In the Wall Street Journal article Patent Litigation Up in 2015, Despite Efforts to Rein it In, Ashby Jone's refers to a RPX report as supporting that non-practicing entities (NPEs) lawsuits seeking to monetize patents are flourishing in 2015 despite Congress' patent reform efforts and the Supreme Court decision making it more difficult to get a software patent in Alice.
The article is interesting, but doesn't explain why patent infringement lawsuits filed vary in 2013-2015:
2015: NPEs filed 3,604 lawsuits
2014: NPEs filed 2,891 lawsuits
2013: NPEs filed 3,733 lawsuits
Despite lots of activity, Congress didn't pass any significant patent reform in 2013-2015. Further, although the Supreme Court's heightened standard for software patent eligibility in Alice might explain why less software patent owners would want to file a lawsuit in 2014, it doesn't explain the rise in lawsuits in 2015.
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