Indeed you can be sued anywhere for anything, but the matter of jurisdiction arises quite quickly in many cases. Also, American patent trolls don't seem to attempt to sue foreign companies that don't have a presence in the US.
"American patent trolls don't seem..." where did you pull that out of... sounds pretty but you got nothing to back up that statement.
Anyway, you appear to be a troll of the internet variety, so I'll leave you in peace because you're in no way trying to debate, but antagonize.
Have you searched the US Court Databases?
As an attorney - I have. Check out lexisnexis for case law. There are hundreds of cases of US owners of patents suing and litigating against international infringers... literally hundreds.
Also, you are totally discrediting the monopolies that run the world and how they have prevented other companies from entering their markets via other aggressive methods or patent purchasing...
Why don't you cite a handful of recent cases (<5 years) in which a British or German software company has been successfully sued in the US for infringing upon a US-registered software patent by a US patent troll? I'm not saying you're wrong, and of course just because I haven't found anything doesn't mean it doesn't exist, but the odds of being successfully sued by a patent troll as a foreign business are vastly less than being sued as a US company. Even if a patent troll were successful in securing judgment (perhaps by default), enforcing a judgment against a foreign company is vastly harder than a domestic one; patent trolls like easy wins.
Nobody in Europe is complaining about US patent trolls suing them because to the best of my knowledge, it doesn't happen. If it does, it's so infrequent that it's a non-issue.
I assume you're a troll because of your comment history. I mean, c'mon, you pretended to be able to read my mind and asserted that my lack of desire to open up an office or business in the US was not because of the risk and costs of a patent troll's attempt at a shake-down, but rather because I don't know how to form a company, or that I'm not a US citizen! If you're really a lawyer I doubt you'd be making such claims.
Buying and litigating patents is A LOT of work.
I am not supporting them - but you can't discredit their work just because you don't believe in what they legally are entitled to do.
I don't support big oil or old-school-energy monopolies - but that doesn't mean I discredit what they do.
That's not an argument. Make-work is not valuable.
you can't discredit their work just because you don't believe in what they legally are entitled to do
Well, sure you can. Just because it's legal does not mean it's ethical. You're a lawyer, you should understand that.