Patents by Inventor Miyuki Sumitomo

Miyuki Sumitomo 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).

  • Cathode-ray tube containing an indium borate phosphor
    Patent number: 5386176
    Abstract: An indium borate phosphor of this invention is represented by formula (In.sub.l-a-b-c-d Tb.sub.a Eu.sub.b Sm.sub.c M.sub.d)BO.sub.3 wherein[1] if b.noteq.0 and c.noteq.0,1.times.10.sup.-6 .ltoreq.a.ltoreq.1.times.10.sup.-20<b.ltoreq.1.times.10.sup.-10<c.ltoreq.1.times.10.sup.-31.times.10.sup.-7 .ltoreq.d.ltoreq.1.times.10.sup.-2[2] if b=c=0,1.times.10.sup.-6 .ltoreq.a.ltoreq.1.times.10.sup.-11.times.10.sup.-7 .ltoreq.d.ltoreq.1.times.10.sup.-2and M is at least element selected from the group consisting of Ti, P, Si, and Ge. This phosphor has a higher bonding force between BO.sub.3 ions and ions of In or any other contained metal than that of a conventional indium borate phosphor. As a result, the current-brightness and burning characteristics of the indium borate phosphor can be greatly improved.
    Type: Grant
    Filed: September 27, 1993
    Date of Patent: January 31, 1995
    Assignee: Nuchia Kagaku Kogyo K.K.
    Inventors: Miyuki Sumitomo, Katsunori Uchimura
  • Phosphor for use in a cathode-ray tube and display device using one
    Patent number: 5343316
    Abstract: A red-emitting phosphor represented by a general formula (Y.sub.1-x-y Cr.sub.x Gd.sub.y).sub.3 (Al.sub.1-z Ga.sub.z).sub.5 O.sub.12 with the provide that 0.0005.ltoreq.x.ltoreq.0.05, O.ltoreq.y.ltoreq.1, O.ltoreq.z.ltoreq.1, providing red- and infrared emitting luminescence, using alone or in a mixture with other phosphors in a cathode ray tube, having a constant main emission peak even if excited by a high current density, having a satisfactory luminescence efficiency, and causing less brightness saturation in proportion as a current density increases.
    Type: Grant
    Filed: June 29, 1993
    Date of Patent: August 30, 1994
    Assignee: Nichia Chemical Industries, Ltd.
    Inventors: Kouji Morimoto, Miyuki Sumitomo, Katsunori Uchimura
  • Cathode-ray tube phosphor
    Patent number: 5336080
    Abstract: A cathode-ray tube phosphor is manufactured by coating, on the surfaces of phosphor particles, a mixture of a metal alginate containing at least one type of a metal selected from the group consisting of Zn, Al, and an alkali earth metal and at least one type of a water-soluble binder selected from the group consisting of gum arabic, gelatin, polymethacrylamide, and polyvinyl alcohol.
    Type: Grant
    Filed: December 17, 1992
    Date of Patent: August 9, 1994
    Assignee: Nichia Chemical Industries, Ltd.
    Inventors: Miyuki Sumitomo, Ichiro Takeoka, Shoichi Bando
  • 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