Patent US2757144A successfully refreshed from Google Patents.
US2757144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluoride phosphors
Assignee: RCA Corp
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Filing: 1954-02-24
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Granted: 1956-07-31
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Expires: 1974-02-24
Abstract
No abstract record available.
Inventors
- 👤 Edward L Lind
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:02
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/61; C09K11/615; C09K11/616
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
39 words
A LUMINESCENT MATERIAL HAVING THE MOLAR COMPOSITION ACAF2-BMF2''CBD''2; DMN WHERE A+B=1, A IS 0.75-1.00, C IS 0.01-9, D IS 0.0006-0.12 AND M IS AN ELEMENT SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM, ZINC, STRONTIUM, CADMIUM, BARIUM, MERCURY, AND RADIUM.
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) | 1959-07-31 | 1960-01-30 | 1960-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-31 | 1964-01-30 | 1964-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-31 | 1968-01-30 | 1968-07-31 | $7700.00 | Window Closed / Lapsed |