Patent ID: 11905202
Assignee: CORNING INCORPORATED
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 7:
8. A method of modifying a glass substrate comprising:
generating surface features with peaks and valleys on a first surface of a glass substrate, the surface features providing a roughness average (Ra) within the range of 10 nm to 2000 nm;
after the generating surface features, smoothing the surface features by contacting the glass substrate with a polishing etchant such that the valleys are widened;
after the smoothing the surface features, generating a region of the glass substrate that is under compressive stress, the region extending from the first surface to a depth of compression (DOC); and
removing a portion of the region of the glass substrate that is under compressive stress from the first surface into the depth of compression to define a new first surface still having surface features with peaks and valleys providing a roughness average (Ra) within the range of 10 nm to 2000 nm,
wherein, the removing the portion of the region of the glass substrate that is under compressive stress from the first surface into the depth of compression to define the new first surface comprises contacting the first surface with a light etchant that is a liquid comprising sodium hydroxide within a range of 5 wt % to 50 wt %,
wherein, the removing the portion of the region of the glass substrate that is under compressive stress is conducted such that the portion has a thickness within the range of 0.5 μm to 2 μm, and
further wherein the contacting the first surface with a light etchant is conducted at a temperature from 90° C. to 140° C. for 2 minutes to 120 minutes.