Patents by Inventor Kouichi Kunikata

Kouichi Kunikata 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 phosphor
    Patent number: 5312560
    Abstract: Phosphors capable of emitting substantially white luminescent were represented by the following general formulae, (I), (II) and (III).(Y.sub.1-X-Y-Z Lu.sub.X Tb.sub.Y Sm.sub.Z).sub.2 O.sub.2 S (I)0<X.ltoreq.5.times.10.sup.-21.times.10.sup.-3 .ltoreq.Y.ltoreq.t.times.10.sup.-30.ltoreq.Z.ltoreq.5.times.10.sup.-2(Y.sub.1-a-b-c Yb.sub.a Tb.sub.b Sm.sub.c).sub.2 O.sub.2 S (II)wherein:0<a.ltoreq.5.times.10.sup.-41.times.10.sup.-3 .ltoreq.b.ltoreq.5.times.10.sup.-30.ltoreq.c.ltoreq.5.times.10.sup.-2(Y.sub.1-d-e-f Ce.sub.d Tb.sub.e Sm.sub.f).sub.2 O.sub.2 S (III)wherein 0<d.ltoreq.1.times.10.sup.-4 .times.10.sup.-3 .ltoreq.e.ltoreq.5.times.10.sup.-30.ltoreq.f.ltoreq.5.times.10.sup.
    Type: Grant
    Filed: March 18, 1993
    Date of Patent: May 17, 1994
    Assignee: Nichia Chemical Industries, Ltd.
    Inventors: Toshifumi Somatomo, Masaki Mori, Miyuki Sumitomo, Kouichi Kunikata, Katsunori Uchimura