PCT patent publications also show a rapid rise in hydraulic fracturing (HF) patenting, much like for U.S. patent publications. For example, from 2001 to 2006, 5-10 HF PCT patent applications published per year. Starting in 2007, this jumped unexpectedly to 22 and the trend has been maintained since then. In other words, the patent publication rate doubled starting around 2007.
For purposes of this blog, HF patents were those including the term in the abstract, which is one form of isolating patents which focus heavily on HF. In particular, 2010 showed 17 HF PCT patent publications; 2009 showed 20 HF patent publications; 2008 showed 19 HF publications, and 2007 showed 22 patent publications.