A method and apparatus for allowing or disrupting passage of power in electrical appliances includes a portable wireless remote control device and a device in the form of an electronic circuit contained within one particular electrical appliance that is adapted for allowing or disrupting passage of power...http://www.google.com.au/patents/US6282451?utm_source=gb-gplus-sharePatent US6282451 - Method and apparatus for allowing or disrupting passage of power in electrical appliances