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US 4,393,118 AGranted
Method of preparing a dark body phosphor
AssigneeGTE Products Corporation
InventorsHarry L. Marshall, Alan R. Schwartz
Life of this patent
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Abstract
A pigmented phosphor is prepared by coating phosphor particles with a coating of finely powdered carbon and colloidal silica.
Claims8
A method of making pigmented phosphor comprising the steps of:
- preparing an aqueous suspension of phosphor particles and finely powdered carbon;
- adding colloidal silica to the suspension;
- agitating the suspension;
- removing the liquid and drying the phosphor particles.
1 more element
A pigmented phosphor comprising a core of a phosphor particle having a black coating thereon wherein the black coating is finely powdered carbon.
Dependencies are inferred from the claim text.