GB1193741A - Improvements in or relating to Tungsten Wire - Google Patents

Improvements in or relating to Tungsten Wire

Info

Publication number
GB1193741A
GB1193741A GB680368A GB680368A GB1193741A GB 1193741 A GB1193741 A GB 1193741A GB 680368 A GB680368 A GB 680368A GB 680368 A GB680368 A GB 680368A GB 1193741 A GB1193741 A GB 1193741A
Authority
GB
United Kingdom
Prior art keywords
tungsten
lamp
wire
stranded
feb
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
GB680368A
Inventor
Cyril John Law
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.)
LAMP METALS Ltd
Original Assignee
LAMP METALS Ltd
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 LAMP METALS Ltd filed Critical LAMP METALS Ltd
Priority to GB680368A priority Critical patent/GB1193741A/en
Publication of GB1193741A publication Critical patent/GB1193741A/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
    • H01K3/02—Manufacture of incandescent bodies
    • 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
    • H01K1/08—Metallic bodies

Landscapes

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

Abstract

1,193,741. Lamp filaments. LAMP METALS Ltd. 12 Feb., 1969 [12 Feb., 1968], No. 6803/68. Heading H1F. [Also in Division D1] Stranded tungsten wire for use as the filament of an incandescent electric lamp and having a cross-sectional area equivalent to a single wire of diameter of at least 0À25 mm is composed of at least three constituent wires stranded together each having a diameter less than 0À25 mm and of a type designed to develop a long grain structure on heating above the recrystallization temperature of tungsten. Preferably all the constituent wires have the same diameter. Grain growth promoting additives such as potassium silicate and alumina are added to the tungsten. The lamp filaments may be straight lengths of stranded wire, or single or double coils; and are subjected to stress relieving or coil setting heat treatment before being cut to the required lengths.
GB680368A 1968-02-12 1968-02-12 Improvements in or relating to Tungsten Wire Expired GB1193741A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB680368A GB1193741A (en) 1968-02-12 1968-02-12 Improvements in or relating to Tungsten Wire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB680368A GB1193741A (en) 1968-02-12 1968-02-12 Improvements in or relating to Tungsten Wire

Publications (1)

Publication Number Publication Date
GB1193741A true GB1193741A (en) 1970-06-03

Family

ID=9821057

Family Applications (1)

Application Number Title Priority Date Filing Date
GB680368A Expired GB1193741A (en) 1968-02-12 1968-02-12 Improvements in or relating to Tungsten Wire

Country Status (1)

Country Link
GB (1) GB1193741A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007006281A2 (en) * 2005-07-10 2007-01-18 Ip2H Ag Light source, filament and method for producing a monocrystalline metal wire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007006281A2 (en) * 2005-07-10 2007-01-18 Ip2H Ag Light source, filament and method for producing a monocrystalline metal wire
WO2007006281A3 (en) * 2005-07-10 2007-06-21 Ip2H Ag Light source, filament and method for producing a monocrystalline metal wire

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee