GB917787A - Improvements in or relating to electric incandescent filament lamps - Google Patents

Improvements in or relating to electric incandescent filament lamps

Info

Publication number
GB917787A
GB917787A GB4081760A GB4081760A GB917787A GB 917787 A GB917787 A GB 917787A GB 4081760 A GB4081760 A GB 4081760A GB 4081760 A GB4081760 A GB 4081760A GB 917787 A GB917787 A GB 917787A
Authority
GB
United Kingdom
Prior art keywords
envelope
filament
sealed
relating
pinch
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
GB4081760A
Inventor
Brian Edward Clapson
Geofrey William Warren
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB4081760A priority Critical patent/GB917787A/en
Publication of GB917787A publication Critical patent/GB917787A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/02—Incandescent bodies
    • H01K1/04—Incandescent bodies characterised by the material thereof
    • H01K1/10—Bodies of metal or carbon combined with other substance
    • 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
    • H01K3/06—Attaching of incandescent bodies to mount

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Resistance Heating (AREA)

Abstract

A filament of tantalum carbide may be formed in situ in an electric lamp by welding the ends of a length of tantalum wire to short lengths of thicker tantalum wire and welding these to tungsten wires sealed into a pinch. The pinch is then sealed into a lamp envelope, the envelope evacuated and the filament heated by the passage of current to drive off residual gas from the filament and envelope interior. The envelope is then filled with pure methane and sealed off. The filament is carbonized by heating for six hours at 2000 DEG -2400 DEG C. by the passage of current. The mixture of hydrogen and methane remaining in the envelope serves to prevent decarbonization.
GB4081760A 1960-11-28 1960-11-28 Improvements in or relating to electric incandescent filament lamps Expired GB917787A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4081760A GB917787A (en) 1960-11-28 1960-11-28 Improvements in or relating to electric incandescent filament lamps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4081760A GB917787A (en) 1960-11-28 1960-11-28 Improvements in or relating to electric incandescent filament lamps

Publications (1)

Publication Number Publication Date
GB917787A true GB917787A (en) 1963-02-06

Family

ID=10416777

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4081760A Expired GB917787A (en) 1960-11-28 1960-11-28 Improvements in or relating to electric incandescent filament lamps

Country Status (1)

Country Link
GB (1) GB917787A (en)

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