A method for manufacturing a crystallized glass member having a curved shape includes a deforming step of deforming at least a portion of a glass plate into a curved shape by an external force that acts on the glass plate while maintaining the temperature of the glass plate within a first temperature range and precipitating crystals from the glass plate. In the method for manufacturing a crystallized glass member having a curved shape according to Claim 1, the first temperature range is from [At40] C. to [At+40] C., wherein At ( C.) is a yield point of the glass plate.

A method for manufacturing a crystallized glass member having a curved shape includes a deforming step of deforming at least a portion of a glass plate into a curved shape by an external force that acts on the glass plate while maintaining the temperature of the glass plate within a first temperature range and precipitating crystals from the glass plate. In the method for manufacturing a crystallized glass member having a curved shape according to Claim 1, the first temperature range is from [At40] C. to [At+40] C., wherein At ( C.) is a yield point of the glass plate.

An alkali-free glass, includes, as represented by mol % based on oxides: 50% to 76% of SiO.sub.2; 2% to 6% of Al.sub.2O.sub.3; 18% to 35% of B.sub.2O.sub.3; 1% to 3.5% of MgO; 0.5% to 4% of CaO; 1% to 4.5% of SrO; and 0% to 3% of BaO, in which an expression (A) is [MgO]+[CaO]+[SrO]+[BaO], and a value of the expression (A) is 3.5 to 6, an expression (B) is [Al.sub.2O.sub.3]([MgO]+[CaO]+[SrO]+[BaO]), and a value of the expression (B) is 2 to 2, an expression (J) is ([MgO]+[CaO])/([MgO]+[CaO]+[SrO]+[BaO]), and a value of the expression (J) is 0.2 to 0.7, and -OH is 0 mm.sup.1 to 0.1 mm.sup.1.

Control apparatus for the formation of a tube (referred to as clad) and subsequent injection of material into the tube (referred to as core) to create a unified product (referred to as preform) while in a microgravity environment. The apparatus permits control of a plurality of key variables during the manufacturing process including heating, cooling, and holding temperature in various parts of the instrument, keeping a precise rotation schedule, maintaining a dry atmosphere, managing any chemical effluent, and ensuring all surfaces are unreactive.

A soda-lime-silica glass that has a composition comprising 60-80 wt % SiO.sub.2; 8-18 wt % Na.sub.2O; 5-15 wt % CaO; 0-3 wt % Al.sub.2O.sub.3; 0.0010-0.050 wt % silver expressed as Ag.sub.2O; and 0.005-0.30 wt % bismuth expressed as Bi.sub.2O.sub.3 is disclosed. Light-scattering silver colloids are dispersed throughout the soda-lime-silica glass to provide the glass with a yellow coloration. The soda-lime-silica glass may be in the form of a body that provides a shape of a container that defines an internal containment space. The body of such a container includes a base, a mouth that defines an opening to the internal containment space, and a wall that externs from the base to the mouth. A method of making a glass container that exhibits a yellow coloration is also disclosed.

A soda-lime-silica glass that has a composition comprising 60-80 wt % SiO.sub.2; 8-18 wt % Na.sub.2O; 5-15 wt % CaO; 0-3 wt % Al.sub.2O.sub.3; 0.0010-0.050 wt % silver expressed as Ag.sub.2O; and 0.005-0.30 wt % bismuth expressed as Bi.sub.2O.sub.3 is disclosed. Light-scattering silver colloids are dispersed throughout the soda-lime-silica glass to provide the glass with a yellow coloration. The soda-lime-silica glass may be in the form of a body that provides a shape of a container that defines an internal containment space. The body of such a container includes a base, a mouth that defines an opening to the internal containment space, and a wall that externs from the base to the mouth. A method of making a glass container that exhibits a yellow coloration is also disclosed.

A method for producing ultra-thin glass sheets is provided that results in glass sheets with high edge strength. The method includes: hot forming a continuous glass ribbon with a glass thickness from molten glass; annealing the glass ribbon with an annealing rate chosen based on the glass thickness; producing a laser beam focus area that is longer than the glass thickness; introducing filamentary defects into the glass ribbon using the laser beam so that the filamentary defects extend from one face to the opposite face and are spaced apart from one another along the breaking lines to produce transverse breaking lines and longitudinal breaking lines with margins each comprising a thickened bead; separating the beads along the longitudinal breaking lines and separating glass sheets by severing along the transverse breaking lines.

Silica-titania glasses with small temperature variations in coefficient of thermal expansion over a wide range of zero-crossover temperatures and methods for making the glasses. The method includes a cooling protocol with controlled anneals over two different temperature regimes. A higher temperature controlled anneal may occur over a temperature interval from 750-950 C. or a sub-interval thereof. A lower temperature controlled anneal may occur over a temperature interval from 650-875 C. or a sub-interval thereof. The controlled anneals permit independent control over CTE slope and Tzc of silica-titania glasses. The independent control provides CTE slope and Tzc values for silica-titania glasses of fixed composition over ranges heretofore possible only through variations in composition.

Silica-titania glasses with small temperature variations in coefficient of thermal expansion over a wide range of zero-crossover temperatures and methods for making the glasses. The method includes a cooling protocol with controlled anneals over two different temperature regimes. A higher temperature controlled anneal may occur over a temperature interval from 750-950 C. or a sub-interval thereof. A lower temperature controlled anneal may occur over a temperature interval from 650-875 C. or a sub-interval thereof. The controlled anneals permit independent control over CTE slope and Tzc of silica-titania glasses. The independent control provides CTE slope and Tzc values for silica-titania glasses of fixed composition over ranges heretofore possible only through variations in composition.

Annealing treatments for modified titania-silica glasses and the glasses produced by the annealing treatments. The annealing treatments include an isothermal hold that facilitates equalization of non-uniformities in fictive temperature caused by non-uniformities in modifier concentration in the glasses. The annealing treatments may also include heating the glass to a higher temperature following the isothermal hold and holding the glass at that temperature for several hours. Glasses produced by the annealing treatments exhibit high spatial uniformity of CTE, CTE slope, and fictive temperature, including in the presence of a spatially non-uniform concentration of modifier.