US3855035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image intensifier plate and method and compositions for manufacturing same
Assignee: Varian Medical Systems Inc
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Filing: 1972-06-22
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Granted: 1974-12-17
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Expires: 1992-06-22
Abstract
Abstract An image intensifier plate for X-ray radiology formed of a transparent moisture impermeable substrate having a thickness within the range of 2-8 mils, a phosphor layer present as a coating on one surface of the substrate formed of activated particles, such as alkali metal halides and preferably, cesium iodide having an average dimension within the range of 2-10 microns and a protective moisture impermeable coating on the surface of the phosphor layer and in which the cesium iodide or other activated particles are eutectically bonded to a pack density greater than 70 percent.
Inventors
- 👤 C Bates
- 👤 J Eidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:23
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/28; B32B27/283; B32B15/00; B32B15/01; B32B15/012; B32B15/04; B32B15/08; B32B15/12; B32B27/10; G; G21; G21K; G21K4/00; B32B2311/00; B32B2311/24; B32B2367/00; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/258; Y10T428/26; Y10T428/266; Y10T428/31; Y10T428/315; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
119 words
IN THE METHOD OF PRODUCING AN IMAGE INTENSIFIER PLATE COMPRISING THE STEPS OF COATING A TRANSPARENT, MOISTURE IMPERMEABLE SUBSTRATE FORMED OF GLASS OR PLASTIC HAVING A THICKNESS WITHIN THE RANGE OF 2-8 MILS WITH ACTIVATED CESIUM IODIDE PARTICLES HAVING AN AVERAGE PARTICLE SIZE WITHIN THE RANGE OF 2-10 MICRONS TO A PACK DENSITY GREATER THAN 70 PERCENT, HEATING THE COATED SUBSTRATE TO A TEMPERATURE ABOVE 350*C BUT BELOW THE FUSION TEMPERATURE FOR THE PARTICLES TO BURN OUT ORGANIC COMPONENTS FROM THE COATING AND SET THE BINDER, AND SEALING THE COATING WITH A MOSITURE IMPERMEABLE LAYER ON THE SIDE OPPOSITE THE SUBSTRATE IN WHICH THE MOISTURE IMPERMEABLE LAYER IS SELECTED FROM THE GROUP CONSISTING OF A METAL, GLASS AND PLASTIC.
Claim 2
Dependent Claim
119 words
IN THE METHOD OF PRODUCING AN IMAGE INTENSIFIER PLATE COMPRISING THE STEPS OF COATING A TRANSPARENT, MOISTURE IMPERMEABLE SUBSTRATE FORMED OF GLASS OR PLASTIC HAVING A THICKNESS WITHIN THE RANGE OF 2-8 MILS WITH ACTIVATED CESIUM IODIDE PARTICLES HAVING AN AVERAGE PARTICLE SIZE WITHIN THE RANGE OF 2-10 MICRONS TO A PACK DENSITY GREATER THAN 70 PERCENT, HEATING THE COATED SUBSTRATE TO A TEMPERATURE ABOVE 350*C BUT BELOW THE FUSION TEMPERATURE FOR THE PARTICLES TO BURN OUT ORGANIC COMPONENTS FROM THE COATING AND SET THE BINDER, AND SEALING THE COATING WITH A MOSITURE IMPERMEABLE LAYER ON THE SIDE OPPOSITE THE SUBSTRATE IN WHICH THE MOISTURE IMPERMEABLE LAYER IS SELECTED FROM THE GROUP CONSISTING OF A METAL, GLASS AND PLASTIC.
Claim 3
Dependent Claim
25 words
The method as claimed in claim 1 in which the activated particles of cesium iodide are activated with sodium iodide CsI(Na) or thallium iodide CsI(Tl).
Claim 4
Dependent Claim
78 words
The method as claimed in claim 2 in which the CsI(Na) and CsI(Tl) of the desired particle size are prepared by dissolving cesium iodide in water to form a substantially saturated solution plus a small amount of sodium or thallium halide, admixing the solution with agitation with an alcohol in which the cesium iodide is insoluble and which has been prEcooled to a temperature within the range of -50* C to -85*C to precipitate the CsI(Na) or CsI(Tl).
Claim 5
Dependent Claim
14 words
The method as claimed in claim 3 in which the alcohol is isopropyl alcohol.
Claim 6
Dependent Claim
29 words
The method as claimed in claim 3 in which the precipitated particles are annealed by heating to a temperature above 350*C but below the fusion temperature for the particles.
Claim 7
Dependent Claim
21 words
The method as claimed in claim 5 in which the particles are heated to a temperature within the range of 525*-550*C.
Claim 8
Dependent Claim
33 words
The method as claimed in claim 3 in which the cesium iodide solution includes colloidal silica in an amount within the range of 0.5 to 2 percent by weight of the cesium iodide.
Claim 9
Dependent Claim
43 words
The method as claimed in claim 1 in which the heating step includes heating the coating to a temperature above 500*C but below the fusion temperature of the activated particles, if the activated particles have not previously been subjected to an annealing step.
Claim 10
Dependent Claim
21 words
The method as claimed in claim 1 in which the sealing layer is a sheet of aluminum which is pin-hole free.
Claim 11
Dependent Claim
22 words
The method as claimed in claim 1 in which the sealing layer includes a reflective surface on the side adjacent the coating.
Claim 12
Dependent Claim
22 words
The method as claimed in claim 1 in which the coating of activated cesium iodide is applied to the substrate by spraying.
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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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |