US3923682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing phosphors
Assignee: GTE Sylvania Inc
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Filing: 1969-12-29
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Granted: 1975-12-02
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Expires: 1989-12-29
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 fluidizing bed within a heated chamber, the chamber being maintained at a temperature high enough to react the particles to form phosphor matrices.
Inventors
- 👤 Ernest A Dale
- 👤 Leonard V Dullea
- 👤 Martha J B Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:01
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/70; C09K11/72; C09K11/73
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
THE PROCESS OF MANUFACTURING AN ANTIMONY ACTIVATED CALCIUM HALOPHOSPHATE PHOSPHOR COMPRISING THE STEPS OF: A. PREPARING A SOLUTION CONTAINING CALCIUM NITRATE, ANTIMONY CHLORIDE, HYDROFLUORIC ACID, CADMIUM NITRATE AND PHOSPHORIC ACID, B. ATOMIZING SAID SOLUTION INTO DROPLETS, C. DRYING SAID DROPLETS TO PRODUCE PARTICLES HAVING A PREDETEMINED PARTICLE SIZE RANGE, D. TRANSPORTING SAID PARTICLES INTO A HEATED FLUIDIZING BED COMPRISING AN INERT GRANULAR MATERIAL WHICH IS IN CONSTANT MOTION DURING OPERATION, AND E. HEATING SAID PARTICLES THEREIN TO A TEMPERATURE SUFFICIENT TO FORM A PHOSPHOR MATRIX.
Claim 2
Dependent Claim
85 words
THE PROCESS OF MANUFACTURING AN ANTIMONY ACTIVATED CALCIUM HALOPHOSPHATE PHOSPHOR COMPRISING THE STEPS OF: A. PREPARING A SOLUTION CONTAINING CALCIUM NITRATE, ANTIMONY CHLORIDE, HYDROFLUORIC ACID, CADMIUM NITRATE AND PHOSPHORIC ACID, B. ATOMIZING SAID SOLUTION INTO DROPLETS, C. DRYING SAID DROPLETS TO PRODUCE PARTICLES HAVING A PREDETEMINED PARTICLE SIZE RANGE, D. TRANSPORTING SAID PARTICLES INTO A HEATED FLUIDIZING BED COMPRISING AN INERT GRANULAR MATERIAL WHICH IS IN CONSTANT MOTION DURING OPERATION, AND E. HEATING SAID PARTICLES THEREIN TO A TEMPERATURE SUFFICIENT TO FORM A PHOSPHOR MATRIX.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein said particles are pneumatically transported to said fluidizing bed and wherein said bed is fluidized by a separate gas.
Claim 4
Dependent Claim
32 words
The process of claim 2 wherein said fluidizing bed comprises an inert heat-resistant granular material having a particle size greater than that of said particles being reacted to form said phosphor matrix.
Claim 5
Dependent Claim
29 words
The process of claim 3 including the additional steps of carrying the reacted particles upward from said fluidizing bed by gaseous flow and separating the particles from the gases.
Claim 6
Dependent Claim
27 words
The process of claim 3 wherein said particles are introduced into said fluidizing bed at a point where the motion of said granular material is substantially downward.
References Cited (Backward Citations)
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US3030313A
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US3378335A
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US3305349A
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US3538014A
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US3541019A
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US3586635A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |