US4003845A
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Luminescent material
Assignee: US Philips Corp
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Filing: 1976-04-09
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Granted: 1977-01-18
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Expires: 1996-04-09
Abstract
Abstract Luminescent cerium- and manganese-activated aluminate which is defined by the formula La 1 -x -p Ba x Ce p Al y -q Mn q O 1 .5y +1 .5 -0 .5x - 0.5q Where 10 ≦ y ≦ 13 0.10 ≦ x ≦ 0.75 0.05 ≦ p ≦ 0.75 x+ p ≦ 0.90 0.10 ≦ q ≦ 0.50
Inventors
- 👤 Petrus Franciscus Josef VAN DEN Boom
- 👤 Albert Leendert Nicolaas Stevels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:04
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7774
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
A luminescent material consisting essentially of a luminescent cerium- and manganese-activated aluminate having a composition defined by the formula La 1 -x -p Ba x Ce p Al y -q Mn q O 1 .5y +1 .5 -0 .5x -0 .5q where 10 ≦ y ≦ 13 0.10 ≦ x ≦ 0.75 0.05 ≦ p ≦ 0.75 (x+p ≦ 0.90 0.10 ≦ q ≦ 0.50.
Claim 2
Dependent Claim
65 words
A luminescent material consisting essentially of a luminescent cerium- and manganese-activated aluminate having a composition defined by the formula La 1 -x -p Ba x Ce p Al y -q Mn q O 1 .5y +1 .5 -0 .5x -0 .5q where 10 ≦ y ≦ 13 0.10 ≦ x ≦ 0.75 0.05 ≦ p ≦ 0.75 (x+p ≦ 0.90 0.10 ≦ q ≦ 0.50.
Claim 3
Dependent Claim
14 words
A luminescent material as claimed in claim 1, wherein 11 ≦ y ≦ 12.
Claim 4
Dependent Claim
24 words
A luminescent material as claimed in claim 2, wherein 0.20 ≦ x ≦ 0.50 0.20 ≦ p ≦ 0.50 0.20 ≦ q ≦ 0.40.
Claim 5
Dependent Claim
22 words
A luminescent material as claimed in claim 1, wherein up to 75 mole% of the Ba is replaced by Sr and/or Ca.
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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |