FR669389A - Electric discharge tubes - Google Patents

Electric discharge tubes

Info

Publication number: FR669389A
Authority: FR; France
Prior art keywords: electric discharge; discharge tubes; tubes; electric; discharge
Prior art date: 1928-03-30
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.)

1928-03-30

Filing date

1929-02-08

Publication date

1929-11-15

1929-02-08 Application filed by Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV

1929-11-15 Application granted granted Critical

1929-11-15 Publication of FR669389A publication Critical patent/FR669389A/en

Status Expired legal-status Critical Current

Classifications

- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/15—Cathodes heated directly by an electric current
- H01J1/18—Supports; Vibration-damping arrangements

FR669389D 1928-03-30 1929-02-08 Electric discharge tubes Expired FR669389A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
NL1897255X		1928-03-30

Publications (1)

Publication Number	Publication Date
FR669389A true FR669389A (en)	1929-11-15

Family

ID=19873254

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
FR669389D Expired FR669389A (en)	1928-03-30	1929-02-08	Electric discharge tubes

Country Status (3)

Country	Link
US (1)	US1897255A (en)
FR (1)	FR669389A (en)
NL (1)	NL23841C (en)

0
- NL NL23841D patent/NL23841C/xx active
1929
- 1929-02-08 FR FR669389D patent/FR669389A/en not_active Expired
- 1929-03-16 US US347505A patent/US1897255A/en not_active Expired - Lifetime

Also Published As

Publication number	Publication date
NL23841C (en)
US1897255A (en)	1933-02-14

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