US3676358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Atomizing, spray-drying and flame process for manufacturing phosphors
Assignee: GTE Sylvania Inc
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Filing: 1970-01-02
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Granted: 1972-07-11
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Expires: 1990-01-02
Abstract
Abstract Phosphor raw ingredients are homogeneously dispersed or dissolved in a liquid which is then spray dried to form particles having a predetermined particle size range, each particle containing substantially identical proportions of the raw materials. The particles are then passed through a flame in order to react the particles to form phosphor matrices.
Inventors
- 👤 Ernest A Dale
- 👤 Martha J B Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:05
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/70; C09K11/71; C09K11/72; C09K11/73
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
16 words
The process of claim 1 wherein said particles are at least partially melted in said flame.
Claim 2
Dependent Claim
15 words
The process of claim 1 wherein said flame results from burning of a gaseous fuel.
Claim 3
Dependent Claim
25 words
The process of claim 3 including the step of at least partially mixing said particles with said gaseous fuel before said particles enter said flame.
Claim 4
Dependent Claim
26 words
The process of claim 4 including the step of introducing a combustion supporting gas to the mixture of particles and fuel by means of rotating nozzles.
Claim 5
Dependent Claim
29 words
The process of claim 1 including the step of introducing a volatile reactive species into said flame, said species reacting with said particles therein to form said phosphor matrix.
Claim 6
Dependent Claim
59 words
The process of manufacturing a halophosphate or orthophosphate phosphor comprising the steps of preparing a powder having a predetermined particle size range, said powder comprising phosphor-forming ingredients including calcium and/or strontium and/or barium compounds plus a phosphate-containing compound, and firing said powder in a flame jet sufficiently to react said ingredients to form a halophosphate or orthophosphate phosphor matrix.
Claim 7
Dependent Claim
16 words
The process of claim 7 wherein said powder is at least partially melted in said flame.
Claim 8
Dependent Claim
74 words
The process of manufacturing a halophosphate phosphor comprising the steps of: preparing a solution and/or dispersion including phosphoric acid, a nitrate of calcium and/or strontium and/or barium, a halide and an activating ingredient; atomizing said solution and/or dispersion into droplets and drying said droplets to produce particles having a predetermined particle size range; transporting said particles into a flame and heating said particles therein to a temperature sufficient to form a halophosphate phosphor matrix.
Claim 9
Dependent Claim
18 words
The process of claim 9 including the step of activating said phosphor matrix by a subsequent firing thereof.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |