Patents by Inventor Takeshi Iwatani

Takeshi Iwatani 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: 20240166000
    Abstract: The tire maximum width in the reference condition is the center value or more and the upper limit or less of the tire maximum width specified in the standard, and the tire maximum width position in the reference condition is located at the position, with a distance of more than 50% of the tire cross-sectional height, outward in the tire radial direction from the bead baseline.
    Type: Application
    Filed: November 5, 2021
    Publication date: May 23, 2024
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Tomotaka SAKIYAMA, Takeshi IWATANI
  • Patent number: 10343463
    Abstract: A pneumatic tire, having in a ground contact surface of a tread a plurality of main grooves extending in the tread circumferential direction and a plurality of land portions demarcated by the main grooves and tread ends, wherein, provided that two land portions adjacent to the central land portion on the respective sides in the tread width direction of the central land portion each represent an adjacent land portion, rigidity in the tread circumferential direction of the central land portion is lower than rigidity in the tread circumferential direction of the adjacent land portion.
    Type: Grant
    Filed: June 16, 2014
    Date of Patent: July 9, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Takeshi Iwatani, Kento Hashimoto
  • Patent number: 9446629
    Abstract: A pneumatic tire is disclosed, adapted to highly effectively combine on-ice and on-snow performances. The pneumatic tire includes block groups (G) formed by polygonal blocks (10), which are arranged closely in a tread portion (1). The polygonal blocks (10) are formed by grooves (9) including first groove (9a) with a groove width (W9a) between the polygonal blocks 10 neighboring with each other in the tire circumferential direction. The groove width (W9a) of the first grooves (9a) is larger than a groove width (W9b) of second grooves (9b) between the polygonal blocks 10 neighboring with each other with a zigzag pattern.
    Type: Grant
    Filed: February 28, 2011
    Date of Patent: September 20, 2016
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Kento Hashimoto, Takeshi Iwatani, Tooru Hayashi
  • Publication number: 20160144667
    Abstract: A pneumatic tire, having in a ground contact surface of a tread a plurality of main grooves extending in the tread circumferential direction and a plurality of land portions demarcated by the main grooves and tread ends, wherein, provided that two land portions adjacent to the central land portion on the respective sides in the tread width direction of the central land portion each represent an adjacent land portion, rigidity in the tread circumferential direction of the central land portion is lower than rigidity in the tread circumferential direction of the adjacent land portion.
    Type: Application
    Filed: June 16, 2014
    Publication date: May 26, 2016
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Takeshi IWATANI, Kento HASHIMOTO
  • Patent number: 8985168
    Abstract: A pneumatic tire according to the present invention includes a tread section provided with circumferential grooves extending in a tire circumferential direction, lateral grooves extending in a tread width direction, and a plurality of land blocks defined by the circumferential grooves and the lateral grooves, each of the land blocks provided with sipes formed to extend to a predetermined depth from a tread surface inward in a tire radial direction, each of the sipes having an end portion communicating with at least any one of the circumferential grooves and the lateral grooves. At least one of the plurality of sipes includes an expanded diameter section on an inner end in the tire radial direction, and the expanded diameter section is formed to increase in diameter extending toward each of sidewalls of the land block.
    Type: Grant
    Filed: October 19, 2010
    Date of Patent: March 24, 2015
    Assignee: Bridgestone Corporation
    Inventors: Makoto Kurokawa, Takeshi Iwatani
  • Publication number: 20130061991
    Abstract: A pneumatic tire is disclosed, adapted to highly effectively combine on-ice and on-snow performances. The pneumatic tire includes block groups (G) formed by polygonal blocks (10), which are arranged closely in a tread portion (1). The polygonal blocks (10) are formed by grooves (9) including first groove (9a) with a groove width (W9a) between the polygonal blocks 10 neighboring with each other in the tire circumferential direction. The groove width (W9a) of the first grooves (9a) is larger than a groove width (W9b) of second grooves (9b) between the polygonal blocks 10 neighboring with each other with a zigzag pattern.
    Type: Application
    Filed: February 28, 2011
    Publication date: March 14, 2013
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Kento Hashimoto, Takeshi Iwatani, Tooru Hayashi
  • Publication number: 20120234443
    Abstract: A pneumatic tire according to the present invention includes a tread section provided with circumferential grooves extending in a tire circumferential direction, lateral grooves extending in a tread width direction, and a plurality of land blocks defined by the circumferential grooves and the lateral grooves, each of the land blocks provided with sipes formed to extend to a predetermined depth from a tread surface inward in a tire radial direction, each of the sipes having an end portion communicating with at least any one of the circumferential grooves and the lateral grooves. At least one of the plurality of sipes includes an expanded diameter section on an inner end in the tire radial direction, and the expanded diameter section is formed to increase in diameter extending toward each of sidewalls of the land block.
    Type: Application
    Filed: October 19, 2010
    Publication date: September 20, 2012
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Makoto Kurokawa, Takeshi Iwatani
  • Patent number: D677615
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: March 12, 2013
    Assignee: Bridgestone Corporation
    Inventors: Kento Hashimoto, Takeshi Iwatani