Patents Examined by Dong Van Nguyen
  • Vitrified super-abrasive-grain grindstone
    Patent number: 9168637
    Abstract: A vitrified superabrasive grain grinding stone includes superabrasive grains including a CBN abrasive grain as a main abrasive grain and a diamond abrasive grain as an auxiliary abrasive grain bonded together by use of a vitrified bond. The auxiliary abrasive grain has an average grain diameter equal to ½ to 1/10 of that of the main abrasive grain, and the auxiliary abrasive grain has a toughness value of 0.4 to 1 when that of the main abrasive grain is given as 1.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: October 27, 2015
    Assignee: NORITAKE CO., LIMITED
    Inventors: Akihiro Mizuno, Norio Imai, Kouichi Yoshimura, Takeshi Mishima