Patents by Inventor Masaharu Aizawa

Masaharu Aizawa 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: 9114407
    Abstract: A rotor includes a plurality of holding cavities for holding specimen containers, respectively. A transverse cross sectional shape of the holding cavity is a substantially triangular shape having one vertex on an inner circumference side of the rotor. Two vertices of the substantially triangular shape are arranged on an outer circumference side of the rotor so as to have equidistance from a rotary shaft of the rotor. Spacing between sides of the substantially triangular shape in a circumferential direction of the rotor gradually increase over 60% or more a radial length of the holding cavity from an innermost circumferential position to the outer circumference side of the rotor when viewed in its transverse plane.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: August 25, 2015
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Yoshimitsu Kitazawa, Masaharu Aizawa, Kenichi Nemoto, Jun Sato
  • Patent number: 8475351
    Abstract: The present invention provides a zonal centrifuge which has superior workability and functionality when a sample is filled and extracted. An oil bearing fitted to an outer circumference of a lower tube of a rotor is arranged on an internal face of a bearing housing fixed over a door adapter of the centrifuge. As the oil bearing and the lower tube are lubricated, a vacuum environment in a rotor rotating chamber is maintained. A rotating seal located at an upper leading end of the lower tube of the rotor and a fixing seal facing the rotating seal are arranged and provided in a sealed space formed by a mechanical seal member and the bearing housing, and the fixing seal is so manipulated as to be able to freely join and separate from the rotating seal.
    Type: Grant
    Filed: September 21, 2009
    Date of Patent: July 2, 2013
    Assignee: Hitachi Koki Co., Ltd.
    Inventor: Masaharu Aizawa
  • Publication number: 20110319247
    Abstract: A centrifuge sample container includes: a body portion configured to contain a sample; and a cap portion configured to be engaged with and attached on the body portion. The body portion has a substantially triangular external shape defining three apex portions and three side portions between two of the apex portions when viewed from above and has a circular opening portion in an upper portion of the body portion. Distances between centers of the apex portions are equal to one another. Each of the apex portions is formed with a first radius of curvature when viewed from above. Each of the side portions is formed into a outwardly curved arc-like shape with a second radius of curvature when viewed from above.
    Type: Application
    Filed: June 24, 2011
    Publication date: December 29, 2011
    Applicant: HITACHI KOKI CO., LTD.
    Inventors: Yoshimitsu KITAZAWA, Masaharu AIZAWA, Kenichi NEMOTO
  • Patent number: 7909751
    Abstract: A centrifugal separator includes a sample line and a rotating apparatus portion including a rotor that has a rotor chamber. The centrifugal separator centrifugally separates a sample by supplying the sample from the sample line into the rotor and driving to rotate the rotor in the rotor chamber and discharges the centrifugally separated sample from the rotor via the sample line. The centrifugal separator includes a sterilizing apparatus for sterilizing at least a portion with which the sample is brought into contact by making a sterilizing fluid flow through the sample line.
    Type: Grant
    Filed: October 8, 2010
    Date of Patent: March 22, 2011
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Yoshinori Tobita, Masaharu Aizawa, Katsunori Akatsu, Tomohiro Koizumi
  • Patent number: 7901342
    Abstract: A centrifugal separator includes a sample line and a rotating apparatus portion including a rotor that has a rotor chamber. The centrifugal separator centrifugally separates a sample by supplying the sample from the sample line into the rotor and driving to rotate the rotor in the rotor chamber and discharges the centrifugally separated sample from the rotor via the sample line. The centrifugal separator includes a sterilizing apparatus for sterilizing at least a portion with which the sample is brought into contact by making a sterilizing fluid flow through the sample line.
    Type: Grant
    Filed: June 3, 2009
    Date of Patent: March 8, 2011
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Yoshinori Tobita, Masaharu Aizawa, Katsunori Akatsu, Tomohiro Koizumi
  • Publication number: 20110028297
    Abstract: A centrifugal separator includes a sample line and a rotating apparatus portion including a rotor that has a rotor chamber. The centrifugal separator centrifugally separates a sample by supplying the sample from the sample line into the rotor and driving to rotate the rotor in the rotor chamber and discharges the centrifugally separated sample from the rotor via the sample line. The centrifugal separator includes a sterilizing apparatus for sterilizing at least a portion with which the sample is brought into contact by making a sterilizing fluid flow through the sample line.
    Type: Application
    Filed: October 8, 2010
    Publication date: February 3, 2011
    Applicant: HITACHI KOKI CO., LTD.
    Inventors: Yoshinori Tobita, Masaharu Aizawa, Katsunori Akatsu, Tomohiro Koizumi
  • Patent number: 7874973
    Abstract: According to an aspect of the present invention, there is provided a centrifuge in which a steam sterilization of a sample flow passage is performed, the centrifuge including: a rotor configured to centrifuging a liquid sample; a drive portion that drives and rotates the rotor; a chamber that accommodates the rotor therein, the chamber having a first and a second penetration holes provided on an upper and a bottom portions thereof, respectively; and a first and a second valves disposed on the first and the second penetration holes, respectively; wherein a cooling gas is introduced through one of the first and the second penetration holes and discharged through the other to cool a periphery of the rotor before or after execution of a centrifuging operation of the liquid sample.
    Type: Grant
    Filed: May 30, 2008
    Date of Patent: January 25, 2011
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Katsunori Akatsu, Masaharu Aizawa, Tatsuya Konno
  • Publication number: 20100331163
    Abstract: A rotor includes a plurality of holding cavities for holding specimen containers, respectively. A transverse cross sectional shape of the holding cavity is a substantially triangular shape having one vertex on an inner circumference side of the rotor. Two vertices of the substantially triangular shape are arranged on an outer circumference side of the rotor so as to have equidistance from a rotary shaft of the rotor. Spacing between sides of the substantially triangular shape in a circumferential direction of the rotor gradually increase over 60% or more a radial length of the holding cavity from an innermost circumferential position to the outer circumference side of the rotor when viewed in its transverse plane.
    Type: Application
    Filed: June 30, 2010
    Publication date: December 30, 2010
    Applicant: HITACHI KOKI CO. LTD.
    Inventors: Yoshimitsu KITAZAWA, Masaharu AIZAWA, Kenichi NEMOTO, Jun SATO
  • Patent number: 7794383
    Abstract: A centrifugal separator includes a rotator part that separates a liquid sample and has a rotor and a drive part. The rotor receives a liquid sample therein and rotates to separate the liquid sample. The drive part drives the rotor to rotate. A controller part controls operations of the rotator part which is mounted in a rotator casing. A controller casing which is separate from the rotator casing mounts the controller part, and the controller part is connected via a drive wire to the drive part in the rotator part. The rotor casing is disposed at a clean room, the controller casing is disposed outside the clean room, and the drive wire passes through a wall of the clean room via an air-tight sealing mechanism.
    Type: Grant
    Filed: June 18, 2008
    Date of Patent: September 14, 2010
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Kenichi Tetsu, Masaharu Aizawa, Katsunori Akatsu, Yoshinori Tobita, Yukiyoshi Maehara
  • Publication number: 20100081553
    Abstract: The present invention provides a zonal centrifuge which has superior workability and functionality when a sample is filled and extracted. An oil bearing fitted to an outer circumference of a lower tube of a rotor is arranged on an internal face of a bearing housing fixed over a door adapter of the centrifuge. As the oil bearing and the lower tube are lubricated, a vacuum environment in a rotor rotating chamber is maintained. A rotating seal located at an upper leading end of the lower tube of the rotor and a fixing seal facing the rotating seal are arranged and provided in a sealed space formed by a mechanical seal member and the bearing housing, and the fixing seal is so manipulated as to be able to freely join and separate from the rotating seal.
    Type: Application
    Filed: September 21, 2009
    Publication date: April 1, 2010
    Inventor: Masaharu AIZAWA
  • Publication number: 20090239729
    Abstract: A centrifugal separator includes a sample line and a rotating apparatus portion including a rotor that has a rotor chamber. The centrifugal separator centrifugally separates a sample by supplying the sample from the sample line into the rotor and driving to rotate the rotor in the rotor chamber and discharges the centrifugally separated sample from the rotor via the sample line. The centrifugal separator includes a sterilizing apparatus for sterilizing at least a portion with which the sample is brought into contact by making a sterilizing fluid flow through the sample line.
    Type: Application
    Filed: June 3, 2009
    Publication date: September 24, 2009
    Inventors: Yoshinori TOBITA, Masaharu Aizawa, Katsunori Akatsu, Tomohiro Koizumi
  • Patent number: 7591775
    Abstract: A centrifugal separator includes: a sample line; and a rotating apparatus portion including a rotor that has a rotor chamber. The centrifugal separator centrifugally separates a sample by supplying the sample from the sample line into the rotor and driving to rotate the rotor in the rotor chamber and discharges the centrifugally separated sample from the rotor via the sample line. The centrifugal separator includes: a sterilizing apparatus for sterilizing at least a portion with which the sample is brought into contact by making a sterilizing fluid flow through the sample line.
    Type: Grant
    Filed: July 7, 2005
    Date of Patent: September 22, 2009
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Yoshinori Tobita, Masaharu Aizawa, Katsunori Akatsu, Tomohiro Koizumi
  • Publication number: 20080300124
    Abstract: According to an aspect of the present invention, there is provided a centrifuge in which a steam sterilization of a sample flow passage is performed, the centrifuge including: a rotor configured to centrifuging a liquid sample; a drive portion that drives and rotates the rotor; a chamber that accommodates the rotor therein, the chamber having a first and a second penetration holes provided on an upper and a bottom portions thereof, respectively; and a first and a second valves disposed on the first and the second penetration holes, respectively; wherein a cooling gas is introduced through one of the first and the second penetration holes and discharged through the other to cool a periphery of the rotor before or after execution of a centrifuging operation of the liquid sample.
    Type: Application
    Filed: May 30, 2008
    Publication date: December 4, 2008
    Inventors: Katsunori AKATSU, Masaharu Aizawa, Tatsuya Konno
  • Publication number: 20080251436
    Abstract: A centrifugal separator includes a rotator part that separates a liquid sample and has a rotor and a drive part. The rotor receives a liquid sample therein and rotates to separate the liquid sample. The drive part drives the rotor to rotate. A controller part controls operations of the rotator part which is mounted in a rotator casing. A controller casing which is separate from the rotator casing mounts the controller part, and the controller part is connected via a drive wire to the drive part in the rotator part. The rotor casing is disposed at a clean room, the controller casing is disposed outside the clean room, and the drive wire passes through a wall of the clean room via an air-tight sealing mechanism.
    Type: Application
    Filed: June 18, 2008
    Publication date: October 16, 2008
    Inventors: Kenichi Tetsu, Masaharu Aizawa, Katsunori Akatsu, Yoshinori Tobita, Yukiyoshi Maehara
  • Patent number: 7396324
    Abstract: A centrifugal separator includes a rotator part, a controller part, and a first control panel. The rotator part has a rotor for separating components in a liquid sample, and a drive shaft for driving the rotor to rotate. The controller part controls operations of the rotator part. The first control panel is provided with a first operating part for setting operating conditions of the rotator part including the desired rotating speed of the rotor and the desired operation period of time of the rotor, and a first display unit for displaying the operating conditions and status of the rotator part. A second control panel having the same functions as the first control panel is provided in a location separate from the controller part. Hence, a user can check the operating status of the centrifugal separator and set and modify operating conditions for the centrifugal separator not only by using the first control panel but also by using the second control panel.
    Type: Grant
    Filed: October 18, 2004
    Date of Patent: July 8, 2008
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Kenichi Tetsu, Masaharu Aizawa, Katsunori Akatsu, Yoshinori Tobita, Yukiyoshi Maehara
  • Patent number: 7214177
    Abstract: A culture/centrifugal tube includes a tube and a cap. The cap has a disk portion and an annular portion that define an annular groove therebetween. The annular groove opens at a position level with the surface of the disk portion. The open end of the tube extends into the annular groove, with the open end of the vessel in abutment against the surface of the disk portion when the cap is fully engaged on the tube. An angle rotor that is used in a centrifuge is formed with an accommodation hole that receives the culture/centrifugal tube. The accommodation hole including a smaller-diameter tube accommodating portion that accommodates the tube and a larger-diameter cap accommodating portion that accommodates the cap. The cap accommodating portion includes a region that entirely encompasses a corresponding portion of the outer periphery of the annular portion of the cap.
    Type: Grant
    Filed: April 25, 2003
    Date of Patent: May 8, 2007
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Masaharu Aizawa, Masataka Morita
  • Patent number: 7144361
    Abstract: A continuous flow type centrifuge to which a liquid sample is continuous supplied. The centrifuge includes a rotor rotatably supported by a main housing and drivingly rotated by a motor. The rotor includes a cylindrical rotor body, a hollow cylindrical core body, and end plates. The hollow cylindrical core body is disposed in the rotor body providing a space therebetween. The core body has an upper open end, a lower open end and an outer peripheral surface provided with a plurality of partitioning walls positioned at an equal interval in a circumferential direction of the core body for providing a plurality of cavities each defined by the core body, the rotor body and neighboring partitioning walls. The end plates include an upper end plate disposed to cover the upper open end, and a lower end plate disposed to cover the lower open end.
    Type: Grant
    Filed: April 28, 2004
    Date of Patent: December 5, 2006
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Masaharu Aizawa, Yoshinori Tobita
  • Publication number: 20060009341
    Abstract: A centrifugal separator includes: a sample line; and a rotating apparatus portion including a rotor that has a rotor chamber. The centrifugal separator centrifugally separates a sample by supplying the sample from the sample line into the rotor and driving to rotate the rotor in the rotor chamber and discharges the centrifugally separated sample from the rotor via the sample line. The centrifugal separator includes: a sterilizing apparatus for sterilizing at least a portion with which the sample is brought into contact by making a sterilizing fluid flow through the sample line.
    Type: Application
    Filed: July 7, 2005
    Publication date: January 12, 2006
    Inventors: Yoshinori Tobita, Masaharu Aizawa, Katsunori Akatsu, Tomohiro Koizumi
  • Patent number: 6916282
    Abstract: A bucket consists of a sample container holding member and a metallic member. The sample container holding member is made of a composite material consisting of a reinforcing fiber and a resin. The metallic member has portions engaged with a rotor body.
    Type: Grant
    Filed: July 18, 2002
    Date of Patent: July 12, 2005
    Assignee: Hitachi Koki Co., Ltd.
    Inventor: Masaharu Aizawa
  • Patent number: D653554
    Type: Grant
    Filed: November 25, 2009
    Date of Patent: February 7, 2012
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Yoshimitsu Kitazawa, Masaharu Aizawa, Kenichi Nemoto, Jun Sato