Intellectual Property Office, Ministry of Economic Affairs R.O.C. built the full text database to provide the ROC patent query system.
Patent Search and Service System of SIPO
Patent Search and Service System of SIPO” is provided by State Intellectual Property Office of the P.R.C. and China Patent Information Center with higher authority and reliability. The system collected Chinese patent information since 1985 and free download the full text of Chinese patent.
USPTO Patent Full-Text Databases
United States Patent and Trademark Office, USPTO is responsible for the administrative affairs of U.S. patent and rademark application, and also the free search services all of the United States Patent information.
Espacenet Patent search
Espacenet Patent Search (esp @ cenet)is developed for searching the issued patents granted by European Patent Office and the member states of European Union, including the European patent, the UK, Germany, France, Austria, Belgium, Italy, Finland, Denmark, Spain, Sweden, Switzerland, Ireland, Luxembourg, Cyprus and so on. In addition, it can search the information of WIPO (WIPO PCT), Patent Abstracts of Japan (PAJ) and the 30 million patent documents of more than 50 countries and regions in English written, and can browse the full text patent of more than 20 countries.
The Industrial Property Digital Library (IPDL)
The Industrial Property Digital Library (IPDL) provides the access to search the Japanese patents, and browse the full text of all Japanese patents, so that more readers has the convenient and efficient way to get the Japanese patents, trademarks and other literatures.
The Google Patent search engine can search full-text US patents. You can choose the fields and syntax including patent number, inventor name, patentee, the United States Patent Classification (USPC), International Patent Classification (IPC), filing date and issue date.