1
Leonard R Kasday: Touch position sensitive surface. AT&T Bell Laboratories, David H Tannenbaum, November 20, 1984: US04484179 (212 worldwide citation)

A touch sensitive device is arranged with substantially parallel surfaces which are at least partially transparent to light. A flexible membrane is supported above the top surface of the screen and when the overlay is flexed into contact with the screen, light which had passed through the screen, is ...


2
James B Mallos: Touch position sensitive surface. Bell Telephone Laboratories Incorporated, David H Tannenbaum, August 24, 1982: US04346376 (122 worldwide citation)

A touch sensitive device is arranged with substantially parallel surfaces inside which light from a synchronized source, such as a CRT, can become trapped by total internal reflection. The edges of the device are fitted with photodetectors which respond to the entrapment of light within the surfaces ...


3
Kubik Peter S, Alles Harold G: Surface sensible au toucher, Touch position sensitive surface. Ncr Corporation, KIRBY EADES GALE BAKER, November 19, 1985: CA1196987

TOUCH POSITION SENSITIVE SURFACE AbstractA touch sensitive device is arranged withsubstantially parallel surfaces inside which light from asynchronized source, such as a CRT, can become trapped bytotal internal reflection. The screen is fitted withphotodetectors which respond to the entrapment of li ...