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US 4,225,070 AGranted
Method of simultaneously opening two scores transverse to one another
AssigneePPG Industries, Inc.
InventorsJohn R. Dahlberg, Robert P. DeTorre
Life of this patent
Estimating the term…
Abstract
Intersecting first and second scores in a glass sheet are simultaneously opened by imposing deeper first scores in the glass sheet than second scores. A bending moment force applied to a second score opens the second score and the resulting shock from opening the second score opens portions of the intersecting first scores.
Claims10
A method of simultaneously opening transverse scores imposed in a sheet of refractory material comprising the steps of:
- imposing at least one first score and at least one second score in the sheet, the scores transverse to one another and the at least one first score having a depth greater than the at least second score;
- and
- applying a bending moment force to the at least second score of sufficient magnitude to open the at least second score and open at least a portion of the at least first score by the shock resulting from opening the at least second score.
Dependencies are inferred from the claim text.