US3650976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed alkaline earth sulfate phosphor compositions
Assignee: Eastman Kodak Co
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Filing: 1969-10-21
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Granted: 1972-03-21
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Expires: 1989-10-21
Abstract
Abstract NOVELS PHOSPHORS COMPRISING LANTHANIDE-ACTIVATED PLURAL MIXED ALKALINE EARTH SULFATES SUCH AS EUROPIUMACTIVATED STRONTIUM BARIUM SULFATE, ARE PREPARED BY THE COPRECIPITATION OF THE LANTHANIDE ION AND SAID PLURAL ALKALINE EARTH IONS IN DILUTE SOLUTION. THE PHOSPHORS SHOW HIGH EFFICIENCY OF FLUORESCENCE WHEN EXCITED BY X-RAYS AND ARE PARTICULARLY USEFUL IN INTENSIFYING SCREENS IN COMBINATION WITH RADIOGRAPHIC IMAGE RECORDING ELEMENTS.
Inventors
- 👤 George W Luckey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:45
CPC Classifications
G; G21; G21K; G21K4/00; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7713
Claims Analysis
Total Claims: 0
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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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |