FR771488A - Electric discharge tubes - Google Patents

Electric discharge tubes

Info

Publication number: FR771488A
Authority: FR; France
Prior art keywords: electric discharge; discharge tubes; tubes; electric; discharge
Prior art date: 1933-04-21
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

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.)

1933-04-21

Filing date

1934-04-09

Publication date

1934-10-09

1934-04-09 Application filed by Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV

1934-10-09 Application granted granted Critical

1934-10-09 Publication of FR771488A publication Critical patent/FR771488A/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
- H01J61/74—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

FR771488D 1933-04-21 1934-04-09 Electric discharge tubes Expired FR771488A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
NL411412X		1933-04-21

Publications (1)

Publication Number	Publication Date
FR771488A true FR771488A (en)	1934-10-09

Family

ID=19785984

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR771488D Expired FR771488A (en)	1933-04-21	1934-04-09	Electric discharge tubes

Country Status (3)

Country	Link
US (1)	US1984502A (en)
FR (1)	FR771488A (en)
GB (1)	GB411412A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3501662A (en) *	1967-12-29	1970-03-17	Westinghouse Electric Corp	Planar or three-dimensional fluorescent lamp and method of manufacture

1934
- 1934-03-14 GB GB8077/34A patent/GB411412A/en not_active Expired
- 1934-04-09 FR FR771488D patent/FR771488A/en not_active Expired
- 1934-04-17 US US721057A patent/US1984502A/en not_active Expired - Lifetime

Also Published As

Publication number	Publication date
US1984502A (en)	1934-12-18
GB411412A (en)	1934-06-07

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