FR776973A - Improvements to incandescent electric lamps - Google Patents

Improvements to incandescent electric lamps

Info

Publication number: FR776973A
Authority: FR; France
Prior art keywords: electric lamps; incandescent electric; incandescent; lamps; electric
Prior art date: 1933-10-27
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

Inventor

Joseph Gerard Van Den Francois

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.)

1933-10-27

Filing date

1933-10-27

Publication date

1935-02-08

1933-10-27 Application filed filed Critical

1935-02-08 Application granted granted Critical

1935-02-08 Publication of FR776973A publication Critical patent/FR776973A/en

Status Expired legal-status Critical Current

Classifications

- 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
- H01J61/76—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a filling of permanent gas or gases only

FR776973D 1933-10-27 1933-10-27 Improvements to incandescent electric lamps Expired FR776973A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
FR776973T		1933-10-27

Publications (1)

Publication Number	Publication Date
FR776973A true FR776973A (en)	1935-02-08

Family

ID=9201328

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR776973D Expired FR776973A (en)	1933-10-27	1933-10-27	Improvements to incandescent electric lamps

Country Status (1)

Country	Link
FR (1)	FR776973A (en)

1933
- 1933-10-27 FR FR776973D patent/FR776973A/en not_active Expired

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