US3965031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Red emitting phosphors
Assignee: Osram Sylvania Inc
•
Filing: 1975-05-19
•
Granted: 1976-06-22
•
Expires: 1995-05-19
Abstract
Abstract This application relates to red emitting phosphors of the formula Li 1 -x Ca 2x Al 5 -x O 8 :Fe + 3 or LiCa x Al 5 -2x Si x O 8 :Fe + 3 wherein 0.005≦x≦0.25. These phosphors may be used in fluorescent lamps or in cathodoluminescent screens for cathode-ray tubes where red emission is desired.
Inventors
- 👤 Richard M. Klein
- 👤 Natansohn Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:45
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/64; C09K11/646
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
74 words
A phosphor represented by the formula Li 1 -x Ca 2x Al 5 -x O 8 : Fe.sup. +3 or LiCa x Al 5 -2x Si x O 8 : Fe.sup. +3 wherein 0.005≦x≦0.25 and the iron (Fe.sup. +3 ) activator is present in about 0.001 to 0.013 moles/formula weight of said Li 1 -x Ca 2x Al 5 -x O 8 or said LiCa x Al 5 -2x Si x O 8 .
Claim 2
Dependent Claim
74 words
A phosphor represented by the formula Li 1 -x Ca 2x Al 5 -x O 8 : Fe.sup. +3 or LiCa x Al 5 -2x Si x O 8 : Fe.sup. +3 wherein 0.005≦x≦0.25 and the iron (Fe.sup. +3 ) activator is present in about 0.001 to 0.013 moles/formula weight of said Li 1 -x Ca 2x Al 5 -x O 8 or said LiCa x Al 5 -2x Si x O 8 .
Claim 3
Dependent Claim
26 words
The phosphor of claim 1 wherein said phosphor is represented by the formula Li 1 -x Ca 2x Al 5 -x O 8 :Fe.sup. +3 .
Claim 4
Dependent Claim
25 words
The phosphor of claim 1 wherein said phosphor is represented by the formula LiCa x Al 5 -2x Si x O 8 :Fe.sup. +3 .
Claim 5
Dependent Claim
9 words
The phosphor of claim 1 wherein x is 0.05.
Claim 6
Dependent Claim
43 words
The phosphor of claim 1 wherein the iron (Fe.sup. +3 ) activator is present in about 0.0075 mole/formula weight of said Li 1 -x Ca 2x Al 5 -x O 8 or said LiCa x Al 5 -2x Si x O 8 .
References Cited (Backward Citations)
US3838060A
Cited
US3836477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |