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US 4,479,521 AGranted
Phosphor manufacturing process
AssigneeGTE Products Corporation
InventorsHarvey C. Lubold, Jr., Glenn H. Roberts
Life of this patent
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Abstract
In the manufacture of an alkaline earth halophosphate phosphor, a tray is filled from an automatic loader with a predetermined weight of powder comprising a blend of raw ingredients for forming said phosphor. The filled tray is then vibrated with a pattern inserted therein to settle the powder into a powder mass having a shape that promotes uniformity of reaction when the powder is fired at a temperature that causes the raw ingredients to react and form said phosphor.
Claims3
In the manufacture of an alkaline earth halophosphate phosphor, the steps which comprise:
- conveying an empty tray to a position under the discharge chute of an automatic loader, said loader having a hopper containing a powder blend of raw ingredients to form said phosphor;
- automatically discharging a predetermined weight of said powder from said hopper through said chute into said tray;
- conveying the tray of powder to an automatic vibrator;
- and vibrating said tray of powder with a pattern inserted therein to cause the powder to settle into a powder mass having a thickness throughout that tends to promote uniformity of reaction when the powder mass is fired at a temperature that causes the raw ingredients to react and form said phosphor.
1 more element
Dependencies are inferred from the claim text.