GB484975A - Improvements in or relating to electric lamps - Google Patents

Improvements in or relating to electric lamps

Info

Publication number
GB484975A
GB484975A GB31641/37A GB3164137A GB484975A GB 484975 A GB484975 A GB 484975A GB 31641/37 A GB31641/37 A GB 31641/37A GB 3164137 A GB3164137 A GB 3164137A GB 484975 A GB484975 A GB 484975A
Authority
GB
United Kingdom
Prior art keywords
relating
electric lamps
tragacanth
sintered
rods
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
GB31641/37A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB484975A publication Critical patent/GB484975A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/96—Lamps with light-emitting discharge path and separately-heated incandescent body within a common envelope, e.g. for simulating daylight

Landscapes

  • Compositions Of Oxide Ceramics (AREA)
  • Resistance Heating (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

A composition for electric resistances having a negative temperature coefficient consists of ferrosilicon containing about 98 per cent of silicon, aluminium silicate and tragacanth, formed into rods and sintered.
GB31641/37A 1936-11-20 1937-11-17 Improvements in or relating to electric lamps Expired GB484975A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE484975X 1936-11-20

Publications (1)

Publication Number Publication Date
GB484975A true GB484975A (en) 1938-05-12

Family

ID=6543216

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31641/37A Expired GB484975A (en) 1936-11-20 1937-11-17 Improvements in or relating to electric lamps

Country Status (4)

Country Link
US (1) US2200951A (en)
BE (1) BE424693A (en)
FR (1) FR829567A (en)
GB (1) GB484975A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2723366A (en) * 1950-11-13 1955-11-08 Gen Electric Starting and operating circuit for high pressure gaseous discharge device
GB1054423A (en) * 1963-04-22
US4987342A (en) * 1989-03-27 1991-01-22 Gte Products Corporation Self-ballasted glow discharge lamp having indirectly-heated cathode

Also Published As

Publication number Publication date
BE424693A (en)
US2200951A (en) 1940-05-14
FR829567A (en) 1938-06-30

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