US3250722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminescent solid solutions of europium compounds with at least one other rare earthcompound
Assignee: EIDP Inc
•
Filing: 1962-04-06
•
Granted: 1966-05-10
•
Expires: 1982-04-06
Abstract
No abstract record available.
Inventors
- 👤 Hans J Borchardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:27
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7784; C09K11/7793; C09K11/7794; C09K11/7795; C09K11/7797
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
A LUMINESCENT COMPOSITION CONSISTING ESSENTIALLY OF SUBSTANTIALLY COLORLESS CRYSTALLINE LUMINOPHOR HAVING A MELTING POINT ABOVE ABOUT 700*C. AND HAVING THE FORMULA:
Claim 2
Dependent Claim
21 words
A LUMINESCENT COMPOSITION CONSISTING ESSENTIALLY OF SUBSTANTIALLY COLORLESS CRYSTALLINE LUMINOPHOR HAVING A MELTING POINT ABOVE ABOUT 700*C. AND HAVING THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |