Patent US3014874A successfully refreshed from Google Patents.
US3014874A
Expired / Lapsed
US
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Alkaline earth halophosphate phosphors
Assignee: EMI Group Ltd
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Filing: 1956-07-20
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Granted: 1961-12-26
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Expires: 1976-07-20
Abstract
No abstract record available.
Inventors
- 👤 Ranby Peter Whitten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:19
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7715; C09K11/7723; C09K11/7724; C09K11/7725
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
AN ARTIFICIAL LUMINESCENT MATERIAL COMPRISING A HALOPHOSPHATE OF AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM, STRONTIUM AND MIXTURES THEREOF, HAVING AN APATITE CRYSTAL STRUCTURE AS DETERMINED BY X-RAY ANALYSIS AND HAVING INCORPORATED THEREIN AN ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF CERIUM AND BOTH CERIUM AND MANGANESE TOGETHER, WHEREIN THE PROPORTIONS BY WEIGHT OF ASCERTAINABLE CALCIUM AND ASCERTAINABLE STRONTIUM EXPRESSED COLLECTIVELY AS CALCIUM OXIDE IS 13 TO 50% AND THE PHOSPHORUS EXPRESSED AS PHOSPHORIUS PENTOXIDE IS 36 TO 44% AND THE HALIDE EXPRESSED AS CALCIUM HALIDE IS 11 TO 47%.
Claim 2
Dependent Claim
94 words
AN ARTIFICIAL LUMINESCENT MATERIAL COMPRISING A HALOPHOSPHATE OF AT LEAST ONE METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM, STRONTIUM AND MIXTURES THEREOF, HAVING AN APATITE CRYSTAL STRUCTURE AS DETERMINED BY X-RAY ANALYSIS AND HAVING INCORPORATED THEREIN AN ACTIVATOR SELECTED FROM THE GROUP CONSISTING OF CERIUM AND BOTH CERIUM AND MANGANESE TOGETHER, WHEREIN THE PROPORTIONS BY WEIGHT OF ASCERTAINABLE CALCIUM AND ASCERTAINABLE STRONTIUM EXPRESSED COLLECTIVELY AS CALCIUM OXIDE IS 13 TO 50% AND THE PHOSPHORUS EXPRESSED AS PHOSPHORIUS PENTOXIDE IS 36 TO 44% AND THE HALIDE EXPRESSED AS CALCIUM HALIDE IS 11 TO 47%.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-25 | 1965-06-26 | 1965-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-25 | 1969-06-26 | 1969-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-25 | 1973-06-26 | 1973-12-26 | $7700.00 | Window Closed / Lapsed |