H - Electricity – 01 – J
Patent
H - Electricity
01
J
117/114, 313/136
H01J 61/35 (2006.01) H01J 17/04 (2006.01)
Patent
CA 1050605
ABSTRACT OF THE DISCLOSURE 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. 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.
190140
Cayless Maurice A.
Cole Susan M.
Mason David R.
Wharmby David O.
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