U.S. Copyright Office

General information and publications.
http://lcweb.loc.gov/copyright

European Patent Office

The executive body of the European Patent Organisation.
http://www.european-patent-office.org/

National Informatics Center

Patent bibliographic database from the Government of India.
http://patinfo.nic.in/

Patent Office of the United Kingdom

Intellectual property information in the United Kingdom.
http://www.patent.gov.uk/

The State Intellectual Property Office of the People's Republic of China

Offering intellectual property and patent laws and regulations, with additional features available in Chinese.
http://www.sipo.gov.cn/

U.S. Patent & Trademark Office

Patent and trademark information in the United States, including free database searching of registered trademarks, registration information, pricing and contact phone numbers.
http://www.uspto.gov/

OHIM

The Office of Harmonization for the Internal Market (OHIM) registers the Community Trade Mark in the European Union.
http://oami.eu.int/

World Intellectual Property Organization

Responsible for the promotion of the protection of intellectual property throughout the world, and for administration of various multilateral treaties dealing with intellectual property.
http://www.wipo.int/

Canadian Patents Database

Search, retrieve and study more than 1,400,000 patent documents. From the Canadian Intellectual Property Office.
http://patents1.ic.gc.ca/

IP Australia

Government organisation providing legal information and registration material for trademarks, patents, designs and intellectual property.
http://www.ipaustralia.gov.au/