Patent ID: 11891324
Assignee: CORNING INCORPORATED
Field: Other special machines (Mechanical engineering)
Classification: CPC C  B  G  Y | IPC B  C

Claim 9:
10. A glass sheet for use in or on consumer electronic products, the glass sheet comprising:
glass comprising soda-lime glass, alkali aluminosilicate glass, alkali-containing borosilicate glass, alkali aluminophosphosilicate glass, or alkali aluminoborosilicate glass;
a first major surface opposite a second major surface with an interior region located therebetween;
wherein surface fictive temperature measured on the first major surface is at least 50° C. above a glass transition temperature of the glass of the glass sheet;
wherein an average thickness between the first and second major surfaces is less than 2 mm;
wherein an ion content and chemical constituency of at least a portion of both the first major surf ace and the second major surface is the same as an ion content and chemical constituency of at least a portion of the interior region;
wherein the first and second major surfaces are under compressive stress greater than 150 MPa and at least a portion of the interior region is under tensile stress;
wherein a surface roughness of the first major surface is between 0.2 and 1.5 nm Ra roughness, and wherein a surface roughness of the second major surface is between 0.2 and 1.5 nm Ra roughness;
wherein stress within the glass sheet varies as a function of position relative to the first and second major surfaces, wherein the stress has a change of at least 200 MPa over a distance of less than 500 μm of thickness of the glass sheet.