Peter Zura has an excellent post at his 271 Patent Blog about the latest statistical analysis of patent litigations by Professor Paul Janicke of The University of Houston Law Center — you can read Prof. Janicke’s study here or get a copy of his related PowerPoint slides here. Of particular note to readers of the Blog, the Northern District remains in the top five districts based upon the number of patent filings, with almost 5% of the nation’s patent cases filed here. Zura also notes that the median verdict was $4.2M, which is almost the median cost litigants pay to take a $25M+ patent case to trial ($4.5M according to the 2005 AIPLA survey). Finally, post-eBay permanent injunctions are denied 25% of the time, as opposed to 16% pre-eBay.