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Bloomberg: Apple Patent Review Limits Leverage of Smartphone Rivals http://www.bloomberg.com/news/2012-12-21/apple-patent-review-with-years-to-go-limits-rivals-leverage.html explains impact of reexaminations, preliminary rejections 
Apple Inc.’s patents behind the pinch-to-zoom, bounce-back and multitouch features of its iPhone aren’t invalid, at least not yet.
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