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Patent No. 1,623,301 for Foval Heat-Resistant Glass - Page 3 Home  > Insulators  > Patents  > Page 3

1,623,301: 3 of 3

1,623,301
3. Method of manufacturing a heat-resisting glass of the boro-silicate type, which consists in producing in the melt a colloidal suspension of certain ingredients of the glass, and arresting the heating operation so as to preserve said colloidal condition in the product. 4. Method of manufacturing a heat-resisting glass of the boro-silicate type, which consists in melting a batch containing silica, a boron compound, an alkali metal alumina, and a fluorine compound to produce a colloidal solution, and arresting the heating operation so as to preserve the colloidal condition in the product. 5. Method of manufacturing a heat-resisting glass of the boro-silicate type, which consists in melting a batch containing silica, a boron compound, an alkali metal alumina and a fluorine compound, and arresting the heating operation while the melt is still turbid to produce a translucent glass. 6. Method of manufacturing a heat-resisting glass of the boro-silicate type, which consists in melting a batch containing silica, boric acid, an alkali metal, alumina and cryolite, and stopping the application of heat while the melt is still turbid to produce a translucent glass.	7. Method of manufacturing a heat-resisting glass of the boro-silicate type, which consists in melting a batch containing silica, a boron compound, an alkali metal, alumina, an oxide of the second group of the periodic system, and a fluorine compound to produce a colloidal solution, and arresting the heating operation so as to preserve the colloidal condition in the product. 8. Method of manufacturing a heat-resisting glass of the boro-silicate type, which consists in melting a batch containing silica, a boron compound, an alkali metal, alumina, an oxide of the second group of the periodic system, and a fluorine compound, and arresting the heating operation while the melt is still turbid to produce a translucent glass. 9. Method of manufacturing a heat-resisting glass of the boro-silicate type, which consists in melting a batch containing silica, boric acid, an alkali metal, an oxide of the second group of the periodic system, alumina and cryolite, and stopping the operation of heat while the melt is still turbid to produce a translucent glass. RALPH F. BRENNER