03.01.18
US Patent No. 9,872,821 B1; Liqwd, Inc., Santa Barbara, CA, has patented a method of curling hair. The method entails applying a formulation comprising one or more hydroxide-containing agents and one or more active agents selected from the group consisting of maleic acid, acrylic acid, methyl acrylic acid and vinyl sulfonic acid, and simple salts thereof to the hair; and reshaping the hair. The method is substantially free of a sulfur-containing reducing agent.