US Patent 5,928,227
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
A remote control system and method for remotely controlling a supply of electrical power to an electrically powered device, the system comprising transmitting means for transmitting electromagnetic radiation, receiving means for receiving electromagnetic radiation, and first and second switching means. The remote control system and method provides for the hands-free operation of such an electrically powered device while allowing the operator the freedom of mobility in spatial relationship to the electrically powered device.
Howard III, Matthew A.; Abkes, Bruce; and Mirsky, Roman Remote controlled coagulator system and methods. US Patent 5,928,227 filed March 10, 1997 and issued July 27, 1999. https://ir.uiowa.edu/patents/215