US3883747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray intensifying screen
Assignee: 3M Co
•
Filing: 1973-12-06
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Granted: 1975-05-13
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Expires: 1993-12-06
Abstract
Abstract An X-ray intensifying screen having high radiographic acutance consisting essentially of a supported layer of a transparent binder having dispersed in it a phosphor and a dye which preferentially absorbs green light, the phosphor having the formula (M1 x Tbx)2 O2S in which M is selected from the group consisting of gadolinium, lanthanum and yttrium and x has a value in the range about 0.003 to 0.08.
Inventors
- 👤 Robert H Murashige
- 👤 Henry L Myers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:07
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/7771; G; G21; G21K; G21K4/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
66 words
AN X-RAY INTENSIFICATION SCREEN COMPRISING A SUBSTRATE SUPPORT COATED WITH DISPERSION OF A PHOSPHOR HAVING THE FORMULA (MX-1 TBX)2 O2S WHEREIN M IS LANTHANUM, GADOLINIUM OR YTTRIUM AND X HAS A VALUE IN THE RANGE 0.003 TO 0.08 AND A DYE PREFERENTIALLY ABSORBING GREEN LIGHT IN A TRANSPARENT BINDER, THE DYE CONTENT BEING EQUAL TO FROM 0.0003 TO 0.5 PERCENT BY WEIGHT OF THE CONTAINED PHOSPHOR.
Claim 2
Dependent Claim
66 words
AN X-RAY INTENSIFICATION SCREEN COMPRISING A SUBSTRATE SUPPORT COATED WITH DISPERSION OF A PHOSPHOR HAVING THE FORMULA (MX-1 TBX)2 O2S WHEREIN M IS LANTHANUM, GADOLINIUM OR YTTRIUM AND X HAS A VALUE IN THE RANGE 0.003 TO 0.08 AND A DYE PREFERENTIALLY ABSORBING GREEN LIGHT IN A TRANSPARENT BINDER, THE DYE CONTENT BEING EQUAL TO FROM 0.0003 TO 0.5 PERCENT BY WEIGHT OF THE CONTAINED PHOSPHOR.
Claim 3
Dependent Claim
30 words
An X-ray intensification screen as defined in claim 1 wherein the dye content of the dispersion is in the range 0.001 to 0.1 percent by weight of the contained phosphor.
Claim 4
Dependent Claim
22 words
An X-ray intensification screen as defined in claim 1 wherein M is gadolinium and x is in the range 0.003 to 0.015.
Claim 5
Dependent Claim
37 words
An X-ray intensification screen as defined in claim 1 wherein M is gadolinium, x is in the range 0.003 to 0.015 and the dye content is from 0.001 to 0.1 percent by weight of the contained phosphor.
References Cited (Backward Citations)
US3738856A
Cited
US3783298A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |