Isaac Rabicoff files a lot of patent infringement suits. As counsel for frequent filers like Cedar Lane Technologies, WSOU Investments, Symbology Innovations and others, his name graces some 600 infringement suits filed over the last two years, according to Lex Machina data.

Rabicoff Law is based in Chicago, but like a lot of patent litigators, Rabicoff appears in courts all over the country. Nearly half of those 600 suits were filed in Delaware or Texas, with another 85 in California.