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Schott Ag

Schott Glas

Ottmar Becker

Franz Ott

Karin Naumann

Friedrich Siebers

Christian Kunert

Inka Henze

Richard C Marlor

Waldemar Weinberg

Gerhard Hahn

Petra Auchter-Krummel

Veit Luther

Richard Marlor

An alkaline-earth aluminosilicate glass having a composition (in % by weight, based on oxide) of SiO&#x3e;55-64; AlO13-18; BO0-5.5; MO 0-7; CaO 5.5-14; SrO 0-8; BaO 6-17; ZrO0-2; CeO0-0.3; TiO0-0.5; CoO 0.01-0.035; FeO0.005-0.05; and NiO 0-0.03 is suitable for use in lamp bulbs

Alkaline-earth aluminosilicate glass, containing CA and BA, suitable for use in lamp bulbs, and a lamp bulb containing same

A long life, halogen cycle, incandescent lamp ( ) for operation in excess of 85 volts. The lamp comprises a transparent glass envelope ( ) having sealed therewithin a tungsten filament ( ); a pair of electrical lead-ins ( ) connecting the filament and extending exteriorly of the envelope for connection to a supply voltage greater than 100 V; and a fill gas within the envelope, including a halogen, at a pressure of at least three atmospheres. The envelope is constructed of a five component alkaline earth aluminosilicate glass having a composition consisting essentially of, in weight percent from >58 to about 64% SiO , from about 14 to about 17% Al O ; from 0 to about 1% B O , from 1 to about 6% MgO, from about 6 to about 12% CaO, from about 7 to about 17% BaO and from 0 to about 1.5% ZrO .

Long life halogen cycle incandescent lamp and glass envelope composition

The lead- and cadmium-free glass composition for glazing, enameling and decorating glass or glass-ceramic articles contains high quartz and/or keatite solid solution crystals as principal crystalline phases after crystallization and a low thermal expansion coefficient of less than 2.times.10.sup.-6 /K at temperatures between 20 and 700.degree. C. This glass composition contains Li.sub.2 O, 0 to 5% by weight; Na.sub.2 O, 0 to 5% by weight; K.sub.2 O, less than 2% by weight; MgO, 0 to 3% by weight; CaO, 0 to 4% by weight; SrO, 0 to 4% by weight; BaO, 0 to 4% by weight; ZnO, 0 to 4% by weight; B.sub.2 O.sub.3, 15 to 27% by weight; Al.sub.2 O.sub.3, 10 to 20% by weight; SiO.sub.2, 43 to 58% by weight; TiO.sub.2, 0 to 3% by weight and ZrO.sub.2, 0 to 4% by weight, Sb.sub.2 O.sub.3, 0 to 2% by weight; F, 0 to 3% by weight in exchange for oxygen and up to 30% by weight of at least one inorganic pigment resistant to a burning-in temperature on the glass or the glass-ceramics. The sum total amount of Li.sub.2 O, Na.sub.2 O and K.sub.2 O must be from 1 to 10% by weight. An average bending tensile strength of a glass-ceramic or glass article completely coated with the glass composition after burning-in is greater than 30 MPa.

Lead-free and cadmium-free glass compositions for glazing, enameling and

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Langen, Germany

Ottmar Becker