ALEXANDRIA, Va., June 18 -- United States Patent no. 12,326,303, issued on June 10, was assigned to GAONTECH Co. LTD. (South Korea).
"Method for manufacturing counter flow total heat exchanger" was invented by Gil Sub Song (Incheon, South Korea), Eun Sook Hong (Incheon, South Korea) and Eun Jung Hong (Incheon, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for manufacturing a counter flow total heat exchanger is disclosed. The for comprises the steps of: inserting, between a pair of rollers (210, 210a) having protrusions formed on the surface thereof, a first paper having a first width, so as to form same into a single face corrugated cardboard sheet (T) having flow paths (111c, 121c); a...