Glasses Technology

Glasses Patent Description
BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The invention relates to lead-free bismuth-containing silicate glasses. The invention also relates to uses of these glasses. (more…)

United States Patent Application 20010046934
Kind Code A1
Naumann, Karin ; et al. November 29, 2001
Glasses Patent Abstract
The lead-free bismuth-containing silicate glasses, which are particularly suitable for use as funnel glass or neck glass for cathode ray tubes and as soldering glass, have the following respective compositions (in % by weight, based on oxide): SiO.sub.2 40-60; Bi.sub.2O.sub.3, 10-30; ZrO.sub.2, 0-3; Al.sub.2O.sub.3, 0.5-5; MgO, 0-6; CaO, 0.5-5; SrO, 1-15; BaO, 0-15; sum of the alkaline earth metal oxides, 2-20; ZnO, 0-2; Li.sub.2O, 0-10; Na.sub.2O, 1-10; K.sub.2O, 2-10; Cs.sub.2O, 0-3, sum of the alkali metal oxides, 5-20; CeO.sub.2, 0-8; WO.sub.3, 0.5-5; MoO.sub.3, 0-5 and Sb.sub.2O.sub.3, 0-0.6; and SiO.sub.2 30-50; Bi.sub.2O.sub.3, 20-40; ZrO.sub.2, 0-3; Al.sub.2O.sub.3, 0.5-5; MgO, 0-4; CaO, 0.5-4; SrO, 1-15; BaO, 0-15; sum of the alkaline earth metal oxides, 2-20; ZnO, 0-2; Li.sub.2O, 0-5; Na.sub.2O, 1-12; K.sub.2O, 2-15; Cs.sub.2O, 0-3, sum of the alkali metal oxides, 5-20; CeO.sub.2, 0-8; WO.sub.3, 0.5-5; MoO.sub.3, 0-5 and Sb.sub.2O.sub.3, 0-0.6. (more…)

Glasses Patent Description
This invention relates to inorganic oxide glass compositions. Our copending British Patent Application No. 48105/71 discloses certain borophosphate glasses, that is, glasses having a network structure comprising a random mixture of boric and phosphoric oxides. The glass disclosed in that application also comprise minor proportions of the oxides of one or more alkali metals, alkaline earth metals, and/or zinc and have compositions within the following range (mole %)
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Glasses Patent Abstract
Inorganic oxide glasses having compositions within the range (in moles percent) B.sub.2 O.sub.3 1.2-3.5, P.sub.2 O.sub.5 50-72, PbO 0-30, transition metal oxides 0-5, the remainder being oxides selected from alkali metal oxides, alkaline earths and zinc oxide.
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