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US4128498A
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Chlorosilicate phosphor
Assignee: Dai Nippon Toryo Co Ltd
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Filing: 1978-03-28
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Granted: 1978-12-05
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Expires: 1998-03-28
Abstract
Abstract A divalent europium activated strontium beryllium chlorosilicate phosphor represented by the formula Sr4-x-yBexEu2+ySi3O8Cl4 WHEREIN X IS A NUMBER WITHIN THE RANGE OF 0<X</=1.5 AND Y IS A NUMBER WITHIN THE RANGE OF 0.001</=Y</=0.50.
Inventors
- 👤 Takashi Hase
- 👤 Masatake Yoshikawa
- 👤 Haruyuki Takanashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:19
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/77342
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
59 words
A divalent europium activated strontium beryllium chlorosilicate phosphor represented by the formula Sr.sub.4-x-y Be.sub.x Eu.sup.2+.sub.y Si.sub.3 O.sub.8 Cl.sub.4 wherein x is a number within the range of 0<x≦1.5 and y is a number within the range of 0.001≦y≦0.50 and exhibiting an emission peak that is at a shorter wave length than the emission peak of said phosphor without Be.
Claim 2
Dependent Claim
59 words
A divalent europium activated strontium beryllium chlorosilicate phosphor represented by the formula Sr.sub.4-x-y Be.sub.x Eu.sup.2+.sub.y Si.sub.3 O.sub.8 Cl.sub.4 wherein x is a number within the range of 0<x≦1.5 and y is a number within the range of 0.001≦y≦0.50 and exhibiting an emission peak that is at a shorter wave length than the emission peak of said phosphor without Be.
Claim 3
Dependent Claim
35 words
The divalent europium activated strontium beryllium chlorosilicate phosphor as defined in claim 1 wherein said x is a number within the range of 0<x≦1.2 and said y is a number within the range of 0.01≦y≦0.30.
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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) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |