ALEXANDRIA, Va., July 21 -- United States Patent no. 12,686,149, issued on July 21, was assigned to KNAUF GIPS KG (Iphofen, Germany).
"Method and apparatus for making a gypsum board" was invented by Mark K. Hemphill (Hawthorn Woods, Ill.), Annamaria Vilinska (Chicago), Yijun Sang (Oak Park, Ill.) and Sooraj Kumar Ambadi Omanakuttan Nair (Evanston, Ill.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method and apparatus to manufacture gypsum board that directs an aqueous gypsum slurry to a second cover sheet, and passes the second cover sheet over a roller spaced above a first cover sheet so that a majority of the aqueous gypsum slurry of falls off the second cover sheet to deposit over the first cover shee...