FR2174469A5 - Tungsten filament mfr - using a copper alloy coated steel mandrel - Google Patents

Tungsten filament mfr - using a copper alloy coated steel mandrel

Info

Publication number
FR2174469A5
FR2174469A5 FR7210374A FR7210374A FR2174469A5 FR 2174469 A5 FR2174469 A5 FR 2174469A5 FR 7210374 A FR7210374 A FR 7210374A FR 7210374 A FR7210374 A FR 7210374A FR 2174469 A5 FR2174469 A5 FR 2174469A5
Authority
FR
France
Prior art keywords
copper alloy
alloy coated
mfr
coated steel
tungsten filament
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
FR7210374A
Other languages
French (fr)
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.)
Duro Test Corp
Original Assignee
Duro Test Corp
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
Priority claimed from US00223607A external-priority patent/US3812393A/en
Application filed by Duro Test Corp filed Critical Duro Test Corp
Application granted granted Critical
Publication of FR2174469A5 publication Critical patent/FR2174469A5/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)
  • Wire Processing (AREA)

Abstract

Tungsten wire is helically wound onto a mandrel made of a low melting steel alloy coated with copper or a copper alloy, annealed at a temp. high enough to melt the coating so that it flows over the filament. The wire is then cut to length and the mandrel etched away in nitric or sulphuric acid. Method prevents the introduction of undesirable impurities esp O2 and Fe into the W, forming weak areas.
FR7210374A 1972-02-04 1972-03-24 Tungsten filament mfr - using a copper alloy coated steel mandrel Expired FR2174469A5 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00223607A US3812393A (en) 1970-08-24 1972-02-04 Reduced impurity filament for electric lamps

Publications (1)

Publication Number Publication Date
FR2174469A5 true FR2174469A5 (en) 1973-10-12

Family

ID=22837238

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7210374A Expired FR2174469A5 (en) 1972-02-04 1972-03-24 Tungsten filament mfr - using a copper alloy coated steel mandrel

Country Status (3)

Country Link
CA (1) CA974568A (en)
FR (1) FR2174469A5 (en)
NL (1) NL175566C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005059950A2 (en) * 2003-12-16 2005-06-30 Koninklijke Philips Electronics N.V. Electric incandescent lamp and method for fabrication thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5066783A (en) * 1986-05-20 1991-11-19 Cohen Eric A Antiviral peptides and means for treating herpes infections

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005059950A2 (en) * 2003-12-16 2005-06-30 Koninklijke Philips Electronics N.V. Electric incandescent lamp and method for fabrication thereof
WO2005059950A3 (en) * 2003-12-16 2007-06-14 Koninkl Philips Electronics Nv Electric incandescent lamp and method for fabrication thereof

Also Published As

Publication number Publication date
CA974568A (en) 1975-09-16
NL7203305A (en) 1973-08-07
NL175566C (en) 1984-11-16
NL175566B (en) 1984-06-18

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Legal Events

Date Code Title Description
ST Notification of lapse