The owner of IPNav, which has sued 1,638 companies charging patent infringement, explains his methods to the New York Times. “Mr. Spangenberg has been called ‘a costly nuisance,’ ‘one of the most notorious patent trolls in America’ and many unprintable names in the comments sections of Web sites like Techdirt. He has achieved a certain infamy,” as well as an annual estimated income of $25 million a year. And from Timothy Lee at the Washington Post: “Here’s what it feels like to be sued by a patent troll.“
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