Patent US3563909A successfully refreshed from Google Patents.
US3563909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing a lanthanide activated yttrium,gadolinium or lanthanum oxysulfide luminescent material
Assignee: US Philips Corp
•
Filing: 1968-03-29
•
Granted: 1971-02-16
•
Expires: 1988-03-29
Abstract
Abstract A YTTRIUM, GADOLINIUM OR LANTHANUM OXYSULFIDE PHOSPHOR ACTIVATED WITH A LANTHANIDE ELEMENT IS PRODUCED BY THE HEATING OF A MIXTURE OF THE OXIDES OF THE METALS AND SODIUM OR POTASSIUM RHODANIDE.
Inventors
- 👤 Roelof Egbert Schuil
- 👤 Johannes Aloysius Mari Dikhoff
- 👤 Dirk Barneveld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:12
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/7771; C01; C01F; C01F17/00; C01F17/20; C01F17/288; C01F17/294
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |