US3758486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rare earth niobate composition
Assignee: Philips North America LLC
•
Filing: 1969-05-13
•
Granted: 1973-09-11
•
Expires: 1989-05-13
Abstract
Abstract LUMINESCENT COMPOSITIONS OF THE SYSTEM COMPRISING YTTRIUM, LANTHANUM, GADOLINIUM, OR COMBINATIONS THEREOF, NIOBATE ACTIVATED BY SELECTED RARE EARTH METALS ARE SPECIFIED. THE ORTHONIOBATE IS THE PREFERRED COMPOSITION AND IS PROVIDED BY UTILIZING A 1:1 GRAM ATOM RATIO OF YTTRIUM, LANTHANUM, AND GADOLINIUM TO NIOBIUM. LUMINESCENT COMPOSITIONS OF THE SYSTEM ARE ALL EXCITED BY ULTRAVIOLET RADIATION WITH THE EMISSION CHARACTERISTIC DEPENDING UPON THE PARTICULAR SELECTED RARE EARTH METAL ACTIVATOR.
Inventors
- 👤 R Ropp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:30
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |