A remote control device having, in one embodiment, a keypad including a time-lock key and another key; means for locking the other key for a time period specified by a user in response to a depression of the time-lock key; and a transmitter for transmitting a channel select signal in response to a depression...http://www.google.es/patents/US5883680?utm_source=gb-gplus-sharePatente US5883680 - Remote control of a television receiver with locator feature or the like
Remote control of a television receiver with locator feature or the like
