GB437326A - Improvements in electric discharge tubes - Google Patents

Improvements in electric discharge tubes

Info

Publication number
GB437326A
GB437326A GB773/35A GB77335A GB437326A GB 437326 A GB437326 A GB 437326A GB 773/35 A GB773/35 A GB 773/35A GB 77335 A GB77335 A GB 77335A GB 437326 A GB437326 A GB 437326A
Authority
GB
United Kingdom
Prior art keywords
cap
glass
proportions
electric discharge
asbestos
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
GB773/35A
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 GB437326A publication Critical patent/GB437326A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/10—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass
    • B24B9/102—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass for travelling sheets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
    • H01J5/54—Means forming part of the tube or lamps for the purpose of providing electrical connection to it supported by a separate part, e.g. base

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

An electric discharge tube producing a high temperature in the region of its contactmaking cap has the cap formed of a dispersion of glass in porous, heat-proof, insulating material such as asbestos-cement, gypsum or brick chamotte. The percentage of glass may be 20-55. Asbestos powder, Portland cement, talc and borate glass may be mixed together in the proportions 30, 80, 70 and 15 and the mixture moistened, cold-moulded to form the cap, dried and sintered at 1000 DEG C. To avoid the risk of moisture being taken up by the cap at its cool part near the electric contacts, the cap so formed is soaked in an alcoholic solution or aqueous dispersion of phenolformaldehyde condensation product and slowly heated to 180 DEG C. and cooled. The borate glass contains SiO2, B2O3, Al2O3, Na2O and CaO in the proportions 9, 50, 15, 16 and 10 and may be replaced by other low melting-point glass.
GB773/35A 1934-03-05 1935-01-09 Improvements in electric discharge tubes Expired GB437326A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL437326X 1934-03-05

Publications (1)

Publication Number Publication Date
GB437326A true GB437326A (en) 1935-10-28

Family

ID=19786210

Family Applications (1)

Application Number Title Priority Date Filing Date
GB773/35A Expired GB437326A (en) 1934-03-05 1935-01-09 Improvements in electric discharge tubes

Country Status (4)

Country Link
BE (1) BE407959A (en)
FR (1) FR785842A (en)
GB (1) GB437326A (en)
NL (1) NL39999C (en)

Also Published As

Publication number Publication date
BE407959A (en)
FR785842A (en) 1935-08-20
NL39999C (en)

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