US4443380A
Expired / Lapsed
US
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Organic europlum salt phosphor
Assignee: Asahi Kasei Corp
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Filing: 1980-08-22
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Granted: 1984-04-17
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Expires: 2000-08-22
Abstract
Abstract Rare-earth metal salts of organic carboxylic acids of this invention constitute themselves phosphors which exhibit unusually high luminescence efficiency, excel in chemical and physical stability and weatherability, show high affinity for other chemical substances and promise extensive usefulness in the field of high-performance luminescent products.
Inventors
- 👤 Katsuhiko Yamazoe
- 👤 Akira Yoshino
- 👤 Yoshiharu Kitahama
- 👤 Isamu Iwami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:58
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
An organic rare-earth salt phosphor comprising a crystalline rare-earth metal salt of an organic acid represented by the general formula: [A(COO).sub.l ].sub.m Z wherein: [A(COO) l ] denotes a carboxylic acid radical derived from an organic carboxylic acid [A(COOH) l ] selected from the group consisting of cinnamic acid, 3-5-dimethoxycinnamic acid and beta-(pyridyl) acrylic acid, Z is europium, l denotes 1 or 2, and m=3/l.
Claim 2
Dependent Claim
65 words
An organic rare-earth salt phosphor comprising a crystalline rare-earth metal salt of an organic acid represented by the general formula: [A(COO).sub.l ].sub.m Z wherein: [A(COO) l ] denotes a carboxylic acid radical derived from an organic carboxylic acid [A(COOH) l ] selected from the group consisting of cinnamic acid, 3-5-dimethoxycinnamic acid and beta-(pyridyl) acrylic acid, Z is europium, l denotes 1 or 2, and m=3/l.
Claim 3
Dependent Claim
17 words
The organic rare-earth salt phosphor according to claim 1, wherein the organic carboxylic acid is cinnamic acid.
Claim 4
Dependent Claim
17 words
The organic rare-earth salt phosphor according to claim 1, wherein the organic carboxylic acid is 3,5-dimethoxycinnamic acid.
Claim 5
Dependent Claim
17 words
The organic rare-earth salt phosphor according to claim 1, wherein the organic carboxylic acid is beta(3-pyridyl)acrylic acid.
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) | 1987-04-17 | 1987-10-17 | 1988-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-17 | 1991-10-17 | 1992-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-17 | 1995-10-17 | 1996-04-17 | $7700.00 | Window Closed / Lapsed |