China Patent Full-text Database (CNKI Version) collects patents published by the Intellectual Property Publishing House of the State Intellectual Property Bureau, United States, Japan, United Kingdom, Germany, France, Switzerland, World Intellectual Property Organization, European Patent Office, Russia, Korea, Canada, Australia, Hong Kong and Taiwan. It contains three sub-databases, invention patent, utility model patent and design patent, which accurately reflect the latest situation of patents in China

Provides access to the bibliographic data of patents published in the previous two years by any member state of the European Patent Organisation, as well as by the European Patent Office and the World Intellectual Property Organization (WIPO). Facsimile images of patent documents are available in PDF format. Users can also choose to search Japanese patent

The FreePatentsOnline search engine is one of the most powerful, fastest and easiest patent search engines on the web. Our search allows advanced search techniques such as word stemming, proximity searching, relevancy ranking and search term weighting to help you find exactly what you are looking for. And, our account features let you organize, annotate and share documents, and Alerts let you instantly be notified when new documents of interest are published

GPSS is developed by the Intellectual Property Office of the Ministry of Economic Affairs , R.O.C. Using GPSS you can search patent documents published by Taiwan, China, Japan, Korea, Europe, the United States and WIPO on a single platform

All patents available through Google Patents come from the United States Patent and Trademark Office (USPTO)

Patent search site, you can browse full text of all the Japanese patent

Provide patent disclosure, announcement information retrieval, and can use bulletin / public number, free view of the approved image text patent announcement

United States Patent and Trademark Office cum (US Patent and Trademark Office) Web site, free of charge since 1976, the U.S. Patent Search. The site will be full to the patent 300 dpi Tagged Image File Format (TIFF) format scanning, because of its TIFF, To view the full text to download plug-software, please refer to the following Web page description：http://patft.uspto.gov/help/images.htm

The World Intellectual Property Organization (WIPO) is the United Nations agency dedicated to the use of intellectual property (patents, copyright, trademarks, designs, etc.) as a means of stimulating innovation and creativity. Can search the patents and documents freely