Patents by Inventor Hidetoshi Okamoto

Hidetoshi Okamoto 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: 20200339419
    Abstract: Glass-coated aluminum nitride particles and a method for producing the same. The glass-coated aluminum nitride particles include aluminum nitride particles and a glass phase which covers at least a part of the surface of each aluminum nitride particle. The glass phase is a composition which contains at least a glass component; and the proportion of the composition containing a glass component is 0.2 parts by weight to 5.0 parts by weight with respect to 100 parts by weight of the aluminum nitride particles. The composition containing the glass component further contains boron nitride particle; and the aluminum nitride particles have a volume cumulative d50 of from 10 ?m to 200 ?m.
    Type: Application
    Filed: December 10, 2018
    Publication date: October 29, 2020
    Applicant: SHOWA DENKO K.K.
    Inventors: Yuki OTSUKA, Hidetoshi OKAMOTO
  • Patent number: 10513749
    Abstract: A hot-rolled steel sheet has predetermined chemical composition, a sum of a Si content and an Al content is higher than 0.20% and lower than 0.81%, a microstructure includes, by area fraction, 90% to 99% of a ferrite, 1% to 10% of a martensite, and a bainite limited to 5% or less, the grain size of the martensite is 1 to 10 ?m, the X-ray random intensity ratio of a {211}<011> orientation which is parallel to a rolled surface of the steel sheet and is parallel to a rolling direction is 3.0 or less.
    Type: Grant
    Filed: May 28, 2014
    Date of Patent: December 24, 2019
    Inventors: Takeshi Toyoda, Riki Okamoto, Ryohta Niiya, Hiroshi Sakai, Hidetoshi Shindo
  • Publication number: 20030125418
    Abstract: The present invention provides particulate alumina having a mean particle size corresponding to a volume-cumulative (50%) mean particle size (D50) of 1.5 to 4 &mgr;m and a ratio (D90/D1O) of D90 to D10 of 2.5 or less. The alumina contains secondary particles having a particle size of at least 10 &mgr;m in an amount of 0.1 mass % or less; secondary particles having a particle size of 0.5 &mgr;m or less in an amount of 5 mass % or less; and an &agr;-phase as a predominant phase.fluoride. The present invention also provides a method for producing the particulate alumina.
    Type: Application
    Filed: October 10, 2002
    Publication date: July 3, 2003
    Applicant: SHOW A DENKO K.K.
    Inventors: Susumu Shibusawa, Hidetoshi Okamoto, Hiroshi Takahashi, Nobuo Uotani, Koichiro Take