Patent ID: 9593042
Date: 2017-03-14
CPC Classifications: C03C

Claim:
1. A glass-based article comprising: a first surface and a second surface opposing the first surface defining a thickness (t); and a concentration of a metal oxide that is both non-zero and varies along a thickness range from about 0·t to about 0.3·t, as measured by microprobe; a stress profile, as measured by a combination of scattered light polariscope and surface stress meter, that decreases from the first surface to a value between the first surface and the second surface and increases from the value to the second surface; and a CT region of the stress profile, wherein the CT region is defined by the equation Stress(x)=MaxCT−(((MaxCT·(n+1))/0.5 wherein MaxCT is a maximum CT value and is provided as a positive value in units of MPa, x is position along the thickenss (t) in micrometers, and n is between 1.5 and 5.