There were a number of patents assigned this year. Surprisingly many, for a company in seemingly so much trouble [1]; this display makes it easier to see the assignment dates [2]. Perhaps this is staying the hand of the investors for now, and they're performing some independent due diligence.
[1] http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=H...
[2] http://patents.justia.com/assignee/theranos-inc