Back to results
US 4,289,261 AGranted
Method of thermally inducing bending moment forces to sever a glass sheet along a score
AssigneePPG Industries, Inc.
InventorJ. Robert Dahlberg
Life of this patent
Estimating the term…
Abstract
Scores imposed in a glass sheet are propagated by heating the sheet about the score to induce thermal bending moment forces about the score to sever the sheet.
Claims5
A method of severing a sheet of refractory material having a thickness of less than about 0.120 inches (0.305 centimeters) comprising the steps of:
- contacting a surface of the sheet with scoring means to define a contacted sheet surface and to impose a score in the sheet having a depth of at least about 80% of the sheet thickness;
- and
- heating portions of the contacted sheet surface on each side of the score to a temperature greater than the temperature of the opposite sheet surface to thermally induce bending moment forces about the score to sever the sheet along the score.
Dependencies are inferred from the claim text.