Frankly, I don't understand the meme of patent troll, and why anybody who invents, patents, and defends their patents is automatically labeled troll for doing this if they are not a big name company.
Likewise, companies that buy and exploit patents for their economic potential, why are these labelled trolls? It's like those accused of infringement wave the troll card in an attempt to create a different class of patent holder, one not entitled to gain economic benefit from their IP nor be allowed to defend it.
If the idea of Intellectual Property is to have any value, and the process of protecting it, i.e. by patenting and defending it, and the process of it being portable through sale, assignment, or licensing, just like any other property is to have any meaning, we have to stop waving the troll flag any time the owner of a patent wants to assert the right to defend said patent when it feels that patent is being infringed.
To continue to say troll this and troll that and "it's a troll just because they are a foreigner, or don't manufacture, or don't create US jobs"*, is just stupid and undermines the whole idea of what a patented invention is.
* none of which are the basis of a patent award or the holder's right to defend.