For any user willing to complement Patentsview data with PATSTAT I made available in my blog at

https://rawpatentdata.blogspot.it/2018/04/patentsview-patstat-concordance.html

a table of concordance between patent_id (Patentsview main key) and appln_id (from PATSTAT) and some basic statistics.

PATSTAT complements perfectly Patentsview since the latter links US data to other offices, allowing to calculate knowledge spillovers, family data etc.

Overlapping of the two datasets is not perfect since Patentsview contains only granted patents after 1975, where PATSTAT has also application (ungranted) and timeframe covers also pre-1975 data.