US4174294A
Expired / Lapsed
US
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Fluorescent material
Assignee: Mitsubishi Electric Corp
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Filing: 1978-10-25
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Granted: 1979-11-13
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Expires: 1998-10-25
Abstract
Abstract A fluorescent material is an alkaline earth metal boron phosphate activated by a divalent europium compound having the formula m(Sr 1-x-y-p Ba x Ca y Eu p O)·(1-n)P 2 O 5 nB 2 O 3 wherein parameters x, y, p, m and n are respectively in the ranges: 0≦x≦0.5 0≦y≦0.2 0.001≦p≦0.15 1.75≦m≦2.30 0.05≦n≦0.23
Inventors
- 👤 Katsuo Murakami
- 👤 Mitsuoki Otani
- 👤 Hiroshi Ito
- 👤 Kenzo Awazu
- 👤 Sumiaki Ibuki
- 👤 Toshiyuki Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:06
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/7737; C09K11/7738; C09K11/774
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
47 words
An alkaline earth metal boron phosphate fluorescent material activated by divalent europium having the formula m(Sr 1-x-y-p Ba x Ca y Eu p O)·(1-n)P 2 O 5 ·nB 2 O 3 wherein parameters x,y,p,m, and n are respectively in the ranges: 0≦x≦0.5 0≦y≦0.2 0.001≦p≦0.15 1.75≦m≦2.30 and 0.05≦n≦0.23.
Claim 2
Dependent Claim
47 words
An alkaline earth metal boron phosphate fluorescent material activated by divalent europium having the formula m(Sr 1-x-y-p Ba x Ca y Eu p O)·(1-n)P 2 O 5 ·nB 2 O 3 wherein parameters x,y,p,m, and n are respectively in the ranges: 0≦x≦0.5 0≦y≦0.2 0.001≦p≦0.15 1.75≦m≦2.30 and 0.05≦n≦0.23.
Claim 3
Dependent Claim
20 words
A fluroescent material according to claim 1 wherein the parameters m and n are in the ranges: 1.9≦m≦2.1 and 0.14≦n≦0.18.
Claim 4
Dependent Claim
16 words
A fluorescent material according to claim 1 wherein the parameter p is in the range: 0.005≦p≦0.05.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |