Controlled flattening of sheet materials
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United States of America Patent
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Feb 24, 2015
Grant Date -
N/A
app pub date -
Mar 15, 2013
filing date -
Mar 15, 2013
priority date (Note) -
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Abstract
Controlling a flatness of a first surface of a sheet material can include: (a) determining a first surface contour of the first surface of the sheet; (b) applying compressive stresses to one or more portions of the first surface of the sheet after the determination of the first surface contour of the sheet; (c) annealing compressive stresses in one or more portions of the first surface of the sheet after the determination of the first surface contour of the sheet; (d) determining a second surface contour of the first surface of the sheet after the compressive stresses have been applied to, and annealed from, the sheet; (e) comparing the second surface contour to a threshold flatness; and (f) performing (b)-(e) one or more times until the determined second surface contour is less than the threshold flatness.
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