respect to the surface of the filtration plate inside of the inner edge portion at an angle in a range of 10 to 45 degrees toward an outer peripheral edge of the filtration membrane. The joining portion is pressed and welded using a heating plate or an ultrasonic horn having such an inclined surface.
    Type: Application
    Filed: September 25, 2015
    Publication date: January 21, 2016
    Inventors: Kimihiro ISHIKAWA, Motofumi TAJIMA, Makoto TAKAHASHI, Kenichi OHNISHI, Yasunobu OKAJIMA
  • Patent number: 8764982
    Abstract: Disclosed is a membrane separation device comprising a plurality of flat membrane elements (52) arranged in parallel to one another so as to form channels for a solution to be treated therebetween, and a collecting case (59) having a collecting space that is formed internally and communicates with filtrate flow channels of the membrane elements (52). The collecting case (59) includes a membrane element holder (53) having a plurality of slits, into which the sides of respective membrane elements (52) are inserted, and a stopper (58) which abuts on the membrane element holder (53) in the collecting case (59), and a filler (55) is provided in the slits to attach and watertightly seal between the membrane elements (52) and the membrane element holder (53).
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: July 1, 2014
    Assignee: Kubota Corporation
    Inventors: Tomokazu Kitano, Hidetoshi Masutani, Yasunobu Okajima
  • Patent number: 8741141
    Abstract: The wall member of a water collecting case forms a projecting portion projecting to the outer side and recessed portions recessed to the inner side.
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: June 3, 2014
    Assignee: Kubota Corporation
    Inventors: Hidetoshi Masutani, Yasunobu Okajima, Tomokazu Kitano
  • Patent number: 8728314
    Abstract: A membrane element is provided between a pair of water collecting cases. Water collecting spaces in which permeate having penetrated through the membrane element is collected are formed in the water collecting cases. The water collecting case of one membrane module and the water collecting case of the other membrane module are coupled via coupling portions. The coupling portions have flow holes. The water collecting space of the water collecting case of the one membrane module and the water collecting space of the water collecting case of the other membrane module communicate with each other via the flow holes of the coupling portions.
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: May 20, 2014
    Assignee: Kubota Corporation
    Inventors: Hidetoshi Masutani, Yasunobu Okajima, Tomokazu Kitano
  • Patent number: 8616534
    Abstract: A diffuser tube is capable of preventing sludge from entering the tube when a diffusion operation is not performed, thereby preventing clogging of diffusion holes and inside of the tube and reducing a pressure loss during the diffusion operation. The diffuser tube is formed of an elastic tubular body, and slit cutting surfaces of a diffusion slit are slanted with respect to a radial direction of a membrane member in a slanted surface portion.
    Type: Grant
    Filed: April 9, 2012
    Date of Patent: December 31, 2013
    Assignee: Kubota Corporation
    Inventors: Youichirou Hirose, Yasunobu Okajima
  • Publication number: 20130299413
    Abstract: A membrane separation device is provided with membrane modules comprising multiple membrane elements, a frame body accommodating the membrane modules stacked in multiple stages, a stopper for closing an end portion of the frame body to prevent the membrane modules accommodated in the frame from being released, and elastic members which, arranged in a state of elastic deformation in the vertical direction in the frame with the end portion of the frame being closed, suppress vertical vibration of the membrane modules accommodated in the frame, whereby making it possible to avoid vibration of the membrane modules inside the frame body even if the volume of the membrane modules accommodated in the frame body varies.
    Type: Application
    Filed: July 17, 2013
    Publication date: November 14, 2013
    Inventors: Hidetoshi MASUTANI, Yasunobu OKAJIMA
  • Publication number: 20130299412
    Abstract: A membrane separation device includes a plurality of membrane elements each having a separation membrane arranged on front and back sides of a flat filter plate, wherein the membrane elements are oriented vertically and arranged in an array separated by a fixed distance such that the separation membranes are facing one another. A narrowing member is provided outside of the membrane element arranged at the outermost position along the arrangement direction, the narrowing member being disposed at least in a vicinity of a bonding portion of the filter plate and the separation membrane along the vertical direction thereof so as to be separated from the outermost membrane element by a predetermined distance smaller than the fixed distance T, thereby avoiding rupture of the separation membrane provided on outer side of the outermost membrane element even if aeration is continued in a state in which the filtering operation is stopped.
    Type: Application
    Filed: July 17, 2013
    Publication date: November 14, 2013
    Inventors: Hidetoshi MASUTANI, Yasunobu OKAJIMA