Not my area of law, but there are appear to be several other "OnePass" trademarks out there:

http://tess2.uspto.gov/bin/showfield...h=Submit+Query

Which led me to this lovely item:

http://www.amazon.com/BioIonic-OnePa.../dp/B0014M2MOK

Anyway, if I remember law school correctly, the basic test for trademark infringement is "likelihood of confusion", which I really don't see here.