Speaking as a guy who actually holds Trademarks I can say that you are good with Ebux. As long as you dont open a conflicting company with these:
http://tess2.uspto.gov/bin/showfield...ate=fvtmof.2.3
http://tess2.uspto.gov/bin/showfield...ate=fvtmof.2.2
(If these links dont work do a new TO search:
http://tess2.uspto.gov/bin/gate.exe?...ate=fvtmof.1.1)
You are fine.
When I trademarked Trackpads for example I found out that UPS actually trademarked the name "Trackpad" for their little handheld scanners. But the USPTO said I could have Trackpads because I was not in the shipping business.
I think you are fine with the name.
-Jason