It seems that there is prior art at least for claims 1 and 2:
Huang, C.F. Precise Location of Touch Panel by Employing the Time-Domain Reflectometry. SID Symposium Digest of Technical Papers, 40(1), June 2009, pp. 1291-1293.
Collins, Ryan V. Methods and apparatus for receiving user
input via time domain reflectometry. US-Patent 2004/0239616 A1
Furthermore, the general principle of touch sensing using TDR has already been described in 1964:
"In exposed circuits one can touch the line to produce an added echo.
Then, by running the point of contact along the line till this added
echo coincides with the system echoes, one can literally put his
fingers on the troubles. In a coaxial cable, one can produce a
reflection by squeezing the cable."
Oliver, B. M. Time Domain Reflectometry, HP Journal 15(6), 1964.