ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,420,326, issued on Sept. 23, was assigned to Rockhouse International Pty Ltd (Molendinar, Australia).
"Punch and die assembly" was invented by David Hancock (Oxenford, Australia) and Douglas Arthur McDonald (Oxenford, Australia).
According to the abstract* released by the U.S. Patent & Trademark Office: "A punch and die assembly for a forming assembly for forming flared openings in commercial forming steel sheeting, includes a punch. The punch has a punching element having a base portion and a working portion that extends from a face of the base portion, the working portion defining a working edge with more than two substantially evenly spaced peaks and troughs for forming an openin...