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US 4,081,709 AGranted
Electrostatic coating of silica powders on incandescent bulbs
AssigneeGeneral Electric Company
InventorsClifford B. Collins, William G. James
Life of this patent
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Abstract
An improved electrostatically deposited coating is obtained by controlling the particle size and resistivity of the silica powder.
Claims12
An electric lamp comprising a bulb having a light-diffusing coating on the inside thereof comprising an electrostatically deposited powder comprising light refractive particles having a particle size of 1 to 4 microns and a resistivity of 10.sup.8 to 10.sup.11 ohm-centimeters.
A powder for electrostatically coating an electric lamp comprising light refractive particles having:
- a particle size of from 1 to 4 microns, and
- a resistivity of 10.sup.8 to 10.sup.11 ohm-centimeters.
Dependencies are inferred from the claim text.