Corning Incorporated

Lisa A Tietz

George Bigelow Hares

Roger A Miller

A dense barium crown glass consisting essentially of, as calculated in weight % on an oxide basis, 35-42% SiO.sub.2, 11-17% B.sub.2 O.sub.3, 5.5-7.7% Al.sub.2 O.sub.3, 35-42% BaO, 0.25-1.5% Li.sub.2 O. The glasses have a liquidus temperature bellow 900.degree. C. and a viscosity at the liquidus temperature that is greater than 1000 Pa.s (10,000 poises).

Dense barium crown optical glasses

This invention relates to fine glass crystal prepared from lead-free glass compositions. The glasses consist essentially, in weight percent, of

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Painted Post, NY, United States of America

Lisa A Tietz