ALEXANDRIA, Va., Sept. 3 -- United States Patent no. 12,404,075, issued on Sept. 2, was assigned to Calumet Carton Co. (South Holland, Ill.).
"Blank and paperboard envelope formed therefrom" was invented by Robert Dennis Byrne (Cedar Lake, Ind.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A blank including a single rectangular sheet of paperboard having opposed top and bottom edges and opposed left and right edges. The sheet has a midline spaced equally from the left and right edges, with a cut that extends from the top edge to a point spaced from the top edge, and a fold line that extends from the point to the bottom edge. The sheet also has a first zone that extends from midline to right edge along the b...