1
Bruce H Edwards: Ultrasonic position locating method and apparatus therefor. Logitech, Townsend and Townsend, August 25, 1992: US05142506 (113 worldwide citation)

A positional locating method and apparatus (10) for measuring distances by accurately determining the transit time of ultrasonic wave bursts (22) between two or more points is disclosed. Timer clocks (60), (62), (64) and (66) are started when each of the bursts (22) is triggered to be emitted from a ...


2
Edwards Bruce, Glickman David, Barnes James, Mcclure Ron: Ultrasonic position locating method and apparatus therefor. Logitech, SMART John A, April 30, 1992: WO/1992/007346 (4 worldwide citation)

A positional locating method and apparatus (10) for measuring distances by accurately determining the transit time of ultrasonic wave bursts (22) between two or more points is disclosed. Timer clocks (60), (62), (64) and (66) are started when each of the bursts (22) is triggered to be emitted from a ...


3
Edwards Bruce, Glickman David, Barnes James, Mcclure Ron: Ultrasonic position locating method and apparatus therefor.. Logitech, August 11, 1993: EP0554346-A1 (1 worldwide citation)

A positional locating method and apparatus (10) for measuring distances by accurately determining the transit time of ultrasonic wave bursts (22) between two or more points is disclosed. Timer clocks (60), (62), (64) and (66) are started when each of the bursts (22) is triggered to be emitted from a ...