Passenger weight measuring apparatus

Passive alarm system for blind and visually impaired individuals

Passive container tracking device, system, and method

Passive electrical marker for underground use and method of maki

Passive environmental RFID transceiver

Passive garage door operator system

Passive infrared alarm device

Passive infrared detection system and method with adaptive thres

Passive infrared detector

Passive infrared detector

Passive infrared intruder detection system

Passive infrared intrusion detector

Passive infrared intrusion detector and its use

Passive infrared intrusion detector employing correlation analys

Passive infrared motion detection circuit having four comparator

Passive infrared motion detector and method

Passive intrusion detection system

Passive intrusion detection system

Passive microwave fire and intrusion detection system...

Passive microwave speed and intrusion detection system