In 2011, patent law was revised for the first time since the mid-20th century which, among other things, changed the U.S. from a “first to invent” to a “first to file” type of system. Because of the reform, many differences exist in the way patents are filed and assigned, so even if you have filed for patents before, you may want to seek the advice of an attorney familiar with the new laws. This guide will get you started.