Long answer:- It depends. Search the forum for trade mark domains and read, and read, and read...and you probably still won't know for sure as it varies case by case. You may have a gripe site etc...but I'm guessing if that was what you were intending to use them for you wouldn't be asking this question.
Short answer:- why did you register them? If it is because they are well known products produced by major corporations and you thought there may be some money in it for you then I think you have already answered your own question... :smilewinkgrin:
Mods: Should this be in legal issues?