US3630947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Europium strontium chloride phosphate fluorescent composition
Assignee: EIDP Inc
•
Filing: 1969-10-17
•
Granted: 1971-12-28
•
Expires: 1989-10-17
Abstract
Abstract LUMINESCENT COMPOSITION OF THE FORMULA SP% SR5-XEUX(PO4)OCL WHERE X HAS A VALUE FROM 0.04 TO 0.5; THE COMPOSITIONS ARE PREPARED BY A FLUX-REACTION TECHNIQUE USING SOURCES OF STRONTIUM CHLORIDE, P2O5, AND EUROPIUM OXIDE IN THE PRESENCE OF WATER VAPOR. THE PRODUCT CYSTALLIZES AS COLORLESS NEEDLES HAVING THE P6**3/M SPACE GROUP OF APATITE, UNDER ULTRAVIOLET, X-RAY OR ELECTRON EXCIATION, THE COMPOSTIONS FLUORESCE STRONGLY EMITTING BLUE LIGHT.
Inventors
- 👤 Lothar H Brixner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:02
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/7737; C09K11/7738; C09K11/7739
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |