Coating for halogen lamps

Details Coating for halogen lamps Coating for halogen lamps

1981-10-19

1983-07-05

Hoffman, James R.

Coating processes

Electrical product produced

Hollow article

106 74, 106 84, 427165, 427169, C03C 1723, H01K 132

Patent

active

043918476

ABSTRACT:
The invention relates to a composition for an opaque coating for minimizing the light output from selected areas of an incandescent lamp, particularly a halogen lamp. It has been discovered that a paste comprising a mixture of sodium silicate and manganese dioxide, when thinned with water to a desired consistency, then applied to the external surface of a halogen lamp bulb and properly dried, forms a tightly adhering, opaque coating of dark gray color which resists flaking and blistering at operational temperatures of the halogen lamp.

REFERENCES:
patent: 3320460 (1967-05-01), Bouchard et al.
patent: 3552992 (1971-01-01), Self et al.
patent: 3784861 (1974-01-01), Notelteirs et al.

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