ALEXANDRIA, Va., March 5 -- United States Patent no. 12,243,643, issued on March 4, was assigned to HENKEL AG & Co. KGAA (Duesseldorf, N.Y.).

"Determining external hair damage" was invented by Hans Georg Knuebel (Duesseldorf, Germany) and Erik Schulze Zur Wiesche (Bielefeld, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "An arrangement for determining external damage to hair is given. A device comprising: a reading unit adapted to obtain optical characteristics of hair; and a processing unit adapted to receive the optical characteristics from the reading unit and to determine surface properties of the hair from the optical characteristics, wherein the processing unit implements a pattern recognition ...