GB798945A - Improvements in or relating to electric discharge devices - Google Patents

Improvements in or relating to electric discharge devices

Info

Publication number
GB798945A
GB798945A GB35096/54A GB3509654A GB798945A GB 798945 A GB798945 A GB 798945A GB 35096/54 A GB35096/54 A GB 35096/54A GB 3509654 A GB3509654 A GB 3509654A GB 798945 A GB798945 A GB 798945A
Authority
GB
United Kingdom
Prior art keywords
filament
mandrel
wire
flattened
tungsten
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
GB35096/54A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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
Priority to NL96915D priority Critical patent/NL96915C/xx
Priority to NL202520D priority patent/NL202520A/xx
Priority to DENDAT1070740D priority patent/DE1070740B/de
Application filed by General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB35096/54A priority patent/GB798945A/en
Priority to US576510A priority patent/US2881104A/en
Publication of GB798945A publication Critical patent/GB798945A/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
    • 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
    • H01J9/08—Manufacture of heaters for indirectly-heated cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
    • H01K3/02—Manufacture of incandescent bodies

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Lasers (AREA)

Abstract

798,945. Making filaments for electron discharge tubes; destructible cores. GENERAL ELECTRIC CO., Ltd., JONES, D. J., and GOSSLING, B. S. Nov. 28, 1955 [Dec. 3, 1954], No. 35096/54. Classes 83 (2) and 83 (4). [Also in Group XL (a)] A filament of refractory metal, such as silica tungsten wire, of substantially flattened zig-zag shape for use in an electric discharge device, is made by winding the wire upon a ductile metal mandrel, pressing the mandrel and wire so as to flatten it to the required shape and chemically removing the ductile metal. The flattened filament is then heat treated to set it. The silica tungsten wire is preferably first wound on a tungsten wire mandrel and is then removed and placed on a mandrel of annealed copper wire. After flattening, which may take place at a temperature between 200 ‹C. and 400 C., the copper is removed by dissolving in nitric acid. The flattened filament is then heat treated in a hydrogen atmosphere at 1400‹ C. for ten minutes. The mandrel or the spiral may be heated before or during the pressing so as to remove residual stresses. The tungsten filament is preferably for use as a cathode in an X-ray tube. The flattened filament is disposed within a groove formed in a machined nickel cathode head, with the filament disposed parallel to the face of the head opposite a copper anode. An example is given of the dimensions of a particular filament.
GB35096/54A 1954-12-03 1954-12-03 Improvements in or relating to electric discharge devices Expired GB798945A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL96915D NL96915C (en) 1954-12-03
NL202520D NL202520A (en) 1954-12-03
DENDAT1070740D DE1070740B (en) 1954-12-03
GB35096/54A GB798945A (en) 1954-12-03 1954-12-03 Improvements in or relating to electric discharge devices
US576510A US2881104A (en) 1954-12-03 1955-12-05 Methods of producing refractory metal filaments of flattened zig-zag form

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB35096/54A GB798945A (en) 1954-12-03 1954-12-03 Improvements in or relating to electric discharge devices

Publications (1)

Publication Number Publication Date
GB798945A true GB798945A (en) 1958-07-30

Family

ID=10373771

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35096/54A Expired GB798945A (en) 1954-12-03 1954-12-03 Improvements in or relating to electric discharge devices

Country Status (4)

Country Link
US (1) US2881104A (en)
DE (1) DE1070740B (en)
GB (1) GB798945A (en)
NL (2) NL202520A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT222751B (en) * 1960-06-17 1962-08-10 Egyesuelt Izzolampa Process for the production of incandescent lamp filaments
US3530010A (en) * 1968-07-22 1970-09-22 Research Corp Method of making blazed optical diffraction gratings
HU207907B (en) * 1987-10-22 1993-06-28 Tungsram Reszvenytarsasag Apparatus for continuous heat treating tungsten spiral filaments on molibdenum core

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2165310A (en) * 1939-07-11 Filament
US1738960A (en) * 1926-03-30 1929-12-10 Mutscheller Arthur Vacuum discharge device and method of using the same
US2069081A (en) * 1932-05-31 1937-01-26 Gen Electric Electric incandescent lamp
US2047555A (en) * 1933-05-31 1936-07-14 Parsons & Co Ltd C A Manufacture of hollow turbine blades
US2482826A (en) * 1945-08-04 1949-09-27 Tung Sol Lamp Works Inc Filament structure for thermionic tubes

Also Published As

Publication number Publication date
NL202520A (en)
NL96915C (en)
DE1070740B (en)
US2881104A (en) 1959-04-07

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