SE339794

1,231,517. Glass compositions; glass to metal seals. GENERAL ELECTRIC CO. 21 Feb., 1969 [23 Feb., 1968], No. 9576/69. Heading C1M. [Also in Division G2] Glass used to make photoflash lamp bulbs comprises essentially by weight, 60-75% SiO 2 , 10-25% B 2 O 3 , 1-10% Al 2 O 3 , 4-10% total alkali oxide...

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Bibliographische Detailangaben
Hauptverfasser:	WEBER K, CRESSMAN G
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY GLASS HEATING JOINING GLASS TO GLASS OR OTHER MATERIALS LIGHT SOURCES NOT OTHERWISE PROVIDED FOR LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATINGELEMENTS LIGHTING MECHANICAL ENGINEERING METALLURGY MINERAL OR SLAG WOOL NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS WEAPONS
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Beschreibung
Zusammenfassung:	1,231,517. Glass compositions; glass to metal seals. GENERAL ELECTRIC CO. 21 Feb., 1969 [23 Feb., 1968], No. 9576/69. Heading C1M. [Also in Division G2] Glass used to make photoflash lamp bulbs comprises essentially by weight, 60-75% SiO 2 , 10-25% B 2 O 3 , 1-10% Al 2 O 3 , 4-10% total alkali oxides and 0-5% BaO, and has a coefficient of linear thermal expansion of 40 x 10-7 to 50 x 10-7 per ‹C. in the temperature range 0-300‹ C. The alkali oxides are preferably selected from sodium, potassium and lithium oxides. Residual fluxes, impurities and refining agents such as As 2 O 3 may be present. Lead in wires of iron-cobalt-nickel alloys of similar coefficients of linear thermal expansion are sealed to the lamp by a bead of the same glass.