Google stopped submitting patents to the USPTO: why?

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http://www.freesoftwaremagazine.com – Software patent wars have always existed: companies fought them (or paid up), sometimes quietly, sometimes making a big fuss. However, something has changed over the last year or so: people started getting directly affected by software patents (ask anybody wanting a Samsung Galaxy Tab in Australia for Christmas 2011...). Lately, two things came to my attention: Google acquired 200 patents from IBM. But, more interestingly: Google hasn't filed any patents over the last several months. This can be confirmed by looking at Google's own patent search. Why not? This is certainly a very fair ques (General)