ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,734,787, issued on Sept. 15.
"Playboard" was invented by Leigh McTegg (Wynnum West, Australia).
According to the abstract* released by the U.S. Patent & Trademark Office: "A playboard includes a first ferromagnetic metal plate, a first coating on an outer side of the first ferromagnetic metal plate, a first polyolefin film adhered to the inner side of the first ferromagnetic metal plate, a layer of low density polyethylene on the first polyolefin film adhered to the inner side of the first ferromagnetic metal plate, a second polyolefin film adhered to the layer of low density polyethylene on the first polyolefin film adhered to the inner side of the first ferromagnetic metal plate. ...