Patent Center Overview provides details on how to file an application in Patent Center. Quick Clinic Video Series.A normal physiological condition such as "patent" (meaning open) "antegrade flow" (meaning flowing forward) of the vertebral arteries" is not dangerous. This page provides information on the types of patents and types of patent applications, and the examination process. 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? The Provisional Patent Application. This opening – the foramen ovale allows blood flow from the mother to the baby. (45) It is possible to prepare and file your own provisional patent application. Resource is restricted to current Virginia Tech students, faculty, and staff.