GB822553A - Electric low-pressure discharge tubes, more particularly fluorescent lamps - Google Patents

Electric low-pressure discharge tubes, more particularly fluorescent lamps

Info

Publication number
GB822553A
GB822553A GB4797/56A GB479756A GB822553A GB 822553 A GB822553 A GB 822553A GB 4797/56 A GB4797/56 A GB 4797/56A GB 479756 A GB479756 A GB 479756A GB 822553 A GB822553 A GB 822553A
Authority
GB
United Kingdom
Prior art keywords
tartrate
barium
earth metal
alkaline earth
pressure discharge
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
GB4797/56A
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of GB822553A publication Critical patent/GB822553A/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
    • H01J61/0675—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode
    • H01J61/0677—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material

Landscapes

  • Discharge Lamp (AREA)

Abstract

822,553. Cathode materials. PATENTTREUHAND-GESELLSCHAFT FœR ELEKTRISCHE GLUHLAMPEN. Feb. 15, 1956 [Feb. 23, 1955], No. 4797/56. Class 39(1). A gas-filled low pressure discharge tube such as a fluorescent lamp has electrodes which have an emissive coating of alkaline earth metal oxides containing also about 0À05-1À5% of one or more of those alkali metals whose work function is greater and whose ion radius is smaller than the corresponding values for the alkaline earth metal responsible for the emission. With barium-containing emissive material, potassium, sodium, or lithium may be used. One method of preparation is by precipitating alkaline earth metal tartrate from the soluble nitrate with sodium potassium tartrate. The tartrate is then converted into the carbonate by heating in oxygen. This method produces a very firm incorporation of the small alkali addition. Another suitable method is to add alkali carbonates to the barium-strontium tartrates precipitated by treating soluble barium-strontium compounds with ammonium tartrate. Specifications 740,478 and 787,059 are referred to.
GB4797/56A 1955-02-23 1956-02-15 Electric low-pressure discharge tubes, more particularly fluorescent lamps Expired GB822553A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP13621A DE1005636B (en) 1955-02-23 1955-02-23 Electric low-pressure discharge tubes, in particular fluorescent lamps

Publications (1)

Publication Number Publication Date
GB822553A true GB822553A (en) 1959-10-28

Family

ID=7364719

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4797/56A Expired GB822553A (en) 1955-02-23 1956-02-15 Electric low-pressure discharge tubes, more particularly fluorescent lamps

Country Status (5)

Country Link
US (1) US2831137A (en)
BE (1) BE545445A (en)
DE (1) DE1005636B (en)
FR (1) FR1141719A (en)
GB (1) GB822553A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2963450A (en) * 1958-03-17 1960-12-06 Interlectric Corp Filament coating composition
ITMI20012389A1 (en) * 2001-11-12 2003-05-12 Getters Spa CABLE CATHODE WITH INTEGRATED GETTER FOR DISCHARGE LAMPS AND METHODS FOR ITS REALIZATION

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL24414C (en) * 1926-06-09
US2201167A (en) * 1937-03-09 1940-05-21 Germeshausen Kenneth Joseph Gaseous-discharge device
BE482916A (en) * 1947-06-05
US2714681A (en) * 1948-08-27 1955-08-02 Gen Electric Electric discharge device
US2677623A (en) * 1949-10-27 1954-05-04 Ets Claude Paz & Silva Process for manufacturing electron emissive material and electrodes

Also Published As

Publication number Publication date
US2831137A (en) 1958-04-15
BE545445A (en)
FR1141719A (en) 1957-09-06
DE1005636B (en) 1957-04-04

Similar Documents

Publication Publication Date Title
GB648955A (en) Improvements in electron-emitting electrodes for electric discharge tubes
ES206484A1 (en) Cathode containing a supply of an electron-emissive material
GB782287A (en) Improvements in or relating to electron emissive coatings
GB1193864A (en) Improvements relating to Low-Pressure Mercury-Vapour Discharge Lamps
US2840751A (en) Electrode coating composition and electrode for cold cathode gas discharge lamp
GB822553A (en) Electric low-pressure discharge tubes, more particularly fluorescent lamps
GB740456A (en) Activating material for electrodes in electric discharge devices
GB496556A (en) Improvements in electrodes for electron discharge devices
US3461335A (en) Glow-discharge tubes containing a radio-active primer
GB804697A (en) Improvements in x-ray tubes
GB715284A (en) Improvements in cathodes and method of making them
GB352756A (en) Improvements in and relating to gaseous electric discharge devices
GB707512A (en) Improvements in or relating to methods of making articles from refractory metals by cutting operations and to articles made by means of these methods
GB701871A (en) Improvements in or relating to cathodes for electric discharge tubes and methods of producing such cathodes
FR2058653A5 (en) Cathode material for ion propulsion - motor
US1972647A (en) Electric glow discharge tube
GB824902A (en) Improvements in cathodes and emissive material therefor
GB460177A (en) Improvements in the activation of the cathodes of electric discharge devices
GB806032A (en) A process for the production of a hot cathode for thermionic tubes
GB637385A (en) Improved process of manufacturing cathodes for electric discharge tubes
GB740478A (en) Improvements in or relating to the manufacture of directly heated thermionic cathodes
JPS5721046A (en) Manufacture of electrode for discharge lamp
GB707241A (en) Improvements in the manufacture of electron-emissive electrodes for electric discharge tubes
GB729819A (en) Improvements in or relating to emissive cathodes
GB410994A (en) Improvements in luminous electric discharge lamps