Take the 2-minute tour ×
Ask Patents is a question and answer site for people interested in improving and participating in the patent system. It's 100% free, no registration required.

Resolved - patent examiner independently struck down claims - see comment below.

Does anybody know of any prior art related to US20110128257 ?

The patent US20110128257 claims a provisional application date of Nov 29 2009.

share|improve this question
It is unclear what you are asking -- please see the help pages for how to format different types of questions. –  Soren Aug 18 at 14:54

1 Answer 1

up vote 2 down vote accepted

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.

and possibly

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.

Edit: According to the Public PAIR, the patent examiner struck down claims 1-5 as being already described by Kozik et al. (US 5149918). The patent only refers to optical TDR now.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.