Beacons or beacon systems transmitting signals having a characteristic or characteristics capable

Official title: Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith (position fixing by co-ordinating a plurality of determinations of direction or position lines G01S5/00)

G01S1/00 (Beacons or beacon systems transmitting signals having a characteristic or characteristics capable) appears on 3,425 US grants and 3,234 published applications in this corpus.