Electric discharge lamp

Coating processes – Electrical product produced – Hollow article

Patent

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Details

313221, 313222, 427107, H01K 132

Patent

active

039845907

ABSTRACT:
Electric discharge lamps of extended life can be produced or cheaper materials used in their manufacture by providing on the internal surface of the envelope and on the exposed surfaces of internal components a protective coating of a metal phosphate or arsenate glass. External surfaces can also be protected against corrosion in air or in the atmosphere within an outer jacket, where this is employed. The coating may be applied in a liquid medium which, preferably after draining, is warmed to evaporate the medium and thereafter baked to form the vitreous coating.

REFERENCES:
patent: 2843504 (1958-07-01), Bakel et al.
patent: 3023337 (1962-02-01), Repsher

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