ALEXANDRIA, Va., March 5 -- United States Patent no. 12,239,502, issued on March 4, was assigned to Colgate-Palmolive Co. (New York).
"Personal care system and method" was invented by Xiaonan Zhang (Hillsborough, N.J.) and Yongxing Wu (Guangzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "In one embodiment, a personal care appliance includes an electric motor having a drive shaft. In response to a voltage signal, the drive shaft is oscillated in an oscillatory motion having an oscillation amplitude. A control circuit includes, in operable cooperation, a user interface, a processor, a pulse width modulation signal generator, and a power source. The control circuit supplies the voltage signal to the ...