An improved battery saving circuit for radio receivers and/or radio transceivers and/or radio communication systems of same under the control of one or more control radio transmitters and/or transceivers. The "on" and "off" time intervals for the battery saving circuits in all remote radio receivers...http://www.google.es/patents/US4449248?utm_source=gb-gplus-sharePatente US4449248 - Battery saving radio circuit and system
