Patents by Inventor Hirotsugu YOKOTANI

Hirotsugu YOKOTANI 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).

  • Ventilation fan
    Patent number: 8678785
    Abstract: A ventilation fan includes a rotor holder rotating around a rotation axis, an impeller cup including a plurality of blades provided on an outer circumference thereof, and a base portion arranged to rotatably support the rotor holder through a bearing portion. The base portion includes an outer circumferential wall extending upwards in an axial direction from an outer circumferential edge portion thereof. A gap defining a labyrinth structure is provided between an upper end portion of the outer circumferential wall of the base portion and a lower end portion of an outer circumferential portion of the impeller cup. A lower end portion of a cylindrical portion is located axially lower than the upper end portion of the outer circumferential wall of the base portion.
    Type: Grant
    Filed: July 30, 2010
    Date of Patent: March 25, 2014
    Assignee: Nidec Corporation
    Inventors: Sakae Nogami, Hirotsugu Yokotani, Kenji Iwamoto
  • VENTILATION FAN
    Publication number: 20110027075
    Abstract: A ventilation fan includes a rotor holder rotating around a rotation axis, an impeller cup including a plurality of blades provided on an outer circumference thereof, and a base portion arranged to rotatably support the rotor holder through a bearing portion. The base portion includes an outer circumferential wall extending upwards in an axial direction from an outer circumferential edge portion thereof. A gap defining a labyrinth structure is provided between an upper end portion of the outer circumferential wall of the base portion and a lower end portion of an outer circumferential portion of the impeller cup. A lower end portion of a cylindrical portion is located axially lower than the upper end portion of the outer circumferential wall of the base portion.
    Type: Application
    Filed: July 30, 2010
    Publication date: February 3, 2011
    Applicant: NIDEC CORPORATION
    Inventors: Sakae NOGAMI, Hirotsugu YOKOTANI, Kenji IWAMOTO