GB382520A - Improvements relating to electron discharge tubes - Google Patents

Improvements relating to electron discharge tubes

Info

Publication number
GB382520A
GB382520A GB6944/32A GB694432A GB382520A GB 382520 A GB382520 A GB 382520A GB 6944/32 A GB6944/32 A GB 6944/32A GB 694432 A GB694432 A GB 694432A GB 382520 A GB382520 A GB 382520A
Authority
GB
United Kingdom
Prior art keywords
anode
cathode
barium
march
class
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
GB6944/32A
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 GB382520A publication Critical patent/GB382520A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/38—Exhausting, degassing, filling, or cleaning vessels
    • H01J9/385—Exhausting vessels

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Abstract

382,520. Thermionic valves. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, 13D, Emmasingel, Eindhoven, Holland. March 8, 1932, No. 6944. Convention date, March 24, 1931. [Class 39 (i).] Occluded gas is removed from a cathode bv bombardment by means of electrons emitted from a substance applied to another electrode such as the anode or grid. Barium azide may be attached to the inside of the anode which is heated by a high frequency field during evacuation so as to evolve nitrogen and leave barium. A positive potential is applied to the cathode and the anode is heated so that electrons are emitted from the barium. After the cathode has been freed from gas, the anode may be raised to a higher temperature so that barium is deposited on the cathode to form, after oxidation, an electron emitting coating. Specification 245,146, [Class 39 (i), Electric lamps, Arc &c.], is referred to.
GB6944/32A 1931-03-24 1932-03-08 Improvements relating to electron discharge tubes Expired GB382520A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR382520X 1931-03-24

Publications (1)

Publication Number Publication Date
GB382520A true GB382520A (en) 1932-10-27

Family

ID=8895437

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6944/32A Expired GB382520A (en) 1931-03-24 1932-03-08 Improvements relating to electron discharge tubes

Country Status (1)

Country Link
GB (1) GB382520A (en)

Similar Documents

Publication Publication Date Title
US2393803A (en) Method of making long life secondary electron emitters
US2159774A (en) Secondary electron emitter and method of making it
GB302307A (en) Improvements relating to electron discharge apparatus
GB382520A (en) Improvements relating to electron discharge tubes
US2316276A (en) Electron discharge apparatus
US3884539A (en) Method of making a multialkali electron emissive layer
US2228945A (en) Electric discharge tube
GB496556A (en) Improvements in electrodes for electron discharge devices
US2323560A (en) Electron discharge apparatus
US2845567A (en) Indirectly heated thermionic cathode
US1752747A (en) Electron-discharge device and getter therefor
US1722121A (en) Electron-discharge device
GB300403A (en) Improvements relating to thermionic valves or electron discharge tubes
US1731268A (en) Electron-discharge device
US1861637A (en) Production of alkali metal tubes
US1691446A (en) Electron-discharge device with oxide-coated filament
US1895437A (en) Method of degassing cathodes of electron discharge tubes
US2284655A (en) Electric discharge tube
US2372455A (en) Cathode-ray tube
US1993108A (en) Vacuum tube
US1701849A (en) Electric discharge tube
US1830162A (en) Cathode and process of making the same
GB393258A (en) Improvements in the introduction of chemically active substances into vacuum tubes
US1586558A (en) Manufacture of electron-discharge devices
GB214262A (en) Improvements in and relating to electric discharge tubes