US3738856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray conversion screen utilizing yttrium oxysulfide phosphor
Assignee: MCI OPTONIX INC A CORP
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Filing: 1972-01-11
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Granted: 1973-06-12
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Expires: 1992-01-11
Abstract
Abstract AN X-RAY CONVERSION SCREEN COMPRISES A SUBSTRATE SHEET HAVING ON A SURFACE THEREOF A PHOSPHOR COATING CONSISTING ESSENTIALLY OF AT LEAST 5% BY WEIGHT OF YTTRIUM OXYSULFIDE ACTIVATED WITH FROM 0.1% TO 10% BY WEIGHT OF TERBIUM OR A MIXTURE OF TERBIUM PLUS DYSPROSIUM. UP TO 95% BY WEIGHT OF THE PHOSPHOR COATING MAY BE (A) GADOLINUM, LATHANUM OR LUTETIUM OXYLSULFIDE PHOSPHOR ACTIVATED WITH TERBIUM OR A MIXTURE OF TERBIUM PLUS DYSPROSIUM, (B) BARIUM PHOSPHATE ACTIVATED WITH DIVALENT EUROPIUM, (C) CALCIUM TUNGSTATE, (D) ZINC SULFIDE OR ZINC CADIUM SULFIDE ACTIVATED WITH COPPER OR SILVER, OR (E) BARIUM LEAD SULFATE.
Inventors
- 👤 F Masi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:07
CPC Classifications
G; G21; G21K; G21K4/00; C; C09; C09K; C09K11/00; C09K11/08; C09K11/58; C09K11/582; C09K11/584; C09K11/66; C09K11/668; C09K11/67; C09K11/68; C09K11/77; C09K11/7728; C09K11/7737; C09K11/7738; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/7771; Y; Y10; Y10T; Y10T428/00; Y10T428/27; Y10T428/273
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |