GB1220104A - Process for removing alkali contamination from electric lamps - Google Patents

Process for removing alkali contamination from electric lamps

Info

Publication number
GB1220104A
GB1220104A GB07366/68A GB1736668A GB1220104A GB 1220104 A GB1220104 A GB 1220104A GB 07366/68 A GB07366/68 A GB 07366/68A GB 1736668 A GB1736668 A GB 1736668A GB 1220104 A GB1220104 A GB 1220104A
Authority
GB
United Kingdom
Prior art keywords
lamp
impurities
envelope
filament
april
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB07366/68A
Inventor
John F Waymouth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Publication of GB1220104A publication Critical patent/GB1220104A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
    • H01K3/22—Exhausting, degassing, filling, or cleaning vessels

Abstract

1,220,104. Electric incandescent lamp. SYLVANIA ELECTRIC PRODUCTS Inc. 10 April, 1968 [20 April, 1967], No. 17366/68. Heading H1F. Trace amounts of alkali metal impurities are removed from a lamp by applying a negative D.C. potential (with respect to the filament) to a part of the lamp envelope from which the impurities will not escape into the fill gas during normal operation of the lamp, heating the lamp to at least 500‹ C. and attracting the impurities to the said part of the envelope. A metal clip 4 is disposed about part of the exhaust tube 2 of a lamp which has been outgassed, flushed and filled with halogen and inert gas. The clip 4 is attached to the negative terminal of D.C. supply 6 whilst one of the lead-in wires 7 is connected to the other supply terminal. When the filament 9 is energized trace quantities of Na, Li and K in the silica envelope 3 and the tungsten filament 9 or lead-in wires 7 are ionized and attracted into the exhaust tube. The process is continued until spectrometric analysis of the gas content of the lamp does not detect any alkali metal. The lamp is subsequently tipped off.
GB07366/68A 1967-04-20 1968-04-10 Process for removing alkali contamination from electric lamps Expired GB1220104A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US63234567A 1967-04-20 1967-04-20

Publications (1)

Publication Number Publication Date
GB1220104A true GB1220104A (en) 1971-01-20

Family

ID=24535149

Family Applications (1)

Application Number Title Priority Date Filing Date
GB07366/68A Expired GB1220104A (en) 1967-04-20 1968-04-10 Process for removing alkali contamination from electric lamps

Country Status (2)

Country Link
US (1) US3425767A (en)
GB (1) GB1220104A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030233847A1 (en) * 2002-06-19 2003-12-25 Fridrich Elmer G. Manufacture of elongated fused quartz member

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3005674A (en) * 1953-12-22 1961-10-24 Westinghouse Electric Corp Method of dosing mercury vapor lamps

Also Published As

Publication number Publication date
US3425767A (en) 1969-02-04

Similar Documents

Publication Publication Date Title
US3514660A (en) Electric discharge flicker lamp
GB1419099A (en) Manufacturing electric devices having sealed envelopes
ES348270A1 (en) Electric lamp and method of manufacture
GB1149022A (en) High-pressure electric discharge lamps
GB1145415A (en) Incandescent lamp
US2279907A (en) Electric discharge lamp
US2664517A (en) Tipless quartz lamp
GB986514A (en) Improvements in the manufacture of electric incandescent lamps
GB1220104A (en) Process for removing alkali contamination from electric lamps
US2290208A (en) Process for the manufacture of gaseous discharge lamps
GB1286048A (en) Lamp
US2042261A (en) Gaseous electric discharge device
GB1423981A (en) Discharge lamp
GB1147140A (en) Incandescent lamp
US2482509A (en) Incandescent electricl lamp for series service
GB1195109A (en) Tungsten Incandescent Lamps.
GB1137439A (en) Projection lamp
US2640945A (en) Introduction of active materials into evacuated envelopes
GB1051170A (en)
GB1041461A (en) Improvements in or relating to metallic-vapour discharge lamps
GB983465A (en) A microminiature electric incandescent lamp
GB1167665A (en) Electric Lamp
GB498827A (en) Improvements relating to electric incandescent lamps
GB1209866A (en) Improvements in or relating to electric lamps
GB1419098A (en) Gettering