When the World Business Council on Sustainable Development in January 2008 launched the Eco-Patents Commons in partnership with IBM, Sony, Nokia and Pitney-Bowes, it was an unprecedented step in the development of clean technologies. Here were leading companies -- and, in IBM's case, the U.S. company with the most patents, year after year -- giving away ideas so that other companies could either apply to their own operations or work from to develop their own, new and patentable inventions. Now, just nine months after the launch of the Commons, three more companies have joined, and have more than doubled the total number of eco-patents available with their new commitments. Together, Xerox, Dupont and Bosch, along with new patents from Sony, have committed 53 new patents to the 31 currently on the list.