Patents by Inventor Aki Ishikawa

Aki Ishikawa 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).

  • Multistage pump
    Patent number: 7648337
    Abstract: A multistage pump according to the present invention has a plurality of intermediate casings (2) formed by press-forming a steel plate. The intermediate casing has a cylindrical side portion (21), a stage flat portion (23) with which an axial end face of an adjacent intermediate casing is held in contact, a stage side portion (24) extending axially from the stage flat portion, and a bottom portion (25) extending radially inward from the stage side portion. A relief plate (30) having an outer circumferential end face which is held in contact with an inner surface of a cylindrical side portion of the adjacent intermediate casing is attached to the bottom portion of the intermediate casing. The relief plate, the stage side portion, the stage flat portion, and the inner surface of the cylindrical side portion of the adjacent intermediate casing form a space in which an O-ring (40) is fitted.
    Type: Grant
    Filed: January 21, 2003
    Date of Patent: January 19, 2010
    Assignee: Ebara Corporation
    Inventors: Sou Kuroiwa, Kenichi Kajiwara, Shoji Ito, Kikuichi Mori, Aki Ishikawa, Tetsutaro Fujiwara
  • Multistage pump
    Publication number: 20050147505
    Abstract: A multistage pump according to the present invention has a plurality of intermediate casings (2) formed by press-forming a steel plate. The intermediate casing has a cylindrical side portion (21), a stage flat portion (23) with which an axial end face of an adjacent intermediate casing is held in contact, a stage side portion (24) extending axially from the stage flat portion, and a bottom portion (25) extending radially inward from the stage side portion. A relief plate (30) having an outer circumferential end face which is held in contact with an inner surface of a cylindrical side portion of the adjacent intermediate casing is attached to the bottom portion of the intermediate casing. The relief plate, the stage side portion, the stage flat portion, and the inner surface of the cylindrical side portion of the adjacent intermediate casing form a space in which an O-ring (40) is fitted.
    Type: Application
    Filed: January 21, 2003
    Publication date: July 7, 2005
    Inventors: Sou Kuroiwa, Kenichi Kajiwara, Shoji Ito, Kikuichi Mori, Aki Ishikawa, Tetsutaro Fujiwara