Patent No. EP3792228 (titled "Ion Exchanged Glasses Via Non-Error Function Compressive Stress Profiles") was filed by Corning Incorporated on Feb 27, 2013. The application was issued on Jul 31, 2024.
Glass with non-traditional compressive stress profile for chemical strengthening, comprising a surface region under compressive stress with a maximum stress at the surface and a tensile stress region extending from the depth of layer into the glass. The tensile stress in the second region is determined by a triangle approximation and is limited by a function of glass thickness, ensuring non-frangibility.

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