The official complaint from Channel Intelligence states the US patent number but it only vaguely mentions that they 'own the foreign equivalents'. I thus decided to search for them, and I found this: http://register1.epoline.org/espacenet/regviewer.

It turns out that the equivalent European patent is still under examination. I've contacted the Belgian patent office to see what the local status is and they're getting back to me shortly. With the abundance of prior art, it might actually be easy to stop the patent from being granted in Europe now. Apparently it's much more effective to intervene during the examination process than it is to contest the patent once it's granted.