ALEXANDRIA, Va., July 9 -- United States Patent no. 12,350,491, issued on July 8, was assigned to MARY KAY INC. (Addison, Texas).

"Method for determining facial muscle responses" was invented by Shona Burkes-Henderson (Dallas), Geetha Kalahasti (Plano, Texas) and David Gan (Southlake, Texas).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for quantitatively assessing muscle contraction of a facial muscle in a person and determining the ability of a treatment material to reduce contraction of the facial muscle is disclosed. The method can include applying an external electrical stimulus to facial skin sufficient to contract a facial muscle, measuring the contractile activity of the contracted facial mu...