Not taking action with your patent will cost you over $250,000. And that’s not counting the cost of lost revenue opportunities or litigating any infringement. It’s estimated that the average cost over the course of the 20-year life span of a single patent is about $100,000.00 – or roughly $5,000 per year in maintenance fees. And that doesn’t begin to cover the initial investment, which on average is about $150,000.00 to develop a single patentable invention. That’s due in part because the U.S. patent office currently rejects about 65% of all patent applications.