Title 35 of the United States Code is a title of United States Code regarding patent law. The sections of Title 35 govern all aspects of patent law in the United States. There are currently 37 chapters, which include 376 sections (149 of which are used), in Title 35.Title 35 has four parts, which are delved into further later in the article: Part I—United States Patent and Trademark Office, Part II—Patentability of Inventions and Grant of Patents, Part III—Patents and Protection of Patent Rights, Part IV—Patent Cooperation Treaty.