CIPO: Canadian Patents Database	Provides access to more than 75 years of Canadian patent descriptions and images; Compiled by the Canadian Intellectual Property Office
esp@cenet	Provides patent applications in their original language from the European Patent Office & the World Intellectual Property Organization (WIPO)
Industrial Property Digital Library (IPDL)	Provides free access to IP Gazettes of the Japan Patent Office
Intellectual Property Digital Library	Provides access to collections of patents, trademarks, industrial designs, etc.; Hosted by the World Intellectual Property Organization
International Patent Classification (IPC)	A hierarchical system for technology.
IP Australia: Patents	Provides access to patents databases on Australian patent information; By IP Australia
Patent FAQ	Answers to some frequently asked questions on intellectual property; compiled by the Intellectual Property Department, Hong Kong
SurfIP	Provides access to several worldwide patent databases including the WIPO-PCT, the European Patent Office, IPOS and the Patent Offices of Canada, Japan, Taiwan, the US and UK; Compiled by the Intellectual Property Office of Singapore (IPOS)
USPTO Web Patent Databases	Provides full-text of US patents from 1976; Compiled by US Patent & Trademark Office
State Intellectual Property Office of People Republic of China - Patent Search (中華人民共和國國家知識產權局: 專利檢索)	Full images of patents from 1980s. View with Internet Explorer; By State Intellectual Property Office of People Republic of China
Taiwan Patent Search (專利資料檢索)	By Intellectual Property Office, Ministry of Economic Affairs, Taiwan (台灣經濟部智慧財產局)