ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,558,811, issued on Feb. 24, was assigned to KNAUF GIPS KG (Iphofen, Germany).
"Method and apparatus for making a gypsum board" was invented by Sooraj Kumar Ambadi Omanakuttan Nair (Evanston, Ill.), Mark K. Hemphill (Hawthorn Woods, Ill.), Yijun Sang (Oak Park, Ill.) and Annamaria Vilinska (Chicago).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method and apparatus to manufacture gypsum board that directs a first portion of aqueous gypsum slurry to a front cover sheet, directs a second portion of aqueous gypsum slurry to a back cover sheet, passes the back cover sheet over a roller spaced above the front cover sheet so that a majority of the second aqu...