This is a bit "long in the tooth" but the techy readers may enjoy this GT presentation from 5/22/2013. http://electronics.wesrch.com/paper-details/pdf-EL1NABM8TGWZG-sapphire-touch-performance-and-design-guidelines-for-display-cover-screens#page13 I believe that the original NDA was dated early / mid 2013 and the agreement executed 11/2013 so this may have been part of the sales presentation.