Patent ID: 9296637
Filing Date: 2016-03-29
CPC Classification: C03B

Claim Text:
1. A method for forming glass sheets comprising: initially forming a heated flat glass sheet to an upwardly concave curved shape with upper end portions and a lower intermediate portion extending between the upper end portions, with the upper end portions and intermediate portion having shapes with straight line elements, and with the glass sheet curved transversely to the straight line elements; locating the initially formed glass sheet below an upper mold having a downwardly facing surface with downwardly convex curvature along transverse directions; moving the end portions of the glass sheet upwardly relative to the intermediate portion to initially contact the end portions of the glass sheet with the downwardly facing surface of the upper mold to form the straight line elements of the end portions with curvature while the intermediate portion of the glass sheet still has straight line elements without any significant curvature; and thereafter moving the intermediate portion of the glass sheet upwardly relative to its end portions to contact the intermediate portion of the glass sheet with the downwardly facing surface of the upper mold to also form the straight line elements of the intermediate portion with curvature so the entire glass sheet is curved along transverse directions.