The U.S. Patent Act of 1952 clarified and simplified existing U.S. patent law. It also effected substantive changes, including the incorporation of the requirement for invention (35 U.S.C. §103) and the judicial doctrine of contributory infringement (35 U.S.C. §271).

Provisions

The Act originally divided the patent law into three parts:

Part I — Patent and Trademark Office

Patent and Trademark Office

The Patent and Trademark Office may refer to:* the United States Patent and Trademark Office * the German Patent and Trademark Office...

 : contains provisions governing that Office, its powers and duties, and related matters.
Part II — Patentability of Invention and Grant of Patents : sets out when and how patents may be obtained.
Part III — Patents and Protection of Patent Rights : relates to the patents themselves and the protection of rights under patents.

A later amendment added

Part IV — Patent Cooperation Treaty : Intended to simplify the filing of patent applications for an invention in different countries, the Patent Cooperation Treaty

Patent Cooperation Treaty

The Patent Cooperation Treaty is an international patent law treaty, concluded in 1970. It provides a unified procedure for filing patent applications to protect inventions in each of its contracting states...

, signed by 35 countries by December 31, 1970, provides (inter alia) centralized filing procedures and a standardized application format. It helps expand established programs of American industry to file foreign patent applications, and encourages smaller businesses and individual investors to become more active in seeking patent protection abroad.

Other amendments to Title 35 concern the renaming from "Patent Office" to "Patent and Trademark Office"; revised fee schedules for application and issue of patents; and modifications in procedures related to the protection of patents.