FR537546A - Improvements to electric lamps - Google Patents

Improvements to electric lamps

Info

Publication number
FR537546A
FR537546A FR537546DA FR537546A FR 537546 A FR537546 A FR 537546A FR 537546D A FR537546D A FR 537546DA FR 537546 A FR537546 A FR 537546A
Authority
FR
France
Prior art keywords
electric lamps
lamps
electric
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
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Application granted granted Critical
Publication of FR537546A publication Critical patent/FR537546A/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/74—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of difficult vaporisable metal vapour, e.g. sodium
FR537546D 1920-01-26 1921-01-25 Improvements to electric lamps Expired FR537546A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US354195A US1531966A (en) 1920-01-26 1920-01-26 Electrical glow device
GB31340/20A GB175032A (en) 1920-01-26 1920-11-05 Improvements in and relating to electric luminous devices

Publications (1)

Publication Number Publication Date
FR537546A true FR537546A (en) 1922-05-24

Family

ID=26260856

Family Applications (1)

Application Number Title Priority Date Filing Date
FR537546D Expired FR537546A (en) 1920-01-26 1921-01-25 Improvements to electric lamps

Country Status (5)

Country Link
US (1) US1531966A (en)
DE (1) DE399244C (en)
FR (1) FR537546A (en)
GB (1) GB175032A (en)
NL (1) NL9605C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2617068A (en) * 1948-12-15 1952-11-04 Fkg Fritz Kesselring Geratebau Vacuum-tight glass-metal joint for vessels containing cesium vapor

Also Published As

Publication number Publication date
GB175032A (en) 1922-02-06
US1531966A (en) 1925-03-31
NL9605C (en) 1923-09-15
DE399244C (en) 1924-07-21

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