My office is a little unique in which we have a lot of products that we ultimately out-license to larger device companies. We develop the products and file patents on them and in some situations the market just isn’t there. Most of our products fail because there is a competitor in the market and our product isn’t differentiated enough to induce adoption. For example a manual surgical instrument is similar to an existing one or the procedure is now performed laparoscopically or robotically. In these cases, we ultimately abandon the patent.