30 patents in five countriesUSPTO search terms for Evonik as Assignee AND Separator in Title
Yeilds 17 patents: So 30 patents in five countries is six USPTO patents acquired. So which six did EFL purchase? I don't know but they all look pretty decent and this ceramic imbedded technology looks like good stuff with many advantages over traditional ubiqutous polymer separators and other ceramic coated products.
patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=0&f=S&l=50&TERM1=evonik&FIELD1=ASNM&co1=AND&TERM2=separator&FIELD2=TI&d=PTXT
i couldn't paste the results due to images missing https://, so need to follow link above to see them.