Google on Monday announced it will open an experimental portal to purchase patents from their holders between May 8 and May 22. The move is widely seen as an attempt to shut off patent trolls. Patent holders have to set the price at which they’re willing to sell their IP, and they will be told by June 26 whether Google wants to buy. Payments will be made through ACH by late August. “I’m all for patent marketplaces, but I don’t think this solves any of the issues Google discusses,” said Tirias Research analyst Jim McGregor.