Lead- and barium-free crystal glass

Details Lead- and barium-free crystal glass Lead- and barium-free crystal glass

2007-04-10

2007-04-10

Group, Karl (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S064000

Reexamination Certificate

active

11522311

ABSTRACT:
A lead- and barium-free crystal glass having a refractive index of at least 1.55, with in % by weight, more than 50% and less than 60% SiO2, more than 0.6% and less than 4% B2O3, less than 3% K2O, more than 12% and less than 15% Na2O, more than 4% and less than 11% CaO, more than 0.25% and less than 5% Al2O3, less than 2% MgO, and between 8 and 16% ZnO, with the proviso that the total content of the oxides of Pb, Ba and As is below 0.1%, the total content of the oxides of Ti and La is below 5% and the total content of the oxides of Nb, Ta, Yb, Y, W, Bi and Zr is below 5%, wherein at most 1% oxides of Nb, Ta and Yb respectively and 3% of the oxides of Y, W, Bi and Zr respectively are included.

REFERENCES:
patent: 2433883 (1948-01-01), Armistead
patent: 5434111 (1995-07-01), Clement et al.
patent: 6184166 (2001-02-01), Hares et al.
patent: 6391810 (2002-05-01), Lenhart
patent: 00/09456 (2000-02-01), None

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