Covers glasses of better resistance to weathering and superior qualities with respect to workability and freedom from devitrification and having exceptionally high nu-values for a given index, e.g. v=62-63 for nD=1.62.
Origin
Eastman Kodak Company
Journal Title
U.S.P. 2,933,404 19.4.60
Sector
Primary Papers
Class
PP 950