Through the use of a high temperature aluminosilicate glass comprising by weight percent between 59 and 70 SiO 10 to 20 A1 and 7.4 to 28 BaO, it was found that an effective seal between the lead wires and envelope could be made directly, that is to say, without. Most tungsten-halogen lamp seals are therefore formed between extremely thin foil or foliated sections of refractory metals. Heretofore, lead wires for tungsten halogen lamps could not be directly sealed to the envelope because the coefficient of expansion of a quartz or fused silica envelope, which could withstand the required bulb wall temperatures of the tungsten-halogen cycle, was significantly less than that of a refractory metal lead wire. H01K3/00- Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof.C03C3/085- Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal.C03C3/083- Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound.C03C3/076- Glass compositions containing silica with 40% to 90% silica, by weight.C03C3/04- Glass compositions containing silica.
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#Tungsten rounded free pdf#
Google Patents Rounded end halogen lamp with spiral exhaust tube and method of manufacutreĭownload PDF Info Publication number US3798491A US3798491A US00315772A US3798491DA US3798491A US 3798491 A US3798491 A US 3798491A US 00315772 A US00315772 A US 00315772A US 3798491D A US3798491D A US 3798491DA US 3798491 A US3798491 A US 3798491A Authority US United States Prior art keywords lamp exhaust tube spiral lead wires rounded Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
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Google Patents US3798491A - Rounded end halogen lamp with spiral exhaust tube and method of manufacutre US3798491A - Rounded end halogen lamp with spiral exhaust tube and method of manufacutre