US3872309A
Expired / Lapsed
US
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Radiographic intensifying screens
Assignee: Agfa Gevaert NV
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Filing: 1972-11-03
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Granted: 1975-03-18
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Expires: 1992-11-03
Abstract
Abstract A radiographic intensifying screen combination suited for use in radiographic recording of information with a silver halide recording material, which combination comprises (1) at least one metallic layer or sheet composed of or containing at least one metal having an atomic number in the range of 46 to 83, and (2) at least one fluorescent layer or sheet, which in working relationship with said metal(s) consists of or contains at least one fluorescent substance within the scope of the following general formula:
Inventors
- 👤 Belder Maurice Hector De
- 👤 Romain Henri Bollen
- 👤 Esch Robert Florent Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:39
CPC Classifications
G; G21; G21K; G21K4/00
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
65 words
A RADIOGRAPHIC INTENSIFYING SCREEN COMBINATION SUITED FOR USE IN RADIOGRAPHIC RECORDING OF INFORMATION WITH A SILVER HALIDE RECORDING MATERIAL, SAID COMBINATION COMPRISING (1) A METALLIC SUBSTRATE INCLUDING AT LEAST ONE METAL HAVING AN ATOMIC NUMBER IN THE RANGE OF 46 TO 83, AND (2) AT LEAST ONE FLUORESCENT SUBSTRATE IN WORKING RELATIONSHIP WITH SAID METAL AND INCLUDING AT LEAST ONE FLUORESCENT SUBSTNACE HAVING THE FORMULA:
Claim 2
Dependent Claim
65 words
A RADIOGRAPHIC INTENSIFYING SCREEN COMBINATION SUITED FOR USE IN RADIOGRAPHIC RECORDING OF INFORMATION WITH A SILVER HALIDE RECORDING MATERIAL, SAID COMBINATION COMPRISING (1) A METALLIC SUBSTRATE INCLUDING AT LEAST ONE METAL HAVING AN ATOMIC NUMBER IN THE RANGE OF 46 TO 83, AND (2) AT LEAST ONE FLUORESCENT SUBSTRATE IN WORKING RELATIONSHIP WITH SAID METAL AND INCLUDING AT LEAST ONE FLUORESCENT SUBSTNACE HAVING THE FORMULA:
Claim 3
Dependent Claim
126 words
at least one fluorescent substrate which is arranged in conjunction with said metallic substrate in such a way that electrons emitted by said metal can penetrate into the fluorescent substrate, said fluorescent substrate containing at least one fluorescent substance having the formula: M(w-n) . M''nOwX wherein: M is at least one of the metals selected from the group consisting of yttrium, lanthanum, gadolinium and lutetium, M'' is at least one of thE rare earth metals selected from the group consisting of dysprosium, erbium, europium, holmium, neodymium, praseodymium, samarium, terbium, thulium and ytterbium, O is oxygen, X is a member of the group selected from sulphur and halogen, n is 0.0002 to 0.2, and w is 1 when X is halogen and 2 when X is sulphur.
Claim 4
Dependent Claim
126 words
at least one fluorescent substrate which is arranged in conjunction with said metallic substrate in such a way that electrons emitted by said metal can penetrate into the fluorescent substrate, said fluorescent substrate containing at least one fluorescent substance having the formula: M(w-n) . M''nOwX wherein: M is at least one of the metals selected from the group consisting of yttrium, lanthanum, gadolinium and lutetium, M'' is at least one of thE rare earth metals selected from the group consisting of dysprosium, erbium, europium, holmium, neodymium, praseodymium, samarium, terbium, thulium and ytterbium, O is oxygen, X is a member of the group selected from sulphur and halogen, n is 0.0002 to 0.2, and w is 1 when X is halogen and 2 when X is sulphur.
Claim 5
Dependent Claim
37 words
An intensifying screen combination according to claim 1, in which said metallic substrate mainly contains a member of the group consisting of silver, tin, tellurium, thallium, tungsten, platinum, gold, mercury, tantalum, lead and bismuth and mixtures thereof.
Claim 6
Dependent Claim
38 words
An intensifying screen combination according to claim 1, wherein the fluorescent substrate includes a substance in which absorbed X-ray radiation effects therein the emission of fluorescent light of wavelength bands situated in the 320 to 450 nm range.
Claim 7
Dependent Claim
36 words
An intensifying screen combination according to claim 1, wherein the fluorescent substrate includes a substance in which absorbed X-ray radiation effects therein the emission of fluorescent light of wavelength bands situated in the 450-570 nm range.
Claim 8
Dependent Claim
36 words
An intensifying screen combination according to claim 1, wherein the fluorescent substrate includes a substance in which absorbed X-ray radiation effects therein the emission of fluorescent light of wavelength bands situated in the 550-700 nm range.
Claim 9
Dependent Claim
18 words
An intensifying screen combination according to claim 1, wherein the fluorescent substrate includes yttriUm oxysulphide activated with terbium.
Claim 10
Dependent Claim
27 words
An intensifying screen combination according to claim 1, wherein the fluorescent substrate includes a member of the group consisting of gadolinium and lanthanum oxysulphide activated with terbium.
Claim 11
Dependent Claim
22 words
An intensifying screen combination according to claim 1, wherein the fluorescent substrate includes a oxysulphide of yttrium and lanthanum activated with europium(III).
Claim 12
Dependent Claim
21 words
An intensifying screen combination according to claim 1, which includes a plurality of metallic substrates having the same or different composition.
Claim 13
Dependent Claim
21 words
An intensifying screen combination according to claim 1, which includes a plurality of fluorescent substrates having the same or different composition.
Claim 14
Dependent Claim
28 words
An intensifying screen combination according to claim 1, wherein the metallic substrate is supported by a member of the group consisting of paper, glass, cloth and plastic film.
Claim 15
Dependent Claim
26 words
An intensifying screen combination according to claim 1, wherein the fluorescent substrate contains a mixture of different fluorescent substances included within the formula of claim 1.
Claim 16
Dependent Claim
30 words
An intensifying screen combination according to claim 1, wherein the thickness of the fluorescent substrate is from 0.05 to 0.5 mm and the fluorescent substance is dispersed in a binder.
Claim 17
Dependent Claim
18 words
An intensifying screen combination according to claim 13, wherein said binder is an organic high molecular weight polymer.
Claim 18
Dependent Claim
27 words
An intensifying screen combination according to claim 13, wherein the fluorescent substance dispersed in said binder has a grain size ranging from 5 to 50 Mu .
Claim 19
Dependent Claim
16 words
An intensifying screen combination according to claim 1, wherein the fluorescent substrate includes a screening dye.
Claim 20
Dependent Claim
27 words
An intensifying screen combination according to claim 1, wherein the fluorescent substrate is coated with a protective polymer having a thickness ranging from 0.001 to 0.05 mm.
Claim 21
Dependent Claim
34 words
An intensifying screen combination according to claim 1, wherein the metallic substrate and the fluorescent or sheet substrate are incorporated in a composite screen material in which the said substrates are in adhering relationship.
Claim 22
Dependent Claim
24 words
An intensifying screen combination according to claim 18, wherein the metallic substrate is supported by the same support used to support the fluorescent substrate.
Claim 23
Dependent Claim
21 words
An intensifying screen combination according to claim 19, wherein the metallic substrate is interposed between the support and the fluoresecent substrate.
Claim 24
Dependent Claim
28 words
An intensifying screen combination according to claim 20, wherein the metallic substrate is fixed to the support and to the fluorescent substrate by means of an adhesive layer.
Claim 25
Dependent Claim
20 words
An intensifying screen combination according to claim 21, wherein the thickness of said adhesive layer is below 10 Mu .
Claim 26
Dependent Claim
30 words
An intensifying screen combination according to claim 22, wherein the adhesive layer is composed of a member of the group consisting of synthetic rubber, polyvinyl butyral, and an alkyd resin.
Claim 27
Independent Claim
48 words
A method of recording information comprising the steps of information-wise irradiating an intensifying screen to X-rays or gamma-rays and of receiving the fluorescent light emitted by the intensifying screen onto a photographic material which is sensitive to said fluorescent light, wherein in said method the intensifying screen comprises:
Claim 28
Independent Claim
48 words
A method of recording information comprising the steps of information-wise irradiating an intensifying screen to X-rays or gamma-rays and of receiving the fluorescent light emitted by the intensifying screen onto a photographic material which is sensitive to said fluorescent light, wherein in said method the intensifying screen comprises:
Claim 29
Dependent Claim
13 words
A method according to claim 24, wherein the photographic material contains silver halide.
Claim 30
Dependent Claim
25 words
A method according to claim 24, wherein the fluorescent substrate includes a member of the group consisting of gadolinium and lanthanum oxysulphide activated with terbium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |