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US4119562A Expired / Lapsed US ⏱️ 0.0 years remaining

Fluorescent compositions

Assignee: Dai Nippon Toryo Co Ltd
•
Filing: 1977-01-19
•
Granted: 1978-10-10
•
Expires: 1997-01-19
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Abstract

Abstract Fluorescent compositions which contain zinc oxide and one phosphor selected from the group hereinafter defined in a weight ratio within the range of 1/9 to 9/1, and fluorescent display devices having said fluorescent compositions in the form of a fluorescent screen, which can emit green, blue or red light under low-velocity electron excitation, said group consisting of a copper and aluminium activated zinc cadmium sulfide phosphor [(Zn 1-x , Cd x )S:Cu, Al, wherein 0≦x≦0.1], a cerium activated yttrium aluminium gallium oxide phosphor [Y 3 (Al 1-y , Ga y ) 5 O 12 :Ce, wherein 0≦y≦0.5], a manganese activated zinc silicate phosphor (Zn 2 SiO 4 :Mn), a terbium activated yttrium lanthanum oxysulfide phosphor [(Y 1-z , La z ) 2 O 2 S:Tb, wherein 0≦z≦1], a europium activated strontium gallium sulfide phosphor (SrGa 2 S 4 :Eu 2+ ), a silver activated zinc sulfide phosphor (ZnS:Ag), and a europium activated yttrium oxysulfide phosphor (Y 2 O 2 S:Eu).

Inventors

  • 👤 Akiyasu Kagami
  • 👤 Takashi Hase
  • 👤 Yoshiyuki Mimura
  • 👤 Kinichiro Narita
  • 👤 Minoru Hiraki

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 12:03
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/7729; C09K11/7731; C09K11/0805; C09K11/64; C09K11/641; C09K11/642; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/7771; C09K11/7774

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 60 words
A fluorescent composition comprising a mechanical mixture of zinc oxide and a eruopium activated yttrium oxysulfide phosphor (Y 2 O 2 S:Eu), said zinc oxide and said phosphor being present in a weight ratio from 1:9 to 9:1, the amount of europium contained in said phosphor being from 10 -2 to 1.5×10 -1 gram per one gram of yttrium oxysulfide.
Claim 2
Dependent Claim 60 words
A fluorescent composition comprising a mechanical mixture of zinc oxide and a eruopium activated yttrium oxysulfide phosphor (Y 2 O 2 S:Eu), said zinc oxide and said phosphor being present in a weight ratio from 1:9 to 9:1, the amount of europium contained in said phosphor being from 10 -2 to 1.5×10 -1 gram per one gram of yttrium oxysulfide.
Claim 3
Dependent Claim 31 words
A fluorescent composition as defined in claim 1 wherein the amount of europium contained in said phosphor is from 5×10 -2 to 6×10 -2 gram per one gram of yttrium oxysulfide.

References Cited (Backward Citations)

US2921201A Cited
US3423621A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1981-10-09 1982-04-10 1982-10-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1985-10-09 1986-04-10 1986-10-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1989-10-09 1990-04-10 1990-10-10 $7700.00 Window Closed / Lapsed

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