74077477
Jul 9, 1990
Apr 21, 1992
wireless home and small business monitoring systems comprising FM transmitters, and FM receivers, personal alert pendants, entry keypads, passive infra-red detectors, momitor with FM receiver and telephone communication, smoke detectors, fire detectors, door and window sensors; and medical alerts; namely, alarms used to alert in the event of a medical or personal emergency
Electrical and Scientific Apparatus