GB920904A - Improvements in or relating to electric lamps incorporating a sealed quartz envelope - Google Patents

Improvements in or relating to electric lamps incorporating a sealed quartz envelope

Info

Publication number
GB920904A
GB920904A GB3034360A GB3034360A GB920904A GB 920904 A GB920904 A GB 920904A GB 3034360 A GB3034360 A GB 3034360A GB 3034360 A GB3034360 A GB 3034360A GB 920904 A GB920904 A GB 920904A
Authority
GB
United Kingdom
Prior art keywords
envelope
hours
period
sealing
quartz
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
GB3034360A
Inventor
Kenneth William Dodd
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
Application filed by General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB3034360A priority Critical patent/GB920904A/en
Publication of GB920904A publication Critical patent/GB920904A/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
    • H01J9/39—Degassing vessels

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Resistance Heating (AREA)

Abstract

920,904. Heat treatment of quartz envelopes. GENERAL ELECTRIC CO. Ltd. Sept. 4, 1961 [Sept. 2, 1960], No. 30343/60. Class 56. In the manufacture of an electric lamp having a sealed quartz envelope containing electrical energy consuming means, the prefabricated quartz shell is heated, prior to the final evacuation or gas filling and sealing of the envelope, at a temperature of at least 1000‹ C. for a period of not less than 30 minutes in a vacuum or inert gas, the shell being kept out of contact with moisture during the period between such heating and the final sealing of the envelope. The period and temperature relation is shown on a curve passing through the points 8¢ hours at 1000‹ C., 4“ hours at 1100‹ C., 1¥ hours at 1200‹ C. and ¢ hour at 1300‹ C. Preferably, argon is used for the heating step and the final evacuation or gas filling and sealing are carried out immediately after the heating step.
GB3034360A 1960-09-02 1960-09-02 Improvements in or relating to electric lamps incorporating a sealed quartz envelope Expired GB920904A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3034360A GB920904A (en) 1960-09-02 1960-09-02 Improvements in or relating to electric lamps incorporating a sealed quartz envelope

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3034360A GB920904A (en) 1960-09-02 1960-09-02 Improvements in or relating to electric lamps incorporating a sealed quartz envelope

Publications (1)

Publication Number Publication Date
GB920904A true GB920904A (en) 1963-03-13

Family

ID=10306130

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3034360A Expired GB920904A (en) 1960-09-02 1960-09-02 Improvements in or relating to electric lamps incorporating a sealed quartz envelope

Country Status (1)

Country Link
GB (1) GB920904A (en)

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