GB311294A - Improvements in and relating to electric discharge devices - Google Patents

Improvements in and relating to electric discharge devices

Info

Publication number
GB311294A
GB311294A GB14412/29A GB1441229A GB311294A GB 311294 A GB311294 A GB 311294A GB 14412/29 A GB14412/29 A GB 14412/29A GB 1441229 A GB1441229 A GB 1441229A GB 311294 A GB311294 A GB 311294A
Authority
GB
United Kingdom
Prior art keywords
envelope
oxide
metallic
substances
electric 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
GB14412/29A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB311294A publication Critical patent/GB311294A/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

Abstract

311,294. Spanner, H. J., and D÷ring, U. May 8, 1928, [Convention date]. Vacuum tubes; low-pressure metallic-vapour apparatus.-An electric discharge device is provided with an envelope permeable by ultra-violet rays and contains a filling of one or more rare gases, with or without mercury or other metallic vapour, and one or more self-heating cathodes coated with emissive substances the Richardson constant of which is less than three, such emissive substances having no action on the envelope of the device. Preferably, the electrodes are provided with a coating of highly active metals, e.g., barium, strontium or caesium, combined with amphoteric substances, such as aluminium oxide, zirconium oxide, or nickel oxide. The active substance may be incorporated in the body of the electrode either in the metallic form or as a compound and gradually diffuses to the surface. To start the discharge, the cathode is initially heated by an adjacent auxiliary electrode, the heating being continued by the discharge current itself. Specification 272,440 is referred to. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the use of thorium oxide as an amphoteric substance. For lighting purposes, the envelope may contain various gases and be made of coloured or fluorescent glass. This subject-matter does not appear in the Specification as accepted.
GB14412/29A 1928-05-08 1929-05-08 Improvements in and relating to electric discharge devices Expired GB311294A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE311294X 1928-05-08

Publications (1)

Publication Number Publication Date
GB311294A true GB311294A (en) 1930-08-08

Family

ID=6128933

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14412/29A Expired GB311294A (en) 1928-05-08 1929-05-08 Improvements in and relating to electric discharge devices

Country Status (1)

Country Link
GB (1) GB311294A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE974888C (en) * 1952-03-24 1961-05-25 Philips Nv Process for the manufacture of a cathode for electrical discharge tubes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE974888C (en) * 1952-03-24 1961-05-25 Philips Nv Process for the manufacture of a cathode for electrical discharge tubes

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