But think about it. If RPX is correct that IPRs have only been filed against 4,330 patents since available in 2012, while the USPTO reports 11,148 IPR petitions filed from beginning (Sept. 16, 2012) until recently (Aug. 31, 2020), we have a difference. Let's assume both RPX and the USPTO are correct. Why the difference? I am thinking the difference is attributable to the current practice of filing multiple petitions against certain patents. Many patent may escape an IPR, but for valuable patents, it's "war by attrition."
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