特許庁
The EPO engages in several forms of international co-operation within and outside of Europe, with other intellectual property offices, as well as with international organisations that are outside of the patent system. The EPO cooperates with the United States Patent and Trademark Office (USPTO) and the Japan Patent Office (JPO) as one of the Trilateral Patent Offices. It also works with the Japan Patent Office (JPO), the Korean Intellectual Property Office (KIPO), China's National Intellectual Property Administration (CNIPA) and the United States Patent and Trademark Office (USPTO) in a co-operation known as the "five IP offices" or IP5.