Rockstar Consortium, a patent-holding company formed from the bankrupt Canadian telecom company Nortel, sued Google and manufacturers of Android phones over patents almost two months ago.
Since Rockstar is part owned by Apple and Microsoft, the move looks like a major escalation of the patent wars that have brewed over Android.
This week, Google filed its counter-attack seeking to invalidate Rockstar’s patents. That’s a normal step for a defendant in a patent suit. But notably, Google didn’t file in the East Texas court in which it was sued. Instead, in a play for venue, Google has sued Rockstar on its home turf in Northern California.

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