GB316104A - Improvements relating to coated cathodes for electron discharge devices - Google Patents

Improvements relating to coated cathodes for electron discharge devices

Info

Publication number
GB316104A
GB316104A GB22507/29A GB2250729A GB316104A GB 316104 A GB316104 A GB 316104A GB 22507/29 A GB22507/29 A GB 22507/29A GB 2250729 A GB2250729 A GB 2250729A GB 316104 A GB316104 A GB 316104A
Authority
GB
United Kingdom
Prior art keywords
carbonates
solvents
cathodes
binder
coated
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
GB22507/29A
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.)
Westinghouse Lamp Co
Original Assignee
Westinghouse Lamp Co
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 Westinghouse Lamp Co filed Critical Westinghouse Lamp Co
Publication of GB316104A publication Critical patent/GB316104A/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
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H01J9/042—Manufacture, activation of the emissive part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
    • B65H35/0006—Article or web delivery apparatus incorporating cutting or line-perforating devices
    • B65H35/006—Article or web delivery apparatus incorporating cutting or line-perforating devices with means for delivering a predetermined length of tape

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)
  • Paints Or Removers (AREA)
  • Discharge Lamp (AREA)

Abstract

316,104. Westinghouse Lamp Co., (Assignees of Fredenburgh, M. N.). July 20, 1928, [Convention date]. Vacuum tubes.-In the manufacture of oxide coated cathodes in which a filament is coated with alkaline earth carbonates mixed with or protected by a binder, such as a solution of cellulose nitrate, deterioration on ageing is prevented by the use of pure carbonates, prepared as described in Specifications 315,324 and 315,801, together with solvents for the binder which are completely vaporizable in vacuo and do not react with the carbonates to produce compounds deleterious to emission, or if reactive with the carbonates, produce compounds which are totally dissociated by the heat employed in the seasoning of the cathodes. As solvents, diethyl carbonate and diethyl oxalate are employed, either alone or in mixture; proportions and directions are given for the preparation of the coating material. To the solvents mentioned, anhydrous alcohols of lower boiling points may be added. Specification 315,800 also is referred to.
GB22507/29A 1928-07-20 1929-07-22 Improvements relating to coated cathodes for electron discharge devices Expired GB316104A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US294326A US1842161A (en) 1928-07-20 1928-07-20 Electron emission material

Publications (1)

Publication Number Publication Date
GB316104A true GB316104A (en) 1930-09-25

Family

ID=23132929

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22507/29A Expired GB316104A (en) 1928-07-20 1929-07-22 Improvements relating to coated cathodes for electron discharge devices

Country Status (6)

Country Link
US (1) US1842161A (en)
BE (1) BE362221A (en)
DE (1) DE521050C (en)
FR (1) FR678731A (en)
GB (1) GB316104A (en)
NL (1) NL28930C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE745742C (en) * 1937-03-09 1944-03-31 Elek Zitaets Ag Process for the manufacture of oxide cathodes

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2600112A (en) * 1948-06-30 1952-06-10 Sylvania Electric Prod Electron emitter
US2673387A (en) * 1951-05-18 1954-03-30 Gen Electric Electron emission coating mixtures
US2985548A (en) * 1957-12-26 1961-05-23 Sylvania Electric Prod Method of making a low density coating for an electron discharge device
US4411827A (en) * 1981-03-18 1983-10-25 Corneille David M Coprecipitation process for thermionic cathode type materials
US4359489A (en) * 1981-03-18 1982-11-16 Corneille David M Coprecipitation process for thermionic cathode type materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE745742C (en) * 1937-03-09 1944-03-31 Elek Zitaets Ag Process for the manufacture of oxide cathodes

Also Published As

Publication number Publication date
BE362221A (en)
US1842161A (en) 1932-01-19
NL28930C (en)
DE521050C (en) 1931-03-16
FR678731A (en) 1930-04-03

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