GB549992A - Improvements in or relating to incandescent cathodes for use in gas or vapour filled discharge tubes - Google Patents

Improvements in or relating to incandescent cathodes for use in gas or vapour filled discharge tubes

Info

Publication number
GB549992A
GB549992A GB7201/41A GB720141A GB549992A GB 549992 A GB549992 A GB 549992A GB 7201/41 A GB7201/41 A GB 7201/41A GB 720141 A GB720141 A GB 720141A GB 549992 A GB549992 A GB 549992A
Authority
GB
United Kingdom
Prior art keywords
relating
gas
discharge tubes
filled discharge
vapour filled
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
GB7201/41A
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.)
Filing date
Publication date
Application filed by Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB549992A publication Critical patent/GB549992A/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
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode

Landscapes

  • Discharge Lamp (AREA)
  • Solid Thermionic Cathode (AREA)
  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
  • Lasers (AREA)

Abstract

549,992. Thermionic valves. PHILIPS LAMPS, Ltd. (Naamlooze Vennootschap Philips' Gloeilampenfabrieken). June 6, 1941, No. 7201. Drawings to Specification. [Class 39 (i)] The subject-matter of this Specification is identical with that of Specification 601,200, [Group XL (a)]. Specification 427,609 also is referred to.
GB7201/41A 1940-03-27 1941-06-06 Improvements in or relating to incandescent cathodes for use in gas or vapour filled discharge tubes Expired GB549992A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL222055X 1940-03-27

Publications (1)

Publication Number Publication Date
GB549992A true GB549992A (en) 1942-12-17

Family

ID=19779413

Family Applications (2)

Application Number Title Priority Date Filing Date
GB7201/41A Expired GB549992A (en) 1940-03-27 1941-06-06 Improvements in or relating to incandescent cathodes for use in gas or vapour filled discharge tubes
GB22917/46A Expired GB601200A (en) 1940-03-27 1946-08-01 Improvements in or relating to incandescent cathode for use in gas or vapour filled discharged tubes

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB22917/46A Expired GB601200A (en) 1940-03-27 1946-08-01 Improvements in or relating to incandescent cathode for use in gas or vapour filled discharged tubes

Country Status (7)

Country Link
US (1) US2319338A (en)
BE (1) BE440990A (en)
CH (1) CH222055A (en)
DE (1) DE1079214B (en)
FR (1) FR871060A (en)
GB (2) GB549992A (en)
NL (1) NL58861C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2276681A1 (en) * 1974-06-28 1976-01-23 Thomson Csf GRID FOR ELECTRONIC TUBE AND TUBE WITH SUCH GRID
US4598226A (en) * 1984-12-17 1986-07-01 Clegg John E Concave conical foil-filament lamp
US4585971A (en) * 1984-12-18 1986-04-29 Clegg John E Flat circular foil-filament lamp
DE3517060A1 (en) * 1985-05-11 1986-11-13 Trützschler GmbH & Co KG, 4050 Mönchengladbach DEVICE ON A CARD WITH A RIBBON INSERT

Also Published As

Publication number Publication date
FR871060A (en) 1942-04-07
US2319338A (en) 1943-05-18
NL58861C (en)
BE440990A (en)
CH222055A (en) 1942-06-30
GB601200A (en) 1948-04-29
DE1079214B (en) 1960-04-07

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