Patent 9221715 was granted and assigned to Apple (company) on December, 2015 by the United States Patent and Trademark Office.
A strengthened film for a substrate such as a glass panel is provided. The strengthened film may be formed by implanting sodium in the film, and then performing an exchange through which the sodium is replaced by potassium. The film may be an anti-reflective coating. Related assemblies and methods are also provided.