The present invention comprises a system for remote control of garage doors and other devices wherein an extremely large number of codes are available for remote transmitters for operating the garage operator and wherein each transmitter has its own unique and permanent nonuser changeable code. The receiver...http://www.google.de/patents/USRE36703?utm_source=gb-gplus-sharePatent USRE36703 - Coding system for multiple transmitters and a single receiver for a garage door opener
