US5507976A
Expired / Lapsed
US
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Stabilized phosphor intermediates, storage phosphors, radiation image storage panels, and preparation methods
Assignee: Carestream Health Inc
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Filing: 1994-09-02
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Granted: 1996-04-16
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Expires: 2014-09-02
Abstract
Abstract A radiographic image storage phosphor, stabilized intermediate, and methods for preparing storage phosphor, and stabilized intermediate. The storage phosphor is the product of firing a combination of species characterized by the relationship: MFX1-zIz.uMaXa:yA:eQ:tD wherein M is selected from Mg, Ca, Sr, and Ba; X is selected from Cl and Br; Ma is selected from Na, K, Rb, and Cs; Xa is selected from F, Cl, Br, and I; A is selected from Eu, Ce, Sm, and Tb; Q is selected from BeO, MgO, CaO, SrO, BaO, ZnO, Al2O3, La2O3, In2O3, SiO2, TiO2, ZrO2, GeO2, SnO2, Nb2O5, Ta2O5, and ThO2; D is selected from V, Cr, Mn, Fe, Co, and Ni; z is from 1 x10-4 to 1; u is from 0 to 1; y is from 1x10-4 to 0.1; e is from 0 to 1; and t is from 0 to 10-2; and oxosulfur reducing agent for iodine, which is present in an amount sufficient to increase relative photostimulated luminescence intensities relative to the phosphor defined above absent the reducing agent for iodine.
Inventors
- 👤 Joseph F. Bringley
- 👤 Philip S. Bryan
- 👤 Andrea M. Hyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:57
CPC Classifications
G; G21; G21K; G21K4/00; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7715; C09K11/7719; C09K11/772; C09K11/7722; C09K11/7728; C09K11/7732; C09K11/7733; C09K11/7736; C09K11/7743; C09K11/7747; C09K11/7748; C09K11/7751; C09K11/7759; C09K11/7762; C09K11/7763; C09K11/7765; G21K2004/06
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
265 words
A storage phosphor consisting essentially of the product of firing, at a temperature from about 700° to 1300° C., a combination of species characterized by the relationship: MFX.sub.1-z I.sub.z.uM.sup.a X.sup.a :yA:eQ:tD wherein M is selected from the group consisting of Mg, Ca, Sr, and Ba and combinations thereof; X is selected from the group consisting of Cl and Br and combinations thereof; Ma is selected from the group consisting of Na, K, Rb, and Cs and combinations thereof; Xa is selected from the group consisting of F, Cl, Br, and I and combinations thereof; A is selected from the group consisting of Eu, Ce, Sm, and Tb and combinations thereof; Q is selected from the group consisting of BeO, MgO, CaO, SrO, BaO, ZnO, Al 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and ThO 2 and combinations thereof; D is selected from the group consisting of V, Cr, Mn, Fe, Co, and Ni and combinations thereof; z is from 1×10 -4 to 1; u is from 0 to 1; y is from 1×10 -4 to 0.1; e is from 0 to 1; and t is from 0 to 1×10 -2 ; and oxosulfur reducing agent for iodine, wherein said oxosulfur reducing agent for iodine is present with said combination of species in an amount sufficient to increase relative photostimulated luminescence intensities relative to the phosphor defined above absent said reducing agent for iodine.
Claim 2
Dependent Claim
265 words
A storage phosphor consisting essentially of the product of firing, at a temperature from about 700° to 1300° C., a combination of species characterized by the relationship: MFX.sub.1-z I.sub.z.uM.sup.a X.sup.a :yA:eQ:tD wherein M is selected from the group consisting of Mg, Ca, Sr, and Ba and combinations thereof; X is selected from the group consisting of Cl and Br and combinations thereof; Ma is selected from the group consisting of Na, K, Rb, and Cs and combinations thereof; Xa is selected from the group consisting of F, Cl, Br, and I and combinations thereof; A is selected from the group consisting of Eu, Ce, Sm, and Tb and combinations thereof; Q is selected from the group consisting of BeO, MgO, CaO, SrO, BaO, ZnO, Al 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and ThO 2 and combinations thereof; D is selected from the group consisting of V, Cr, Mn, Fe, Co, and Ni and combinations thereof; z is from 1×10 -4 to 1; u is from 0 to 1; y is from 1×10 -4 to 0.1; e is from 0 to 1; and t is from 0 to 1×10 -2 ; and oxosulfur reducing agent for iodine, wherein said oxosulfur reducing agent for iodine is present with said combination of species in an amount sufficient to increase relative photostimulated luminescence intensities relative to the phosphor defined above absent said reducing agent for iodine.
Claim 3
Dependent Claim
30 words
The storage phosphor of claim 1 wherein said oxosulfur reducing agent is selected from the group consisting of oxosulfur species having the general formula S j O k wherein 0.25<j/k<1.0.
Claim 4
Dependent Claim
56 words
The storage phosphor of claim 1 wherein said reducing agent is selected from the group consisting of: inorganic and organic salts of SO 3 2- , S 2 O 4 2- , S 2 O 3 2- , S 2 O 5 2- , and S 4 O 6 2- and Bunte salts and combinations thereof.
Claim 5
Dependent Claim
13 words
The storage phosphor of claim 1 wherein said reducing agent comprises thiosulfate salt.
Claim 6
Dependent Claim
8 words
The storage phosphor of claim 1 wherein t=0.
Claim 7
Dependent Claim
236 words
The storage phosphor of claim 1 further characterized as the product of firing a composition of matter consisting essentially of oxosulfur reducing agent for iodine, and a combination of species characterized by the relationship: (Ba.sub.1-a-b-c Mg.sub.a Ca.sub.b Sr.sub.c)FX.sub.1-z I.sub.z.rM.sup.a X.sup.a :YA:eQ wherein X is selected from the group consisting of Cl and Br and combinations thereof; M a is selected from the group consisting of Na, K, Rb, and Cs and combinations thereof; X a is selected from the group consisting of F, Cl, Br, and I and combinations thereof; A is selected from the group consisting of Eu, Ce, Sm, and Tb and combinations thereof; Q is selected from the group consisting of BeO, MgO, CaO, SrO, BaO, ZnO, Al 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and ThO 2 and combinations thereof; a+b+c is from 0 to 0.4; z is from 1×10 -4 to 1; r is from 1×10 -6 to 0.1; y is from 1×10 -4 to 0.1; e is from 1×10 -5 to 0.1; and wherein said oxosulfur reducing agent for iodine is present with said combination of species in an amount sufficient to increase relative photostimulated luminescence intensities relative to the phosphor defined above absent said oxosulfur reducing agent.
Claim 8
Dependent Claim
33 words
The storage phosphor of claim 6 wherein said reducing agent is selected from the group consisting of the group consisting of oxosulfur species having the general formula S j O k wherein 0.25<j/k1.0.
Claim 9
Dependent Claim
53 words
The storage phosphor of claim 6 wherein said reducing agent is selected from the group consisting of: salts of SO 3 2- , S 2 O 4 2- , S 2 O 3 2- , S 2 O 5 2- , and S 4 O 6 2- and Bunte salts and combinations thereof.
Claim 10
Dependent Claim
13 words
The storage phosphor of claim 6 wherein said reducing agent comprises thiosulfate salt.
Claim 11
Dependent Claim
29 words
The storage phosphor of claim 6 wherein said reducing agent is present in said phosphor in a molar ratio of sulfur to alkaline earth metal of less than 0.020.
Claim 12
Dependent Claim
29 words
The storage phosphor of claim 1 wherein said reducing agent is present in said phosphor in a molar ratio of sulfur to alkaline earth metal of less than 0.020.
Claim 13
Dependent Claim
33 words
The storage phosphor of claim 1 wherein said reducing agent is present in said composition of matter in a molar ratio of sulfur to alkaline earth metal of from 1×10 -4 to 0.020.
Claim 14
Dependent Claim
288 words
A storage phosphor comprising the product of firing, at a temperature from about 700° to 1300° C., a composition of matter consisting essentially of oxosulfur reducing agent for iodine, and a combination of species characterized by the relationship: (Ba.sub.1-a-b-c Mg.sub.a Ca.sub.b Sr.sub.c)FX.sub.1-z I.sub.z.rM.sup.a X.sup.a :yA:eQ wherein X is selected from the group consisting of Cl and Br and combinations thereof; M a is selected from the group consisting of Na, K, Rb, and Cs and combinations thereof; X a is selected from the group consisting of F, Cl, Br, and I and combinations thereof; A is selected from the group consisting of Eu, Ce, Sm, and Tb and combinations thereof; Q is selected from the group consisting of BeO, MgO, CaO, SrO, BaO, ZnO, Al 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and ThO 2 and combinations thereof; a+b+c is from 0 to 0.4; z is from 1×10 -4 to 1; r is from 1×10 -6 to 0.1; y is from 1×10 -4 to 0.1; e is from 1×10 -5 to 0.1; and wherein said oxosulfur reducing agent is selected from the group consisting of Bunte compounds having the general formula R'SSO 3 D, where R' is a covalently bonded organic substituent and D is a counterion, and organic and inorganic oxosulfur salts having anions of the general formula S j O k wherein 0.25<j/k<1.0; and wherein said oxosulfur reducing agent is present prior to said firing in a molar ratio of sulfur to alkaline earth metal of greater than 1×10 -4 and less than 0.020.
Claim 15
Dependent Claim
288 words
A storage phosphor comprising the product of firing, at a temperature from about 700° to 1300° C., a composition of matter consisting essentially of oxosulfur reducing agent for iodine, and a combination of species characterized by the relationship: (Ba.sub.1-a-b-c Mg.sub.a Ca.sub.b Sr.sub.c)FX.sub.1-z I.sub.z.rM.sup.a X.sup.a :yA:eQ wherein X is selected from the group consisting of Cl and Br and combinations thereof; M a is selected from the group consisting of Na, K, Rb, and Cs and combinations thereof; X a is selected from the group consisting of F, Cl, Br, and I and combinations thereof; A is selected from the group consisting of Eu, Ce, Sm, and Tb and combinations thereof; Q is selected from the group consisting of BeO, MgO, CaO, SrO, BaO, ZnO, Al 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and ThO 2 and combinations thereof; a+b+c is from 0 to 0.4; z is from 1×10 -4 to 1; r is from 1×10 -6 to 0.1; y is from 1×10 -4 to 0.1; e is from 1×10 -5 to 0.1; and wherein said oxosulfur reducing agent is selected from the group consisting of Bunte compounds having the general formula R'SSO 3 D, where R' is a covalently bonded organic substituent and D is a counterion, and organic and inorganic oxosulfur salts having anions of the general formula S j O k wherein 0.25<j/k<1.0; and wherein said oxosulfur reducing agent is present prior to said firing in a molar ratio of sulfur to alkaline earth metal of greater than 1×10 -4 and less than 0.020.
Claim 16
Dependent Claim
9 words
The phosphor of claim 13 wherein A is Eu.
Claim 17
Dependent Claim
47 words
The phosphor of claim 13 wherein said reducing agent is selected from the group consisting of: salts of SO 3 2- , S 2 O 4 2- , S 2 O 3 2- , S 2 O 5 2- , and S 4 O 6 2- .
Claim 18
Dependent Claim
12 words
The phosphor of claim 13 wherein said oxosulfur reducing agent comprises thiosulfate.
Claim 19
Dependent Claim
301 words
A radiographic image storage panel comprising a support and a fluorescent layer including phosphor crystals capable of absorbing X-radiation and emitting longer wavelength electromagnetic radiation in response to stimulating radiation of a third wavelength, said phosphor crystals consisting essentially of the product of firing, at a temperature from about 700° to 1300° C., a combination of species characterized by the relationship: MFX.sub.1-z I.sub.z.uM.sup.a X.sup.a :yA:eQ:tD wherein M is selected from the group consisting of Mg, Ca, Sr, and Ba and combinations thereof; X is selected from the group consisting of Cl and Br and combinations thereof; M a is selected from the group consisting of Na, K, Rb, and Cs and combinations thereof; X a is selected from the group consisting of F, Cl, Br, and I and combinations thereof; A is selected from the group consisting of Eu, Ce, Sm, and Tb and combinations thereof; Q is selected from the group consisting of BeO, MgO, CaO, SrO, BaO, ZnO, Al 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and ThO 2 and combinations thereof; D is selected from the group consisting of V, Cr, Mn, Fe, Co, and Ni and combinations thereof; z is from 1×10 -4 to 1; u is from 0 to 1; y is from 1×1×10 -4 to 0.1; e is from 0 to 1; and t is from 0 to 1×10 -2 ; and oxosulfur reducing agent for iodine, wherein said oxosulfur reducing agent for iodine is present in said combination of species in an amount sufficient to increase relative photostimulated luminescence intensities relative to the phosphor defined above absent said reducing agent for iodine.
Claim 20
Dependent Claim
301 words
A radiographic image storage panel comprising a support and a fluorescent layer including phosphor crystals capable of absorbing X-radiation and emitting longer wavelength electromagnetic radiation in response to stimulating radiation of a third wavelength, said phosphor crystals consisting essentially of the product of firing, at a temperature from about 700° to 1300° C., a combination of species characterized by the relationship: MFX.sub.1-z I.sub.z.uM.sup.a X.sup.a :yA:eQ:tD wherein M is selected from the group consisting of Mg, Ca, Sr, and Ba and combinations thereof; X is selected from the group consisting of Cl and Br and combinations thereof; M a is selected from the group consisting of Na, K, Rb, and Cs and combinations thereof; X a is selected from the group consisting of F, Cl, Br, and I and combinations thereof; A is selected from the group consisting of Eu, Ce, Sm, and Tb and combinations thereof; Q is selected from the group consisting of BeO, MgO, CaO, SrO, BaO, ZnO, Al 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and ThO 2 and combinations thereof; D is selected from the group consisting of V, Cr, Mn, Fe, Co, and Ni and combinations thereof; z is from 1×10 -4 to 1; u is from 0 to 1; y is from 1×1×10 -4 to 0.1; e is from 0 to 1; and t is from 0 to 1×10 -2 ; and oxosulfur reducing agent for iodine, wherein said oxosulfur reducing agent for iodine is present in said combination of species in an amount sufficient to increase relative photostimulated luminescence intensities relative to the phosphor defined above absent said reducing agent for iodine.
Claim 21
Dependent Claim
223 words
The panel of claim 17 further characterized as consisting essentially of the product of firing a composition of matter consisting essentially of oxosulfur reducing agent for iodine, and a combination of species characterized by the relationship: (Ba.sub.1-a-b-c Mg.sub.a Ca.sub.b Sr.sub.c)FX.sub.1-z I.sub.z.rM.sup.a X.sup.a :yA:eQ wherein X is selected from the group consisting of Cl and Br; M a is selected from the group consisting of Na, K, Rb, and Cs; X a is selected from the group consisting of F, Cl, Br, and I; A is selected from the group consisting of Eu, Ce, Sm, and Tb; Q is selected from the group consisting of BeO, MgO, CaO, SrO, BaO, ZnO, Al 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and ThO 2 ; a+b+c is from 0 to 0.4; z is from 1×10 -4 to 1; r is from 10 -6 to 0.1; y is from 1×10 -4 to 0.1; e is from 10 -5 to 0.1; and wherein said oxosulfur reducing agent for iodine is present prior to said firing in an amount sufficient to increase relative photostimulated luminescence intensities relative to the phosphor defined above absent said oxosulfur reducing agent.
Claim 22
Dependent Claim
35 words
The panel of claim 18 wherein said oxosulfur reducing agent is present prior to said firing, in a molar ratio of sulfur to alkaline earth metal of greater than 1×10 -4 and less than 0.020.
Claim 23
Dependent Claim
57 words
The panel of claim 19 wherein said oxosulfur reducing agent is selected from the group consisting of Bunte compounds having the general formula R'SSO 3 D, where R' is a covalently bonded organic substituent and D is a counterion, and organic and inorganic oxosulfur salts having anions of the general formula S j O k wherein 0.25<j/k<1.0.
Claim 24
Dependent Claim
47 words
The panel of claim 19 wherein said reducing agent is selected from the group consisting of: salts of SO 3 2- , S 2 O 4 2- , S 2 O 3 2- , S 2 O 5 2- , and S 4 O 6 2- .
Claim 25
Independent Claim
318 words
A method for preparing a radiographic storage phosphor comprising dispersing in an aqueous solvent an oxosulfate reducing agent for molecular iodine and a plurality of precursor compounds having the total elemental composition of a phosphor selected from the group consisting of divalent alkaline earth metal fluorohalide phosphors containing iodine which satisfy the relationship: MFX.sub.1-z I.sub.z.uM.sup.a X.sup.a :yA:eQ:tD wherein M is selected from the group consisting of Mg, Ca, Sr, and Ba and combinations thereof; X is selected from the group consisting of Cl and Br and combinations thereof; M a is selected from the group consisting of Na, K, Rb, and Cs and combinations thereof; X a is selected from the group consisting of F, Cl, Br, and I and combinations thereof; A is selected from the group consisting of Eu, Ce, Sm, and Tb and combinations thereof; Q is selected from the group consisting of BeO, MgO, CaO, SrO, BaO, ZnO, Al 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and ThO 2 and combinations thereof; D is selected from the group consisting of V, Cr, Mn, Fe, Co, and Ni and combinations thereof; z is from 1×10 -4 to 1; u is from 0 to 1; y is from 1×10 -4 to 0.1; e is from 0 to 1; and t is from 0 to 1×10 -2 ; wherein said oxosulfur reducing agent for iodine is present with said precursor compounds in a molar ratio of sulfur to alkaline earth metal of greater than 1×10 -4 and less than 0.020; said plurality of precursor compounds yielding said phosphor as a product of firing; drying said dispersion; and firing the product of said drying, said firing being at a temperature from about 700° to 1300° C.
Claim 26
Independent Claim
318 words
A method for preparing a radiographic storage phosphor comprising dispersing in an aqueous solvent an oxosulfate reducing agent for molecular iodine and a plurality of precursor compounds having the total elemental composition of a phosphor selected from the group consisting of divalent alkaline earth metal fluorohalide phosphors containing iodine which satisfy the relationship: MFX.sub.1-z I.sub.z.uM.sup.a X.sup.a :yA:eQ:tD wherein M is selected from the group consisting of Mg, Ca, Sr, and Ba and combinations thereof; X is selected from the group consisting of Cl and Br and combinations thereof; M a is selected from the group consisting of Na, K, Rb, and Cs and combinations thereof; X a is selected from the group consisting of F, Cl, Br, and I and combinations thereof; A is selected from the group consisting of Eu, Ce, Sm, and Tb and combinations thereof; Q is selected from the group consisting of BeO, MgO, CaO, SrO, BaO, ZnO, Al 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and ThO 2 and combinations thereof; D is selected from the group consisting of V, Cr, Mn, Fe, Co, and Ni and combinations thereof; z is from 1×10 -4 to 1; u is from 0 to 1; y is from 1×10 -4 to 0.1; e is from 0 to 1; and t is from 0 to 1×10 -2 ; wherein said oxosulfur reducing agent for iodine is present with said precursor compounds in a molar ratio of sulfur to alkaline earth metal of greater than 1×10 -4 and less than 0.020; said plurality of precursor compounds yielding said phosphor as a product of firing; drying said dispersion; and firing the product of said drying, said firing being at a temperature from about 700° to 1300° C.
Claim 27
Dependent Claim
178 words
The method of claim 22 wherein said precursor compounds satisfy the relationship: (Ba.sub.1-a-b-c Mg.sub.a Ca.sub.b Sr.sub.c)FX.sub.1-z I.sub.z.rM.sup.a X.sup.a :yA:eQ wherein X is selected from the group consisting of Cl and Br and combinations thereof; M a is selected from the group consisting of Na, K, Rb, and Cs and combinations thereof; X a is selected from the group consisting of F, Cl, Br, and I and combinations thereof; A is selected from the group consisting of Eu, Ce, Sm, and Tb and combinations thereof; Q is selected from the group consisting of BeO, MgO, CaO, SrO, BaO, ZnO, Al 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and ThO 2 and combinations thereof; a+b+c is from 0 to 0.4; z is from 1×10 -4 to 1; r is from 1×10 -6 to 0.1; y is from 1×10 -4 to 0.1; e is from 1×10 -5 to 0.1.
Claim 28
Independent Claim
281 words
A method for preparing a stabilized radiographic phosphor intermediate comprising dispersing in an aqueous solvent an oxosulfate reducing agent and a plurality of precursor compounds having the total elemental composition of a phosphor selected from the group consisting of divalent alkaline earth metal fluorohalide phosphors containing iodine which satisfy the relationship: MFX.sub.1-z I.sub.z.uM.sup.a X.sup.a :yA:eQ:tD wherein M is selected from the group consisting of Mg, Ca, Sr, and Ba and combinations thereof; X is selected from the group consisting of Cl and Br and combinations thereof; M a is selected from the group consisting of Na, K, Rb, and Cs and combinations thereof; X a is selected from the group consisting of F, Cl, Br, and I and combinations thereof; A is selected from the group consisting of Eu, Ce, Sm, and Tb and combinations thereof; Q is selected from the group consisting of BeO, MgO, CaO, SrO, BaO, ZnO, Al 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and ThO 2 and combinations thereof; D is selected from the group consisting of V, Cr, Mn, Fe, Co, and Ni and combinations thereof; z is from 1×10 -4 to 1; u is from 0 to 1; y is from 1×10 -4 to 0.1; c is from 0 to 1; and t is from 0 to 1×10 -2 ; wherein said oxosulfur reducing agent for iodine is present with said precursor compounds in a molar ratio of sulfur to alkaline earth metal of greater than 1×10 -4 and less than 0.020.
Claim 29
Independent Claim
281 words
A method for preparing a stabilized radiographic phosphor intermediate comprising dispersing in an aqueous solvent an oxosulfate reducing agent and a plurality of precursor compounds having the total elemental composition of a phosphor selected from the group consisting of divalent alkaline earth metal fluorohalide phosphors containing iodine which satisfy the relationship: MFX.sub.1-z I.sub.z.uM.sup.a X.sup.a :yA:eQ:tD wherein M is selected from the group consisting of Mg, Ca, Sr, and Ba and combinations thereof; X is selected from the group consisting of Cl and Br and combinations thereof; M a is selected from the group consisting of Na, K, Rb, and Cs and combinations thereof; X a is selected from the group consisting of F, Cl, Br, and I and combinations thereof; A is selected from the group consisting of Eu, Ce, Sm, and Tb and combinations thereof; Q is selected from the group consisting of BeO, MgO, CaO, SrO, BaO, ZnO, Al 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and ThO 2 and combinations thereof; D is selected from the group consisting of V, Cr, Mn, Fe, Co, and Ni and combinations thereof; z is from 1×10 -4 to 1; u is from 0 to 1; y is from 1×10 -4 to 0.1; c is from 0 to 1; and t is from 0 to 1×10 -2 ; wherein said oxosulfur reducing agent for iodine is present with said precursor compounds in a molar ratio of sulfur to alkaline earth metal of greater than 1×10 -4 and less than 0.020.
Claim 30
Dependent Claim
13 words
The method of claim 24 further comprising drying said dispersion using microwave radiation.
Claim 31
Dependent Claim
56 words
The method of claim 25 wherein said reducing agent is selected from the group consisting of Bunte compounds having the general formula R'SSO 3 D, where R' is a covalently bonded organic substituent and D is a counterion, and organic and inorganic oxosulfur salts having anions of the general formula S j O k wherein 0.25<j/k<1.0.
Claim 32
Dependent Claim
272 words
A stabilized radiographic phosphor intermediate comprising an oxosulfate reducing agent and a plurality of precursor compounds having the total elemental composition of a phosphor selected from the group consisting of divalent alkaline earth metal fluorohalide phosphors containing iodine which satisfy the relationship: MFX.sub.1-z I.sub.z.uM.sup.a X.sup.a :yA:eQ:tD wherein M is selected from the group consisting of Mg, Ca, Sr, and Ba and combinations thereof; X is selected from the group consisting of Cl and Br and combinations thereof; M a is selected from the group consisting of Na, K, Rb, and Cs and combinations thereof; X a is selected from the group consisting of F, Cl, Br, and I and combinations thereof; A is selected from the group consisting of Eu, Ce, Sm, and Tb and combinations thereof; Q is selected from the group consisting of BeO, MgO, CaO, SrO, BaO, ZnO, Al 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and ThO 2 and combinations thereof; D is selected from the group consisting of V, Cr, Mn, Fe, Co, and Ni and combinations thereof; z is from 1×10 -4 to 1; u is from 0 to 1; y is from 1×10 -4 to 0.1; e is from 0 to 1; and t is from 0 to 1×10 -2 ; wherein said oxosulfur reducing agent for iodine is present with said precursor compounds in a molar ratio of sulfur to alkaline earth metal of greater than 1×10 -4 and less than 0.020.
Claim 33
Dependent Claim
272 words
A stabilized radiographic phosphor intermediate comprising an oxosulfate reducing agent and a plurality of precursor compounds having the total elemental composition of a phosphor selected from the group consisting of divalent alkaline earth metal fluorohalide phosphors containing iodine which satisfy the relationship: MFX.sub.1-z I.sub.z.uM.sup.a X.sup.a :yA:eQ:tD wherein M is selected from the group consisting of Mg, Ca, Sr, and Ba and combinations thereof; X is selected from the group consisting of Cl and Br and combinations thereof; M a is selected from the group consisting of Na, K, Rb, and Cs and combinations thereof; X a is selected from the group consisting of F, Cl, Br, and I and combinations thereof; A is selected from the group consisting of Eu, Ce, Sm, and Tb and combinations thereof; Q is selected from the group consisting of BeO, MgO, CaO, SrO, BaO, ZnO, Al 2 O 3 , La 2 O 3 , In 2 O 3 , SiO 2 , TiO 2 , ZrO 2 , GeO 2 , SnO 2 , Nb 2 O 5 , Ta 2 O 5 , and ThO 2 and combinations thereof; D is selected from the group consisting of V, Cr, Mn, Fe, Co, and Ni and combinations thereof; z is from 1×10 -4 to 1; u is from 0 to 1; y is from 1×10 -4 to 0.1; e is from 0 to 1; and t is from 0 to 1×10 -2 ; wherein said oxosulfur reducing agent for iodine is present with said precursor compounds in a molar ratio of sulfur to alkaline earth metal of greater than 1×10 -4 and less than 0.020.
Claim 34
Dependent Claim
60 words
The stabilized radiographic phosphor intermediate of claim 27 wherein said oxosulfur reducing agent is selected from the group consisting of Bunte compounds having the general formula R'SSO 3 D, where R' is a covalently bonded organic substituent and D is a counterion, and organic and inorganic oxosulfur salts having anions of the general formula S j O k wherein 0.25<j/k<1.0.
Claim 35
Dependent Claim
18 words
The phosphor of claim 1 wherein M is Ba.sub.(1-a) Sr.sub.(a) wherein a is from 5×10 -6 to 0.015.
Claim 36
Dependent Claim
18 words
The method of claim 22 wherein M is Ba.sub.(1-a) Sr.sub.(a) wherein a is from 5×10 -6 to 0.015.
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US4912333A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-16 | 1999-10-16 | 2000-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-16 | 2003-10-16 | 2004-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-16 | 2007-10-16 | 2008-04-16 | $7700.00 | Window Closed / Lapsed |