Inventor
CARSTEDT JOHN K
US3 patents
Patents
3 patentsUS4943806AJul 24, 1990
Touch input device having digital ambient light sampling
CARROLL TOUCH INC87 citations93
US4645920AFeb 24, 1987
Early fault detection in an opto-matrix touch input device
CARROLL TOUCH INC60 citations93
US4684801AAug 4, 1987
Signal preconditioning for touch entry device
CARROLL TOUCH INC93 citations92