Patent ID: 11968794
Assignee: CORNING INCORPORATED
Field: Materials, metallurgy (Chemistry)
Classification: CPC H  C | IPC C  H

Claim 19:
20. A method of making a glass-based article, the method comprising:
chemically strengthening a glass-based substrate having a thickness in a range of from greater than 500 microns to less than or equal to 2.0 mm to provide the glass-based article comprising:
a compressive stress layer extending from a surface of the glass-based article to a depth of compression (DOC) in range of from greater than or equal to 13% to less than or equal to 20% of the thickness,
a spike extending from the surface of the glass-based article to a spike depth (DOLsp) that is less than the DOC; and

continuing the strengthening until a central region of the glass-based article comprises a tensile stress in a range of from greater than or equal to 0.5 MPa to less than or equal to 20 MPa,
wherein there is a compressive stress at the surface of greater than or equal to 300 MPa, and
wherein the glass-based article is formed of a glass composition comprising from greater than 0 mol % to less than or equal to 20 mol % R2O, R2O being the total amount of alkali metal oxides in the composition.