Patent US4024298A successfully refreshed from Google Patents.
US4024298A
Expired / Lapsed
US
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Method of providing storage dielectric of phosphor particles coated with secondary emissive material
Assignee: Tektronix Inc
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Filing: 1976-04-19
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Granted: 1977-05-17
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Expires: 1996-04-19
Abstract
Abstract An improved method for manufacturing a charge image storage dielectric capable of bistable storage is described. The storage dielectric is made by coating phosphor particles with a secondary emissive-forming substance, and then heating the coated particles to form secondary emissive material and simultaneously bond it to the surface of the phosphor particles.
Inventors
- 👤 Ralph Allen Mossman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:58
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/225; H01J29/18; H01J9/00; H01J9/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
A method of manufacture of a charge image storage dielectric capable of bistable storage of a charge image formed thereon, comprising the steps of: coating a plurality of particles of phosphor material with a secondary emissive-forming substance; and heating the coated phosphor particles to form a secondary electron emissive material from said substance and to bond said secondary emissive material to the outer surface of said phosphor particles whereby a storage dielectric is formed with said secondary emissive material being substantially uniformly distributed throughout said storage dielectric.
Claim 2
Independent Claim
87 words
A method of manufacture of a charge image storage dielectric capable of bistable storage of a charge image formed thereon, comprising the steps of: coating a plurality of particles of phosphor material with a secondary emissive-forming substance; and heating the coated phosphor particles to form a secondary electron emissive material from said substance and to bond said secondary emissive material to the outer surface of said phosphor particles whereby a storage dielectric is formed with said secondary emissive material being substantially uniformly distributed throughout said storage dielectric.
Claim 3
Dependent Claim
51 words
A method in accordance with claim 1 in which the coating step includes dissolving the secondary emissive-forming substance in water, mixing the phosphor particles with the resulting solution to provide a slurry, and drying the slurry to remove the water and leave a coating of said substance on said phosphor particles.
Claim 4
Dependent Claim
76 words
A method in accordance with claim 1 in which the coating step includes dissolving a first substance in water, mixing the phosphor particles with the resulting solution to form a slurry, mixing a second substance with the slurry which reacts with said first substance to produce the secondary emissive-forming substance, and causes said secondary emissive-forming substance to precipitate onto the phosphor particles to form a coating, and filtering the slurry to remove the coated phosphor particles.
Claim 5
Dependent Claim
45 words
A method in accordance with claim 1 in which the phosphor material is manganese activated zinc orthosilicate and the secondary electron emissive material is magnesium oxide formed by coating the phosphor particles with a magnesium compound and heating the coated particles in a oxygen-containing atmosphere.
Claim 6
Dependent Claim
18 words
A method in accordance with claim 4 in which the heating temperature is less than about 900° C.
Claim 7
Dependent Claim
41 words
A method in accordance with claim 1 in which the storage dielectric is applied to a support member after the phosphor particles are coated with secondary emissive material to produce a storage target capable of bistable storage of a charge image.
Claim 8
Dependent Claim
17 words
A method in accordance with claim 6, wherein said storage dielectric is applied as a continuous layer.
Claim 9
Dependent Claim
17 words
A method in accordance with claim 6, wherein said storage dielectric is applied as a patterned layer.
References Cited (Backward Citations)
US2169046A
Cited
US3982150A
Cited
US3264133A
Cited
US3544354A
Cited
US3862450A
Cited
US3540908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |