In reference to the patent: US7441367
What royalties would be due for an implementation of this patent (Or is the intent to prevent said invention from being implemented)?
Royalty payments, to my understanding, are negotiated and memorialized in a contract between the parties, often without one party bringing a lawsuit. Alternately if one wanted to enforce his or her patent retrospective royalties may either be a) agreed to in a settlement of a judicial proceeding or b) adjudicated as damages by a judge.
Just as Maca said above, the decision on whether to license out a patent (e.g., gain royalties) or enforce the patent via the judicial system is the patent owner's.