ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,662, issued on Sept. 23, was assigned to VALMET AB (Sundsvall, Sweden).
"Yankee drying cylinder and a tissue paper making machine" was invented by Ola Jonsson (Hammaro, Sweden).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to steel Yankee cylinders for tissue-making machines and tissue-making machines using such steel Yankee cylinders wherein the outer surface (9) of the cylindrical shell of the steel Yankee cylinder is formed by a steel of the grade P690 as defined in European Standard EN 10028-6:2017 or a similar steel."
The patent was filed on Oct. 20, 2021, under Application No. 18/044,472.
*For further information, incl...