Patent US2772241A successfully refreshed from Google Patents.
US2772241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halophosphate phosphors
Assignee: EMI Group Ltd
•
Filing: 1951-03-10
•
Granted: 1956-11-27
•
Expires: 1971-03-10
Abstract
No abstract record available.
Inventors
- 👤 Ranby Peter Whitten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:45
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/70; C09K11/72; C09K11/73
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
128 words
AN ARTIFICIAL LUMINESCENT MATERIAL CONSISTING ESSENTIALLY OF A HALOPHOSPHSTE OF AT LEAST ONE OF THE METALS IN THE GROUP CONSISTING OF CALCIUM, STRONTIUM, BARIUM, ZINC AND CADMIUM, THE HALOGEN IN THE HALOPHOSPHATE BEING SELECTED FROM THE GROUP CONSISTING OF FLUORINE, AND FLUORINE PLUS CHLORINE, THE AMOUNT OF FLUORINE BEING GREATER THAN THE AMOUNT OF CHLORINE, AND AN ACTIVATOR, SELECTED FROM THE GROUP CONSISTING OF SILVER, AND SILVER AND MANGANESE TOGETHER, THE PROPORTIONS OF THE INGREDIENTS BEING SUCH THAT THE GRAM-ATOM RATIO OF THE METALS TO PHOSPHORUS IS BETWEEN 50/50 AND 50/30 INCLUSIVE, THE GRAM-ATOM RATIO OF METALS-PLUS-PHOSPHORUS TO HALOGEN BEING BETWEEN 1/0.05 AND 1/0.5, INCLUSIVE, THE SILVER CONTENT BEING BETWEEN 0.01% AND 5%, INCLUSICE, BY WEIGHT, AND THE MANGANESE CONTENT BEING BETWEEN ZERO AND 10%, INCLUSIVE, BY WEIGHT.
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) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |