It doesn't seem like they have registered it. Last year Fernando wrote that he hadn't (https://mail.scipy.org/pipermail/ipython-dev/2015-March/016231.html htt

It doesn't seem like they have registered it. Last year Fernando wrote that he hadn't (https://mail.scipy.org/pipermail/ipython-dev/2015-March/016231.html https://mail.scipy.org/pipermail/ipython-dev/2015-March/0162...) and searching TESS yields no results (http://tmsearch.uspto.gov/bin/gate.exe?f=searchss&state=4806:ztg92x.1.1 http://tmsearch.uspto.gov/bin/gate.exe?f=searchss&state=4806...). That said, I am much more interested in what the Jupyter devs really want rather than any legal questions.