Electrostatic silica coating for electric lamps

Electric lamp and discharge devices – With optical device or special ray transmissive envelope – Light diffusing

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H01K 132

Patent

active

044410476

ABSTRACT:
A silica powder mixture is disclosed for electrostatic deposition to provide diffuse light from electric lamps. The present powder mixture exhibits improved moisture resistance along with shelf life and comprises in weight proportions approximately 35-65 parts calcined diatomaceous silica, approximately 35-65 parts fumed silica, and approximately 5-15 parts colloidal hydrophobic silica.

REFERENCES:
patent: 4081709 (1978-03-01), Collins et al.
patent: 4099080 (1978-07-01), Dawson et al.

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