Patents by Inventor Mami Tokunaga

Mami Tokunaga 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).

  • Sol of spinous inorganic oxide particles, method of producing the sol, and polishing agent containing the sol
    Patent number: 8187351
    Abstract: The present invention provides a sol of spinous inorganic oxide particles not containing coarse particles, in which particles having extremely homogeneous particles are dispersed in a solvent. An acidic silicic acid is added to a dispersion liquid of core particles to grow core particles, and then again the acidic silicic acid is added at the addition rate 1.2 to 1.8 higher than that in the previous step to prepare a sol of spinous inorganic oxide particles. Then the sol is subjected to centrifugation to remove coarse particles having the diameter of 800 nm or more, thus spinous inorganic oxide particles having peculiar form such as a spinous one being obtained.
    Type: Grant
    Filed: November 29, 2007
    Date of Patent: May 29, 2012
    Assignee: JGC Catalysts and Chemicals Ltd.
    Inventors: Kazuhiro Nakayama, Mami Tokunaga, Akira Nakashima, Kazuaki Inoue, Osamu Yoshida, Yoshinori Wakamiya, Hiroyasu Nishida
  • Sol of spinous inorganic oxide particles, method of producing the sol, and polishing agent containing the sol
    Publication number: 20080131571
    Abstract: The present invention provides a sol of spinous inorganic oxide particles not containing coarse particles, in which particles having extremely homogeneous particles are dispersed in a solvent. An acidic silicic acid is added to a dispersion liquid of core particles to grow core particles, and then again the acidic silicic acid is added at the addition rate 1.2 to 1.8 higher than that in the previous step to prepare a sol of spinous inorganic oxide particles. Then the sol is subjected to centrifugation to remove coarse particles having the diameter of 800 nm or more, thus spinous inorganic oxide particles having peculiar form such as a spinous one being obtained.
    Type: Application
    Filed: November 29, 2007
    Publication date: June 5, 2008
    Applicant: CATALYSTS& CHEMICALS INDUSTRIES CO., LTD
    Inventors: Kazuhiro Nakayama, Mami Tokunaga, Akira Nakashima, Kazuaki Inoue, Osamu Yoshida, Yoshinori Wakamiya, Hiroyasu Nishida