Patent ID: 8561429
Filing Date: 2013-10-22
Classification: C03C

Abstract:
1. A method of strengthening a glass, the method comprising the steps of: a. providing the glass, the glass having a surface; and b. successively immersing at least a portion of the glass in a plurality of ion exchange baths, the ion exchange baths comprising a first ion exchange bath, the first ion exchange bath comprising a first metal, and a second ion exchange bath, the second ion exchange bath comprising a metal that is different from the first metal, to create a compressive stress in an outer region to strengthen the glass, the outer region extending from the surface to a depth of layer, wherein the compressive stress creates an integrated central tension of less than or equal to about 3.2 MPa·cm in a central tensile region of the glass, wherein each of the plurality of ion exchange baths are at a temperature in a range from about 410° C. to about 430° C.