Patents by Inventor Norihiko Yagi

Norihiko Yagi 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).

  • Glass frit useful for the preparation of glass bubbles, and glass bubbles prepared by using it
    Patent number: 5064784
    Abstract: A glass frit useful as starting material for the preparation of glass bubbles having an extremely low alkali elution, which has the following composition represented by weight percent.______________________________________ SiO.sub.2 58-75 B.sub.2 O.sub.3 11-25 Na.sub.2 O 3-12.5 ZnO 0-3 K.sub.2 O 0-3 Al.sub.2 O.sub.3 0-3 Li.sub.2 O 0-3 P.sub.2 O.sub.5 0-3 Total alkali metal oxides Sb.sub.2 O.sub.3 0-1 3-15 As.sub.2 O.sub.3 0-1 CaO 5-15 SO.sub.3 0.05-1 MgO 0-3 B.sub.2 O.sub.3 /Na.sub.2 O 1.7-4.
    Type: Grant
    Filed: April 18, 1990
    Date of Patent: November 12, 1991
    Assignee: Tokai Kogyo Co., Ltd.
    Inventors: Osamu Saito, Norihiko Yagi, Yoshinori Ito