Patent US4138361A successfully refreshed from Google Patents.
US4138361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation-conversion screens
Assignee: Agfa Gevaert NV
•
Filing: 1977-03-08
•
Granted: 1979-02-06
•
Expires: 1997-03-08
Abstract
Abstract A composition of matter such as an X-ray image intensifying screen which includes halide-containing phosphor particles which are admixed or combined with or have reacted with at least one metal-organic substance such that the fluorescence power of said phosphor particles is less liable to be adversely affected by moisture.
Inventors
- 👤 Andre R. Suys
- 👤 Willy K. Van Landeghem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:17
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/777; C09K11/7771; G; G21; G21K; G21K4/00
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
137 words
A composition of matter which includes halide containing phosphor particles selected from the group consisting of (1) halide-containing rare earth metal compounds in which the host metal of the phosphor is a rare earth metal and the activator consists of one or more other rare-earth metals; (2) barium fluoride-chloride activated with europium (II), and (3) a cesium iodide, said particles being combined with at least one metal-organic substance in an amount whereby the fluorescence power of said phosphor particles is more resistant to adverse affects of moisture thereon in comparison to an identical composition of matter which does not include said metal-organic substance wherein said metal-organic substance is a member selected from the group consisting of: (A) water-insoluble metal carboxylates, (B) water-insoluble mercaptides, and (C) organo-metallic compounds selected from the group consisting of organoantimony, organobismuth and organotin.
Claim 2
Dependent Claim
137 words
A composition of matter which includes halide containing phosphor particles selected from the group consisting of (1) halide-containing rare earth metal compounds in which the host metal of the phosphor is a rare earth metal and the activator consists of one or more other rare-earth metals; (2) barium fluoride-chloride activated with europium (II), and (3) a cesium iodide, said particles being combined with at least one metal-organic substance in an amount whereby the fluorescence power of said phosphor particles is more resistant to adverse affects of moisture thereon in comparison to an identical composition of matter which does not include said metal-organic substance wherein said metal-organic substance is a member selected from the group consisting of: (A) water-insoluble metal carboxylates, (B) water-insoluble mercaptides, and (C) organo-metallic compounds selected from the group consisting of organoantimony, organobismuth and organotin.
Claim 3
Dependent Claim
52 words
A composition according to claim 1, wherein said metal-organic substance corresponds to the following formula: R.sub.m.SnX.sub.4-m wherein: R is a hydrocarbon group, X is one to three electronegative substituents, m is 1, 2 or 3, excluding X being three, two or one halogen atom(s) when m is respectively 1, 2 or 3.
Claim 4
Dependent Claim
31 words
A composition according to claim 2, wherein X is an alkoxy or a carboxylate group or X is sulphur or a water-repelling sulphur-containing substituent linked through sulphur to the tin atom.
Claim 5
Dependent Claim
18 words
A composition according to claim 2, wherein X is a thioether, a mercaptide group or a xanthate group.
Claim 6
Dependent Claim
27 words
A composition according to claim 4, wherein said metal-organic substance is dibutyltin maleate, dibutyltin lauryl mercaptide, dibutyltin S,S'-bis(n-octyl mercapto acetate), di(n-octyl)-tin S,S'-bis(iso-octyl mercaptoacetate) or dibutyltin bis (β-mercaptopropionate).
Claim 7
Dependent Claim
44 words
A composition according to claim 1, wherein at least a part of the halide-containing phosphor particles are halide-containing rare-earth metal compounds in which the host metal of the phosphor is a rare-earth metal and the activator consists of one or more other rare-earth metals.
Claim 8
Dependent Claim
37 words
A composition according to claim 6, wherein the host metal is yttrium, gadolinium, lanthanum or cerium and the activator metal at least one of the metals of the group of terbium, europium, dysprosium, thulium, samarium and ytterbium.
Claim 9
Dependent Claim
70 words
A composition according to claim 6, wherein the rare-earth metal compound corresponds to one of the following formulae: La.sub.(1-n) Tb.sub.n.sup.3+ OX wherein X is halogen such as e.g. chlorine, bromine, or fluorine, and n is from 0.006 to 0.0001, or La.sub.(1-w-y) OX: Tb.sub.w Yb.sub.y wherein X is chlorine or bromine w is 0.0005 to 0.006 mole of the oxyhalide, and y is 0.00005 to 0.005 per mole of the oxyhalide.
Claim 10
Dependent Claim
16 words
A composition according to claim 1, wherein said metal-organic substance comprises one or more organometallic compounds.
Claim 11
Dependent Claim
19 words
A composition according to claim 1, wherein said metal-organic substance is present at the surfaces of the phosphor particles.
Claim 12
Dependent Claim
20 words
A composition according to claim 1, wherein the phosphor particles bearing said metal organic substances are dispersed in a binder.
Claim 13
Dependent Claim
23 words
A composition according to claim 1, wherein said metal-organic substance is a colorless compound and yields colorless compounds on reaction with hydrogen chloride.
Claim 14
Dependent Claim
15 words
A composition according to claim 1, wherein said metal-organic substance is a water-insoluble metal carboxylate.
Claim 15
Dependent Claim
27 words
A composition according to claim 13, wherein said carboxylate is a bi- or trivalent metal salt of an aliphatic carboxylic acid having at least 7 carbon atoms.
Claim 16
Dependent Claim
17 words
A composition according to claim 14, wherein said salt is a barium, lead, cadmium or zinc salt.
Claim 17
Dependent Claim
14 words
A composition according to claim 1, wherein said metal-organic substance is a water-insoluble mercaptide.
Claim 18
Dependent Claim
32 words
A composition according to claim 16, wherein said mercaptide is a tin mercaptide corresponding to the following general formula: ##STR4## wherein: R is a hydrocarbon group containing at least 4 carbon atoms.
Claim 19
Dependent Claim
29 words
A composition according to claim 1, wherein said metal-organic substance is an organo-metallic compound which will react with a labile or weakly bound halogen substituent and/or with hydrogen chloride.
Claim 20
Dependent Claim
15 words
A composition according to claim 1, wherein said metal-organic substance is triphenylantimony, triphenylbismuth or tetraphenyltin.
Claim 21
Dependent Claim
24 words
A composition according to claim 1, wherein at least a part of the halide-containing phosphor particles are barium fluoride chloride particles activated with europium(II).
Claim 22
Dependent Claim
21 words
A composition according to claim 1, wherein at least a part of the halide-containing phosphor particles are sodium-activated cesium iodide particles.
Claim 23
Dependent Claim
46 words
A composition according to claim 1, wherein the phosphor particles and said metal-organic substance are present in a binder medium composed of a cellulose acetate butyrate, a polyalkyl (meth)acrylate, a polyvinyl-n-butyral, a copoly(vinyl acetate/vinyl chloride), a copoly(acrylonitrile/butadiene/styrene) or a copoly(vinyl chloride/vinyl acetate/vinyl alcohol) or mixtures thereof.
Claim 24
Dependent Claim
19 words
The composition of matter of claim 1 wherein said particles and metal-organic substance are combined as a physical admixture.
Claim 25
Dependent Claim
18 words
The composition of matter of claim 1 wherein said particles and metal-organic substance are combined by chemical reaction.
Claim 26
Dependent Claim
68 words
The composition of matter of claim 1 in which the organo-metallic substance is an organo-metallic compound selected from the group consisting of triphenylantimony, triphenylbismuth, tetraphenyltin and compounds of the formula: R.sub.m SnX.sub.4-m wherein: R is a hydrocarbon group, X is one to three electronegative substituents, m is 1, 2, or 3, excluding X being three two or one halogen atom(s) when m is respectively 1, 2, or 3.
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) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |