Apple Inc.
Sapphire and glass laminates with a gradient layer

Abstract:

A sapphire sheet is laminated to a glass sheet with a gradient layer that transitions from a composition of predominantly Al.sub.2O.sub.3 at the sapphire sheet to a composition of predominantly SiO.sub.2 at the glass sheet. The gradient layer chemically bonds to both the sapphire sheet and the glass sheet and has no distinct interfaces.