Patents by Inventor Miyuki Ohyama

Miyuki Ohyama 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).

  • Rare earth borate and making method
    Patent number: 6716524
    Abstract: A rare earth borate in the form of substantially spherical, uniform diameter particles having an average particle diameter of 0.5-2 &mgr;m is prepared by mixing substantially spherical rare earth oxide co-precipitates having an average particle diameter of 0.5-2 &mgr;m with boric acid or boron oxide, and heating the mixture at 600-1100° C. for reaction. It is a useful raw material for phosphor manufacture.
    Type: Grant
    Filed: January 29, 2002
    Date of Patent: April 6, 2004
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Kazuhiro Wataya, Miyuki Ohyama
  • Rare earth oxide, basic rare earth carbonate, making method, phosphor, and ceramic
    Patent number: 6677262
    Abstract: A rare earth oxide in the form of substantially spherical particles having a Fisher diameter Df of 0.5 &mgr;m<Df<2.0 &mgr;m and a photomicrography particle diameter De of 0.5 &mgr;m<De<2.0 &mgr;m is prepared by heating and ripening an aqueous solution of water-soluble rare earth salts at 80° C. or higher while adding urea to the aqueous solution so as to keep a urea concentration of 10-50 g/liter, thereby forming a basic rare earth carbonate, and firing the basic rare earth carbonate.
    Type: Grant
    Filed: July 3, 2001
    Date of Patent: January 13, 2004
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Kazuhiro Wataya, Miyuki Ohyama
  • Rare earth borate and making method
    Publication number: 20030044609
    Abstract: A rare earth borate in the form of substantially spherical, uniform diameter particles having an average particle diameter of 0.5-2 &mgr;m is prepared by mixing substantially spherical rare earth oxide co-precipitates having an average particle diameter of 0.5-2 &mgr;m with boric acid or boron oxide, and heating the mixture at 600-1100° C. for reaction. It is a useful raw material for phosphor manufacture.
    Type: Application
    Filed: January 29, 2002
    Publication date: March 6, 2003
    Inventors: Kazuhiro Wataya, Miyuki Ohyama
  • Rare earth oxide, basic rare earth carbonate, making method, phospor, and ceramic
    Publication number: 20020017635
    Abstract: A rare earth oxide in the form of substantially spherical particles having a Fisher diameter Df of 0.5 &mgr;m<Df<2.0 &mgr;m and a photomicrography particle diameter De of 0.5 &mgr;m<De<2.0 &mgr;m is prepared by heating and ripening an aqueous solution of water-soluble rare earth salts at 80° C. or higher while adding urea to the aqueous solution so as to keep a urea concentration of 10-50 g/liter, thereby forming a basic rare earth carbonate, and firing the basic rare earth carbonate.
    Type: Application
    Filed: July 3, 2001
    Publication date: February 14, 2002
    Applicant: Shin-Etsu Chemical Co., Ltd.
    Inventors: Kazuhiro Wataya, Miyuki Ohyama