The number of patent suits filed in district courts continued to rise in 2013 and has more than doubled in the past five years, according to the first-ever patent litigation year in review published by the legal analytics company Lex Machina.

Using data from its popular legal analytics platform, Lex Machina published a report Tuesday that offers insight into judges, districts, patents, damages and filings. It focuses on major trends and developments in patent litigation during 2013.