REVO's patent was first issued in 2007, Huong. Your question: How come REVO has just had a license in 2012 and they were in talk of production in 2009 ? The simple answer: Patent and Intellectual Property On March 20, 2007, the United States Patent and Trademark Office issued to the Company a patent, number 7,193,644 Source: http://www.sec.gov/Archives/edgar/data/1320767/000126493110000140/form10-k.htm The patents that were big 'news' in 2012 are all based on the core patent issued in 2007.