The purpose of this guide is to provide you with basic information about filing a utility patent application with the USPTO. To apply for a patent, you must file an application and pay required fees.This tutorial will focus on patents and the process for securing a patent in the U.S. First, let's consider why we have a patent system? It's totally possible to file a patent application without using a patent attorney. A provisional application is an application only that can be filed in the united states. The law specifies no lower limit to the amount that. Protecting your Inventions Abroad: Frequently Asked Questions About the Patent Cooperation Treaty (PCT). INTRODUCTION.