US4057507A
Expired / Lapsed
US
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Europium and samarium activated rare earth oxysulfide phosphor
Assignee: Hitachi Ltd
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Filing: 1975-12-18
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Granted: 1977-11-08
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Expires: 1995-12-18
Abstract
Abstract Rare earth oxysulfide phosphors consisting essentially of a compound of a general formula, {(Yu+i, Gd1-u)1-x-y-zEuxSmy(Tb1-p, Prp)z}2 . O2S, wherein 0 </= z </= 1 x 10-4, 0 </= p </= 1, 0 </= u </= 1, and x and y satisfy the area B, defined by a, b, c and d of FIG. 5.
Inventors
- 👤 Hajime Yamamoto
- 👤 Tsuyoshi Kano
- 👤 Masaki Nakano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:20
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7784; C09K11/7787; C09K11/7789
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
59 words
A rare earth oxysulfide phosphor consisting essentially of a compound of the general formula, {Y.sub.u, Gd.sub.1-u).sub.1-x-y-z Eu.sub.x Sm.sub.y (Tb.sub.1-p, Pr.sub.p).sub.z }.sub.2.sup.. O.sub.2 S, wherein 0 ≦ z ≦ 1×10 -4 , 0 ≦ p ≦ 1, 0 ≦ u ≦ 1, and x and y satisfy the area B of FIG. 5 defined by a, b, c and d.
Claim 2
Dependent Claim
59 words
A rare earth oxysulfide phosphor consisting essentially of a compound of the general formula, {Y.sub.u, Gd.sub.1-u).sub.1-x-y-z Eu.sub.x Sm.sub.y (Tb.sub.1-p, Pr.sub.p).sub.z }.sub.2.sup.. O.sub.2 S, wherein 0 ≦ z ≦ 1×10 -4 , 0 ≦ p ≦ 1, 0 ≦ u ≦ 1, and x and y satisfy the area B of FIG. 5 defined by a, b, c and d.
Claim 3
Dependent Claim
33 words
A rare earth oxysulfide phosphor as defined in claim 1, wherein x and y in said general formula fall in the area A defined by a, b, e, and f of FIG. 5.
Claim 4
Dependent Claim
18 words
A rare earth oxysulfide phosphor as defined in claim 2, wherein u in said general formula is 1.
Claim 5
Dependent Claim
18 words
A rare earth oxysulfide phosphor as defined in claim 2, wherein p in said general formula is 0.
Claim 6
Dependent Claim
18 words
A rare earth oxysulfide phosphor as defined in claim 1, wherein u in said general formula is 1.
Claim 7
Dependent Claim
18 words
A rare earth oxysulfide phosphor as defined in claim 1, wherein p in said general formula are 0.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |