Covers glasses of RI 1.80-1.96 and Abbe value 32-43 having compositions (Wt%) 20-50 GeO2, 30-50 La2O3, 0-15 BaO, 0-10 B2O3, 0-30 Ta2O5, and 0.30 Nb2O3, preferably 20-32, 35-43, 10-15, 0-6, 15-20, 0, in the same order, with, in addition, oxides of at least one of Li, Na, K, Mg, Ca, Sr, Zn, Cd, Si, Ti, Zr, Th, Pb, Al, As, Sb, totalling not more than 20 wt%. Combinations are covered in 15 claims.
Origin
Unknown
Journal Title
Usp 3 029 152, 10/4/62
Sector
Refractive Indexes
Class
RI 19