Patents by Inventor Nagakazu Kuwahara

Nagakazu Kuwahara 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).

  • Tire
    Patent number: 9186936
    Abstract: An object of the present invention is to provide a tire possessing improved wear resistance by optimizing configurations of block land portions. The tire is configured such that, in at least two adjacent block land portion arrays 5 sandwiching a circumferential groove 2, adjacent block land portions 4 constituting the block land portion arrays 5 are arranged so as to be positionally displaced from each other in the tire circumferential direction; and a distance d2 between the block land portions adjacent in the tire width direction is shorter than a distance d1 between the block land portions adjacent in the tire circumferential direction. A groove portion 8 between the block land portions adjacent in the tire width direction extends obliquely with respect to the tire width direction and the tire circumferential direction.
    Type: Grant
    Filed: August 12, 2009
    Date of Patent: November 17, 2015
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Nagakazu Kuwahara, Akiyoshi Shimizu
  • TIRE
    Publication number: 20110139324
    Abstract: An object of the present invention is to provide a tire possessing improved wear resistance by optimizing configurations of block land portions. The tire is configured such that, in at least two adjacent block land portion arrays 5 sandwiching a circumferential groove 2, adjacent block land portions 4 constituting the block land portion arrays 5 are arranged so as to be positionally displaced from each other in the tire circumferential direction; and a distance d2 between the block land portions adjacent in the tire width direction is shorter than a distance d1 between the block land portions adjacent in the tire circumferential direction. A groove portion 8 between the block land portions adjacent in the tire width direction extends obliquely with respect to the tire width direction and the tire circumferential direction.
    Type: Application
    Filed: August 12, 2009
    Publication date: June 16, 2011
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Nagakazu KUWAHARA, Akiyoshi Shimizu
  • Tread portion of an automobile tire
    Patent number: D672709
    Type: Grant
    Filed: June 9, 2011
    Date of Patent: December 18, 2012
    Assignee: Bridgestone Corporation
    Inventors: Nagakazu Kuwahara, Keiichi Kurita
  • Automobile tire
    Patent number: D675981
    Type: Grant
    Filed: November 11, 2011
    Date of Patent: February 12, 2013
    Assignee: Bridgestone Corporation
    Inventor: Nagakazu Kuwahara
  • Automobile tire
    Patent number: D726644
    Type: Grant
    Filed: June 12, 2012
    Date of Patent: April 14, 2015
    Assignee: Bridgestone Corporation
    Inventor: Nagakazu Kuwahara
  • Automobile tire
    Patent number: D728465
    Type: Grant
    Filed: June 13, 2012
    Date of Patent: May 5, 2015
    Assignee: Bridgestone Corporation
    Inventor: Nagakazu Kuwahara