US3767588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared excitable rare earth oxyfluoride luminescent materials
Assignee: Hitachi Ltd
•
Filing: 1972-01-31
•
Granted: 1973-10-23
•
Expires: 1992-01-31
Abstract
Abstract OXYFLUORIDES OF LANTHANUM, GADOLINIUM, YTTRIUM AND LUTETIUM, ACTIVATED WITH ERBIUM, AND CONTAINING YTTERBIUM AS A SENSITIZER CAN BE EFFICIENTLY EXCITED TO RED LUMINESCENCE BY INFRARED RADIATION, AND CAN BE USED IN CERTAIN LIGHT-PRODUCING APPLICATIONS AND THE COMPOSITION OF THE OXYFLUORIDES CAN BE REPRESENTED BY THE FOLLOWING GENERAL FORMULA: (LN1-Y-ZYBYERZ)OX/2F3-X WHEREIN LN IS AT LEAST ONE ELEMENT SELECTED FROM THE GROUP CONSISTING OF LANTHANUM, GADOLINIUM, YTTRIUM AND LUTETITUM, AND WHEREIN X, Y AND Z ARE 0.4$X$1.3, 0.06$Y $0.35 AND 0.008$Z$0.10, RESPECTIVELY.
Inventors
- 👤 M Nakano
- 👤 T Kano
- 👤 Y Otomo
- 👤 H Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:59
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/777
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |