ALEXANDRIA, Va., Aug. 25 -- United States Patent no. 12,716,176, issued on Aug. 25, was assigned to BILLERUD AKTIEBOLAG (PUBL) (Solna, Sweden).
"Assymetric paperboard" was invented by Fredrik Nordstrom (Karlstad, Sweden) and Johan Magnusson (Frovi, Sweden).
According to the abstract* released by the U.S. Patent & Trademark Office: "There is provided a multi-layered paperboard comprising a first outer layer, a second outer layer and at least one middle layer arranged between the first and the second outer layer, wherein the grammage of the first outer layer is at least 2.0 times higher than the grammage of the second outer layer. A method of producing the multi-layered paperboard is also provided."
The patent was filed on Aug. 11, 2022, u...