• Patent Risk Advisory Firm RPX Files For An IPO

    “Defensive patent aggregator”RPX (Rational Patent) filed an S-1 form with the SEC  on Friday, stating its intention to go public. According to the form, RPX is looking to sell up to $100 million of its shares in an IPO underwritten by Goldman Sachs, Barclays, Allen & Company LLC and others. Co-founded by former Intellectual Ventures VPs John Amster and Geoffrey Barker, RPX… Read More

  • Patent Defense Play RPX Closes Series B From Index, Kleiner, And Charles River

    Defense Play RPX, a defensive patent aggregator, has raised an undisclosed amount of Series B funding led by Index Ventures with Kleiner Perkins Caufield & Byers and Charles River Ventures participating. The company also raised an undisclosed Series A round of funding in September 2008 from Kleiner Perkins and and Charles River Ventures. RPX first launched in November 2008 as a way to… Read More

  • Is RPX's "Defensive Patent Aggregation" Simply Patent Extortion By Another Name?

    Patent litigation is getting so bad that a new startup, RPX Corp. (aka, Rational Patent) is gearing up to help companies defend themselves specifically against patent trolls (organizations that buy up patent portfolios with the express intention of forcing other companies to license those patents or face a lawsuit). RPX markets itself as a “defensive patent aggregator.” It buys… Read More