U.S. Silica to appeal Patent Office decision Seeking Alpha
U.S. Silica ([[SLCA]] -4.8%) says its SandBox unit will appeal the U.S. Patent Office’s decision to invalidate challenged claims in one of the patents at i.
U.S. Silica to appeal Patent Office decision Seeking Alpha
U.S. Silica ([[SLCA]] -4.8%) says its SandBox unit will appeal the U.S. Patent Office’s decision to invalidate challenged claims in one of the patents at i.