Coating processes – Electrical product produced – Hollow article
Patent
1975-04-03
1976-09-21
Kendall, Ralph S.
Coating processes
Electrical product produced
Hollow article
427107, 427111, 313221, H01K 132
Patent
active
039820467
ABSTRACT:
Tungsten-halogen lamps of extended life are obtained by coating internal surfaces of the discharge tube and exposed surfaces of internal components with metal phosphate or arsenate glasses. The preferred glass is aluminium titanium phosphate. The coatings may be formed by applying a liquid composition capable of generating the desired phosphate or arsenate to the surfaces to be coated, and subsequently heating them to remove the liquid medium and form a vitreous coating. The medium may be water or an organic solvent such as an alcohol, and may contain a dissolved compound of the metal and an oxyacid of phosphorus or arsenic.
REFERENCES:
patent: 2039773 (1936-05-01), Braselton
patent: 2069713 (1937-02-01), Braselton
patent: 2843504 (1958-07-01), Bakel et al.
patent: 3902091 (1975-08-01), Mason et al.
Coaton James Richard
Cole Susan Margaret
Mason David Robert
Rees John Michael
Buffalow Edith R.
Kendall Ralph S.
O'Connell Robert F.
Thorn Lighting Limited
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