Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Reexamination Certificate
2009-01-09
2011-10-04
Group, Karl (Department: 1731)
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
C501S063000, C501S077000, C501S078000, C501S079000
Reexamination Certificate
active
08030233
ABSTRACT:
An optical glass having optical constants of a refractive index (nd) of 1.78 or over, an Abbe number (νd) of 30 or below, and a partial dispersion ratio (θg, F) of 0.620 or below comprises SiO2and Nb2O5as essential components, wherein an amount of Nb2O5in mass % is more than 40%. The optical glass further comprising, in mass % on oxide basis, less than 2% of K2O and one or more oxides selected from the group consisting of B2O3, TiO2, ZrO2, WO3, ZnO, SrO, Li2O and Na2O wherein a total amount of SiO2, B2O3, TiO2, ZrO2, Nb2O5, WO3, ZnO, SrO, Li2O and Na2O is more than 90% and TiO2/(ZrO2+Nb2O5) is less than 0.32.
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Bolden Elizabeth A
Group Karl
Ohara Inc.
Westerman Hattori Daniels & Adrian LLP
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